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A Comparison Between WeaklyCompressible Smoothed Particle Hydrodynamics (WCSPH) and Moving Particle SemiImplicit (MPS) Methods for 3D DamBreak Flows Int. J. Comput. Methods (IF 1.716) Pub Date : 20210108
Rubens A. Amaro Junior; LiangYee Cheng; Sergei K. BuruchenkoLagrangian particlebased methods have opened new perspectives for the investigation of complex problems with large freesurface deformation. Some wellknown particlebased methods adopted to solve nonlinear hydrodynamics problems are the smoothed parti cle hydrodynamics (SPH) and the moving particle semiimplicit (MPS). Both methods model the continuum by a system of Lagrangian particles (points)

Simulation and Optimization of Nonlinear Structures on Low Frequency Vibration and Noise of Lightweight Car Body Int. J. Comput. Methods (IF 1.716) Pub Date : 20210108
X. P. Xie; T. Chai; Q. SunAccurate models, optimization methods and improvement measures are three key issues in the design and optimization of complex structures in the field of vibration and noise. Due to the increase of passenger vehicle structure complexity and lightweight demand, nonlinear materials and structures increase obviously in the whole system. Not only different structural adhesives are used to strong body structures

ReliabilityBased Robust Design Optimization in Consideration of Manufacturing Tolerance by MultiObjective Evolutionary Optimization with Repair Algorithm Int. J. Comput. Methods (IF 1.716) Pub Date : 20210108
Gang Li; Ye Liu; Gang Zhao; Yan ZengThere are inherently various uncertainties in practical engineering, and reliabilitybased design optimization (RBDO) and robust design optimization (RDO) are two wellestablished methodologies when considering the uncertainties. Naturally, reliabilitybased robust design optimization (RBRDO) is a methodology developed recently by combining RBDO and RDO, in which the tolerances of random design variables

SteadyState Responses of Functionally Graded Piezoelectric Structures by the Coupled ThermalElectricalMechanical Inhomogeneous CellBased Smoothed Finite Element Method (CICSFEM) Int. J. Comput. Methods (IF 1.716) Pub Date : 20201228
Han Chen; Liheng Wang; Dongqi Li; Liming Zhou; Peng LiuTo accurately simulate the steadystate responses of a functionally graded piezoelectric structure (FGPS) and cure the “overlystiff” of finite element method (FEM), the coupled thermalelectricalmechanical inhomogeneous cellbased smoothed finite element method (CICSFEM) is proposed. The gradient smoothing technique is introduced into FEM and a “closetoexact” stiffness is obtained. Based on the

Regularization Strategies for Contiguous and Noncontiguous Damage Detection of Structures Int. J. Comput. Methods (IF 1.716) Pub Date : 20201228
Ziwei Luo; Ling YuRegularization strategies have attracted attention in the structural damage detection (SDD) field. However, there is lack of studies on regularization strategies for damage patterns in the existing methods. This paper proposes regularization strategies for contiguous and noncontiguous damages of structures and performs comparative studies. The objective functions are first defined to consider effects

Multiobjective Optimization of TwoDimensional Phononic Bandgap Materials and Structures Using Genetic Algorithms Int. J. Comput. Methods (IF 1.716) Pub Date : 20201228
Kepeng Qiu; Jianqiang JinIn this paper, twodimensional phononic bandgap materials are designed through multiobjective optimization using the genetic algorithm. Two cases are given. In Case I, 2D phononic crystals (PnCs) with maximum bandgap and minimum mass are optimized. The optimal results show that the thirdorder relative bandgaps become large, along with the increase in mass. In Case II, 2D local resonance phononic crystals

Overlapping MultiDomain Spectral Method for MHD Mixed Convection Slip Flow Over an Exponentially Decreasing Mainstream with Nonuniform Heat Source/Sink and Convective Boundary Conditions Int. J. Comput. Methods (IF 1.716) Pub Date : 20201228
Musawenkhosi P. Mkhatshwa; Sandile S. Motsa; Precious SibandaOverlapping multidomain bivariate spectral quasilinearization method is applied on magnetohydrodynamic mixed convection slip flow over an exponentially decreasing mainstream with convective boundary conditions and nonuniform heat source/sink effects. The method is employed in solving the transformed flow equations. The convergence properties and accuracy of the method are determined. The method gives

A Variant of ProjectionRegularization Method for IllPosed Linear Operator Equations Int. J. Comput. Methods (IF 1.716) Pub Date : 20201228
Bechouat Tahar; Boussetila Nadjib; Rebbani FaouziaIn this paper, we report on a strategy for computing the numerical approximate solution for a class of illposed operator equations in Hilbert spaces: K:E→F,Kf=g. This approach is a combination of Tikhonov regularization method and the finite rank approximation of K∗K. Finally, numerical results are given to show the effectiveness of this method.

One Identification Method of Distributed Dynamic Load Based on Modal Coordinate Transformation for Thin Plate Structure Int. J. Comput. Methods (IF 1.716) Pub Date : 20201228
Jinhui Jiang; Huangfei Kong; Hongji Yang; Jianding ChenLoad identification has long been a difficult issue for distributed load acting on structures. In this paper, the dynamic load identification technology based on the modal coordinate transformation theory is developed for dealing with identification problem of the twodimensional thin plate structure. For the distributed dynamic load acting on a plate, we decompose it with the mode functions in the

Characteristics of Earthquake Input Energy of a Subway Station Structure Based on Probability Density Evolution Method Int. J. Comput. Methods (IF 1.716) Pub Date : 20201219
Z. Q. Liu; Z. Y. Chen; H. ZhaoUnderstanding seismic energy input and dissipation mechanism is necessary for energybased seismic design of complex underground structures. Due to the intrinsic uncertainty of ground motion, stochastic methods are usually needed. In this paper, we study the seismic energy input and dissipation mechanism in an underground structure using the probability density evolution method (PDEM). It is found

Numerical Simulation of Viscous Flows Around a Surface Combatant Model at Different Drift Angles Using Overset Grids Int. J. Comput. Methods (IF 1.716) Pub Date : 20201219
Jianhua Wang; Zhenghao Liu; Decheng WanViscous flows around ship hull is of great complexity, and when the ship is advancing with drift angles, the flow field can be more complicated. In this paper, the viscous flow field around an obliquely towed surface combatant DTMB 5512 is computed using the unsteady Reynoldsaveraged Navier–Stokes (URANS) method. The numerical simulations are carried out by the inhouse CFD solver naoeFOAMSJTU,

Hydrodynamic Study and Performance Analysis of the OC4DeepCWind Platform by CFD Method Int. J. Comput. Methods (IF 1.716) Pub Date : 20201219
Yang Huang; Yuan Zhuang; Decheng Wan(1) The RAOs of OC4DeepCWind platform motions are more sensitive to the lowfrequency wave than the highfrequency wave. The nonlinear motion responses for platform heave and pitch motions are comparatively remarkable. (2) The pitch motion of OC4DeepCWind platform is much more apparently influenced by the height of center of gravity (COG) than surge and heave motions. The lower COG height within

An Improvement of Probabilistic Feasible Region Method for ReliablityBased Design Optimization Int. J. Comput. Methods (IF 1.716) Pub Date : 20201219
Zihao Wu; Zhenzhong Chen; Ge Chen; Xiaoke Li; Xuehui Gan; Shenze WangThe decoupled methods for reliabilitybased design optimization (RBDO) problems are efficient and accurate. Sequential optimization and reliability analysis (SORA) method and probabilistic feasible region (PFR) approach are typical decoupled methods. When there are multiple constraints in RBDO problem, PFR method improves the efficiency of solving this problem by establishing the PFR to reduce the

Investigation on the Aerodynamic Efficiency of Braking Spoiler for High Speed Train Applications Int. J. Comput. Methods (IF 1.716) Pub Date : 20201219
M. Vikraman; J. Bruce Ralphin Rose; S. Ganesh NatarajanThe demand for high speed rail networks is rapidly increasing in developing countries like India. One of the major constraints in the design and implementation of high speed train is the braking efficiency with minimum friction losses. Recently, the aerodynamic braking concept has received good attention and it has been incorporated for high speed bullet trains as a testing phase. The braking performance

ThreeDimensional Cartesian Grid Method for the Simulations of Flows with Shock Waves in the Domains with Varying Boundaries Int. J. Comput. Methods (IF 1.716) Pub Date : 20201217
V. V. Elesin; D. A. Sidorenko; P. S. UtkinThis paper is devoted to the development and quantitative evaluation of the properties of the numerical algorithm of the Cartesian grid method for threedimensional (3D) simulation of shockwave propagation in areas of varying shape. The detailed description of the algorithm is presented. The algorithm is relatively simple to implement and does not require solving the problem of determination of the

Numerical Simulating OpenChannel Flows with Regular and Irregular CrossSection Shapes Based on Finite Volume GodunovType Scheme Int. J. Comput. Methods (IF 1.716) Pub Date : 20201217
Xiaokang Xin; Fengpeng Bai; Kefeng LiA numerical model based on the SaintVenant equations (onedimensional shallow water equations) is proposed to simulate shallow flows in an open channel with regular and irregular crosssection shapes. The SaintVenant equations are solved by the finitevolume method based on Godunovtype framework with a modified Harten, Lax, and van Leer (HLL) approximate Riemann solver. Crosssectional area is replaced

An Optimized Explicit–Implicit TimeMarching Formulation for Dynamic Analysis Int. J. Comput. Methods (IF 1.716) Pub Date : 20201215
Delfim Soares Jr.; Matheus M. RodriguesIn this paper, an optimized approach is proposed to enhance the performance of combined explicit–implicit timedomain analyses. In this context, an entirely automated explicitimplicit adaptive timemarching procedure is discussed as well as an optimization algorithm is introduced to compute the adopted timestep value of the analysis, so that the amount of explicit and implicit elements occurring

Analysis of Cracked Body Strengthened by Adhesively Bonded Patches by BEMFEM Coupling Int. J. Comput. Methods (IF 1.716) Pub Date : 20201214
Binh V. Pham; Thai Binh Nguyen; Jaroon RungamornratThis paper presents an efficient numerical technique capable of handling the stress analysis of threedimensional cracked bodies strengthened by adhesively bonded patches. The proposed technique is implemented within the framework of the coupling of the weakly singular boundary integral equation method and the standard finite element procedure. The former is applied to efficiently treat the elastic

A Novel Robust Remeshing Finite Element Technique for Fracture Propagation Int. J. Comput. Methods (IF 1.716) Pub Date : 20201214
L. D. C. Ramalho; J. Belinha; R. D. S. G. CampilhoIn this work, a novel and robust remeshing algorithm for crack opening problems is proposed, combined with triangular plane stress finite elements. In the proposed algorithm, the crack tip efficiently propagates until a preestablished maximum crack length is achieved and the crack propagation direction is defined considering the maximum tangential stress criterion. The stress state at the crack tip

An Efficient Contact Search Algorithm for ThreeDimensional Sphere Discontinuous Deformation Analysis Int. J. Comput. Methods (IF 1.716) Pub Date : 20201214
Ganghai Huang; Yuanzhen Xu; Xiaofeng Chen; Jianjun Ma; Shu ZhangThe efficiency of contact search is one of the key factors related to the computational efficiency of threedimensional sphere discontinuous deformation analysis (3D SDDA). This paper proposes an efficient contact search algorithm, called box search algorithm (BSA), for 3D SDDA. The implementation steps and data structure for BSA are designed, with a case study being conducted to verify its efficiency

Modified Hager–Zhang conjugate gradient methods via singular value analysis for solving monotone nonlinear equations with convex constraint Int. J. Comput. Methods (IF 1.716) Pub Date : 20201121
Jamilu Sabi’u; Abdullah Shah; Mohammed Yusuf Waziri; Kabiru AhmedFollowing a recent attempt by Waziri et al. [2019] to find an appropriate choice for the nonnegative parameter of the Hager–Zhang conjugate gradient method, we have proposed two adaptive options for the Hager–Zhang nonnegative parameter by analyzing the search direction matrix. We also used the proposed parameters with the projection technique to solve convex constraint monotone equations. Furthermore

MomentBased Hybrid Polynomial Chaos Method for Interval and Random Uncertain Analysis of Periodical Composite StructuralAcoustic System with MultiScale Parameters Int. J. Comput. Methods (IF 1.716) Pub Date : 20201117
Ning Chen; Jiaojiao Chen; Shengwen YinAn interval and random momentbased arbitrary polynomial chaos method (IRMAPCM) is proposed in this paper for the analysis of periodical composite structuralacoustic systems with multiscale uncertainbutbounded parameters. In IRMAPCM, the response of structuralacoustic system is approximated as momentbased arbitrary polynomial chaos (maPC) expansion. IRMAPCM can construct the polynomial basis

Generalized Fourier’s Law and Darcy–Forchheimer Forced/Mixed Convective Flow Towards a Riga Plate with SecondOrder Velocity Slip: A Numerical Study Int. J. Comput. Methods (IF 1.716) Pub Date : 20201102
YuMing Chu; M. Ijaz Khan; Sumaira Qayym; Seifedine Kadry; Waqar A. KhanA numerical study is developed to examine the behavior of the forced/free convective flow towards a stretchable Riga plate with generalized Fourier’s law. The flow is saturated through Darcy–Forchheimer porous space and generated due to linear and secondorder velocity slip phenomena. Here, the main consideration is given to the energy equation which is modeled in the presence of generalized Fourier’s

Reflection of Longitudinal Wave in the Micropolar Elasticity with Voids Int. J. Comput. Methods (IF 1.716) Pub Date : 20201102
R. Lianngenga; J. Lalvohbika; Lalawmpuia Tochhawng; L. P. Lalduhawma; Denghmingliani ZadengBy considering no more interaction between wryness tensor and change in voids volume fraction in the materials, the reflection problem of plane longitudinal waves at a free boundary of micropolar elastic materials with voids has been investigated. We have obtained the amplitude and energy ratios of reflected waves for the incident longitudinal wave by using appropriate boundary conditions. The effect

Estimation of Thermal Contact Conductances on Irregular Interfaces Using the Generalized Integral Transform Technique and the Reciprocity Functional Method Int. J. Comput. Methods (IF 1.716) Pub Date : 20201102
Guilherme C. de Freitas; Marcelo J. ColaçoThe reciprocity functional method, associated to the Classic Integral Transform Technique (CITT), has been successfully applied, obtaining analytical solutions for the inverse heat transfer problem that seeks to estimate the thermal contact conductance (TCC) distribution on the interface of a body composed of two materials. Yet, the theoretical development upon which this approach is based is not limited

Robust Finite Difference Method for Singularly Perturbed TwoParameter Parabolic ConvectionDiffusion Problems Int. J. Comput. Methods (IF 1.716) Pub Date : 20201020
Tesfaye Aga Bullo; Gemechis File Duressa; Guy Aymard DeglaRobust finite difference method is introduced in order to solve singularly perturbed two parametric parabolic convectiondiffusion problems. In order to discretize the solution domain, Micken’s type discretization on a uniform mesh is applied and then followed by the fitted operator approach. The convergence of the method is established and observed to be firstorder convergent, but it is accelerated

Localized Lagrange Multipliers Mixed (u,p) Formulation Applied in Wind Turbine Analysis Int. J. Comput. Methods (IF 1.716) Pub Date : 20201016
Onézimo Carlos Viana Cardoso; Francisco Ilson da Silva JuniorFluid–structure analysis is frequently used to design offshore structures in a large range of engineering applications. In order to install wind turbines from the seashore, it is required that its towers must be attached at the sea floor or a system needs to be developed that allows the turbine to float. Therefore, the objective of this work is to develop a coupled structural finite element analysis

Phase Field Modeling of Brittle Fracture Based on the CellBased Smooth FEM by Considering Spectral Decomposition Int. J. Comput. Methods (IF 1.716) Pub Date : 20200919
Fan Peng; Wei Huang; Y. E. Ma; Z. Q. Zhang; Yao ZhangThe spectral decomposition of the strain tensor is an essential technique to deal with the fracture problems via phase field method, and some incorrect results may be obtained without it. A novel phase field model for brittle fracture is developed based on cellbased smooth finite element (CSFEM) and the spectral decomposition is taken into account. In order to describe the nonlinearity behaviors

Heat Transfer in Periodically Laminated Structures – Third Type Boundary Conditions Int. J. Comput. Methods (IF 1.716) Pub Date : 20200909
Ewelina PazeraThis work is about a heat transfer phenomenon in relation to the periodically laminated composite. The specific type of thermal loading, analyzed in this paper, require formulation of Robin boundary conditions. To consider a layered structure of analyzed composite, the tolerance averaging technique is used. This method allows to take into account a thickness of the layers and obtain the equations with

The Homogenized Transformation Method for the Calculation of Stress Intensity Factor in Cracked FGM Structure Int. J. Comput. Methods (IF 1.716) Pub Date : 20200909
Rong LI; Meng Yang; Bin LiangA convenient calculation method is proposed for the stress intensity factor (SIF) in cracked functionally graded material (FGM) structures. In this method, the complex computational problem for SIFs in cracked FGM plate and cylinder can be simplified as the calculation problem of empirical formulas of SIFs in cracked homogenous plate and cylinder with same loading conditions and the calculation problem

Bridge Damage Detection Using QuasiStatic Component of Moving VehicleInduced Dynamic Response Int. J. Comput. Methods (IF 1.716) Pub Date : 20200904
Zhiwei Chen; Yigui Zhou; WenYu He; Mengqi LiuThe critical signal component extracted from the bridge response caused by a moving vehicle is normally used to construct damage index for damage detection. The dynamic response of bridges subjected to moving vehicle includes several components, among which the quasistatic component reflects the inherent characteristics of the bridge. In view of this, this paper presents a bridge damage detection

Handling of Constraints in Efficient Global Optimization Int. J. Comput. Methods (IF 1.716) Pub Date : 20200904
Hu Wang; Wei Hu; Enying LiAlthough the Efficient Global Optimization (EGO) algorithm has been widely used in multidisciplinary optimization, it is still difficult to handle multiple constraint problems. In this study, to increase the accuracy of approximation, the Least Squares Support Vector Regression (LSSVR) is suggested to replace the kriging model for approximating both objective and constrained functions while the variances

Tubenet: A Special Trumpetnet for Explicit Solutions to Inverse Problems Int. J. Comput. Methods (IF 1.716) Pub Date : 20200703
G. R. Liu; S. Y. Duan; Z. M. Zhang; X. HanDifferent types of effective neural network structures have been developed, including the recurrent neural networks (RNNs), concurrent neural networks (CNNs), among others. The TrumpetNet was recently proposed by the leading author for creating twoway deepnets using physicslawbased models, such as finite element method (FEM) and smoothed FEM or SFEM. The unique feature of the TrumpetNet is the

Construction of a Preconditioner for General Elliptic Problems Using Riesz Map Int. J. Comput. Methods (IF 1.716) Pub Date : 20200630
Raghia El Hanine; Said Raghay; Hassane SadokThe current work aspires to design and study the construction of an efficient preconditioner for linear symmetric systems in a Hilbert space setting. Compliantly to Josef Málek and Zdeněk Strakoš’s work [Preconditioning and the Conjugate Gradient Method in the Context of Solving, PDEs, Vol. 1 (SIAM, USA).], we shed new light on the dependence of algebraic preconditioners with the resolution steps of

Numerical Study of Inverse Source Problem for Internal Degenerate Parabolic Equation Int. J. Comput. Methods (IF 1.716) Pub Date : 20200722
M. Alahyane; I. Boutaayamou; A. Chrifi; Y. Echarroudi; Y. OuakrimThis paper is devoted to numerical analysis of an inverse source problem in a degenerate parabolic equation. The aims of this work are to show the wellposedness of the discrete inverse problem and its convergence to the continuous one. For this, we reformulate first the encountered inverse problem to a regularized optimal control one. Then, we approximate our optimal control problem by finite element

EqualOrder Polygonal Analysis for Fluid Computation in Curved Domain Int. J. Comput. Methods (IF 1.716) Pub Date : 20200828
T. VuHuu; C. LeThanh; H. NguyenXuan; M. Abdel WahabOur research introduces a novel advanced method for fluid computation in complicated domain. It makes use of an advanced polygonal finite element applying equalorder scheme; within each element. Both velocity and pressure fields are represented by a polygonal basis shape function system. This technique is based on a combination of the equalorder mixed scheme method, the polygon finite element method

Estimation of Tumor Characteristics in a Skin Tissue by a Meshless Collocation Solver Int. J. Comput. Methods (IF 1.716) Pub Date : 20200811
ZhuoJia Fu; WenHui Chu; Min Yang; PoWei Li; ChiaMing FanThis paper aims to noninvasively estimate the sizes and locations of tumors via the surface temperature in the skin tissue. The famous 2D Pennes bioheat transfer equation is used to describe the heat transfer behavior in the skin tissue, which is solved by the recentlydeveloped meshless generalized finite difference method (GFDM) in the proposed solver. The hybrid optimization algorithm based on genetic

Finite ElementBased Analysis of BioHeat Transfer in Human Skin Burns and Afterwards Int. J. Comput. Methods (IF 1.716) Pub Date : 20200811
Abul Mukid Md. Mukaddes; Ryuji Shioya; Masao Ogino; Dipon Roy; Rezwan JaherThis research was conducted to develop the threedimensional (3D) finite element model of human skin for bioheat transfer analysis. The skin burn was analyzed using Penne’s bioheat equation, which has been adopted in many commercial finite element software. Burn injuries mostly occur due to heat transfer from hot object, hot liquids, cooking flames, and sometimes due to exposure to chemicals, electricity

Accuracy Verification of a 2D Adaptive Mesh Refinement Method Using BackwardFacing Step Flow of Low Reynolds Numbers Int. J. Comput. Methods (IF 1.716) Pub Date : 20200611
Zhenquan Li; Miao LiIdentifying centers of vortices of fluid flow accurately is one of the accuracy measures for computational methods. After verifying the accuracy of the 2D adaptive mesh refinement (AMR) method in the benchmarks of 2D liddriven cavity flow, this paper shows the accuracy verification by the benchmarks of 2D backwardfacing step flow. The AMR method refines a mesh using the numerical solution of the

Approximate Solution of Homogeneous and Nonhomogeneous 5αthOrder SpaceTime Fractional KdV Equations Int. J. Comput. Methods (IF 1.716) Pub Date : 20200630
Swapan Biswas; Uttam GhoshIn this paper, the semiinverse method is applied to derive the Lagrangian of the 5αth Korteweg de Vries equation (KdV). Then the time and space differential operators of the Lagrangian are replaced by corresponding fractional derivatives. The variation of the functional of this Lagrangian is devoted to lead the fractional Euler Lagrangian via Agrawal’s method, which gives the spacetime fractional

A Finite Pointset Method for Extended Fisher–Kolmogorov Equation Based on Mixed Formulation Int. J. Comput. Methods (IF 1.716) Pub Date : 20200626
L. Jones Tarcius Doss; N. KousalyaIn this paper, numerical solutions of the extended Fisher–Kolmogorov equation are obtained using finite pointset method. Finite pointset method is a meshless method which is a local iterative method based on the weighted least square approximation. By employing splitting technique, the extended Fisher–Kolmogorov equation is split into a two coupled system of differential equations by introducing an

A ThreeDimensional MonotonicityPreserving Modified Method of Characteristics on Unstructured Tetrahedral Meshes Int. J. Comput. Methods (IF 1.716) Pub Date : 20200626
Bassou Khouya; Mofdi ElAmrani; Mohammed SeaidSlope limiters have been widely used to eliminate nonphysical oscillations near discontinuities generated by finite volume methods for hyperbolic systems of conservation laws. In this study, we investigate the performance of these limiters as applied to threedimensional modified method of characteristics on unstructured tetrahedral meshes. The focus is on the construction of monotonicitypreserving

ReducedOrder Modeling Based on Hybrid Snapshot Simulation Int. J. Comput. Methods (IF 1.716) Pub Date : 20200626
Feng Bai; Yi WangThis paper presents a hybrid snapshot simulation methodology to accelerate the generation of highquality data for proper orthogonal decomposition (POD) and reducedorder model (ROM) development. The entire span of the snapshot simulation is divided into multiple intervals, each simulated by either highfidelity fullorder model (FOM) or fast local ROM. The simulation then alternates between FOM and

Improved Moving Least SquareBased Multiple Dimension Decomposition (MDD) Technique for Structural Reliability Analysis Int. J. Comput. Methods (IF 1.716) Pub Date : 20200625
Amit Kumar Rathi; Arunasis ChakrabortyThis paper presents the stateoftheart on different moving least square (MLS)based dimension decomposition schemes for reliability analysis and demonstrates a modified version for high fidelity applications. The aim is to improve the performance of MLSbased dimension decomposition in terms of accuracy, number of function evaluations and computational time for largedimensional problems. With this

Dimension Reduction MethodBased RBDO for Dependent Interval Variables Int. J. Comput. Methods (IF 1.716) Pub Date : 20200620
Shibshankar Dey; Kais ZamanReliabilitybased design optimization (RBDO) under epistemic uncertainty (i.e., imprecise probabilistic information), especially in the presence of dependency of input variables, is a challenging problem. In this paper, we propose a dimension reductionbased RBDO framework considering dependent interval variables, which is pursued in a purely probabilistic manner. Most probable point (MPP) based dimension

A Multiple Variational Iteration Method for Nonlinear TwoPoint Boundary Value Problems with Nonlinear Conditions Int. J. Comput. Methods (IF 1.716) Pub Date : 20200616
Asghar Ghorbani; AbdulMajid WazwazA multiple variational iteration method (VIM) is proposed to effectively solve the secondorder nonlinear twopoint boundary value problems. For problems where convergence speed of the original VIM is slow or the original method is divergent, the multiple VIM method (MVIM) presented in this paper can readily improve the rate of convergence.

A NonMatching Nodes Interface Model with Radial Interpolation Function for Simulating 2D Soil–Structure Interface Behaviors Int. J. Comput. Methods (IF 1.716) Pub Date : 20200615
Jin Gong; Degao Zou; Xianjing Kong; Yongqian Qu; Yang ZhouIn this paper, the meshless method is extended to simulate the interaction between soil and structure through 2D finite element (FE) model. The background mesh line shared by each surface of interface is introduced for Gauss points’ generation and interpolation. Thus, instead of a series of interface elements, the whole soil–structure interface can be presented by an arbitrary number of nodes with

A Neural Element Method Int. J. Comput. Methods (IF 1.716) Pub Date : 20200611
G. R. LiuMethods of artificial neural networks (ANNs) have been applied to solve various science and engineering problems. TrumpetNets and TubeNets were recently proposed by the author for creating twoway deepnets using the standard finite element method (FEM) and smoothed FEM (SFEM) as trainers. The significance of these specially configured ANNs is that the solutions to inverse problems have been, for the

Distributed Load Identification for Uncertain Structure Based on LHSGA and Improved LCurve Method Int. J. Comput. Methods (IF 1.716) Pub Date : 20200606
Haitao Zhao; Xiaowang Li; Ji’an ChenIn order to identify the upper and lower bounds of distributed force exciting on an uncertain structure, a comprehensive approach combining genetic algorithm based on Latin hypercube sampling (LHSGA) and improved Lcurve method is built up in this paper. For uncertain parameter expressed by interval form, LHSGA is presented to seeking the maximum and minimum amplitudes of distributed load in the

A Radial Basis Function–Based Ghost Cell Method for Complex Rigid or Flexible Moving Boundary Flows Int. J. Comput. Methods (IF 1.716) Pub Date : 20200604
Jianjian Xin; Zhenlei Chen; Fan Shi; Fulong Shi; Qiu JinA radial basis function (RBF)based ghost cell method is presented to simulate flows around a rigid or flexible moving hydrofoil on a Cartesian grid. A compactly supported radial basis function (CSRBF) is introduced to the ghost cell immersed boundary method to treat the complex flexible boundaries in the fluid. The results indicate that this RBF representation method can accurately track tempospatially

Dual Extreme Learning MachinesBased Spatiotemporal Modeling for Nonlinear Distributed Thermal Processes Int. J. Comput. Methods (IF 1.716) Pub Date : 20200604
Xi Jin; Hai Dong Yang; Kang Kang Xu; Cheng Jiu ZhuMany industrial thermal processes belong to distributed parameter systems (DPSs), which have two coupled nonlinear blocks. Dual least square support vector machines (LSSVM) has been proposed to model such systems. However, due to the use of two LSSVM, this method often leads to heavy computation and long learning time, which does not suit for online application. In this study, a dual extreme learning

CAD Model Segmentation Via Deep Learning Int. J. Comput. Methods (IF 1.716) Pub Date : 20200528
Antoine Van Biesbroeck; Feifei Shang; David BassirComputer aided design (CAD) models are widely employed in the current computer aided engineering or finite element analysis (FEA) systems that necessitate an optimal meshing as a function of their geometry. To this effect, the submapping method is advantageous, as it segments the CAD model into different subparts, with the aim mesh them independently. Many of the existing 3D shape segmentation methods

Comparative Studies of Surrogate Models for Response Analysis of Mistuned Bladed Disks Int. J. Comput. Methods (IF 1.716) Pub Date : 20200528
Shiyuan Deng; Jianyao Yao; Linlin Wang; Jianqiang Xin; Ning HuThe forced responses of bladed disks are highly sensitive to inevitable random mistuning. Considerable computational efforts are required for the sampling process to assess the statistical vibration properties of mistuned bladed disks. Therefore, efficient surrogate models are preferred to accelerate the process for probabilistic analysis. In this paper, four surrogate models are utilized to construct

Legendre Collocation Method to Solve the Riccati Equations with Functional Arguments Int. J. Comput. Methods (IF 1.716) Pub Date : 20200521
Şuayip Yüzbaşı; Gamze YıldırımIn this study, a method for numerically solving Riccatti type differential equations with functional arguments under the mixed condition is presented. For the method, Legendre polynomials, the solution forms and the required expressions are written in the matrix form and the collocation points are defined. Then, by using the obtained matrix relations and the collocation points, the Riccati problem

Application of Adaptive PhaseField Scaled Boundary Finite Element Method for Functionally Graded Materials Int. J. Comput. Methods (IF 1.716) Pub Date : 20200510
Aladurthi L. N. Pramod; Hirshikesh; Sundararajan Natarajan; Ean Tat OoiIn this paper, an adaptive phasefield scaled boundary finite element method for fracture in functionally graded material (FGM) is presented. The model accounts for spatial variation in the material and fracture properties. The quadtree decomposition is adopted for refinement, and the refinement is based on an error indicator evaluated directly from the solutions of the scaled boundary finite element

Predicting Stability of a Prototype Unbonded FiberReinforced Elastomeric Isolator by Finite Element Analysis Int. J. Comput. Methods (IF 1.716) Pub Date : 20200427
Thuyet Van Ngo; Anjan Dutta; Sajal Kanti DebUnbonded fiberreinforced elastomeric isolator (UFREI) is an improved device for seismic mitigation of lowrise buildings. The horizontal force — displacement behavior of UFREI is nonlinear due to rollover deformation and the horizontal stiffness is a function of both vertical load and horizontal displacement. In this paper, stability of a prototype UFREI is studied based on the dynamic response

Simulation of Fluid–Structure Interaction Problems with Thin Elastic Plate via the Coupling of Finite Element and Lattice Boltzmann Methods Int. J. Comput. Methods (IF 1.716) Pub Date : 20200331
Fei Jiang; Kangping Liao; Kazuki Matsumura; Junji Ohgi; Xian ChenA numerical framework is proposed to couple the finite element (FE) and lattice Boltzmann methods (LBM) for simulating fluid–structure interaction (FSI) problems. The LBM is used as an efficient method for solving the weaklycompressible fluid flows. The corotational FE method for beam elements is used to solve the thin plate deformation. The two methods are coupled via a directforcing immersed boundary

Calculation of the Braking Temperature on a Brake Disc of Light Passenger Aircraft Using FEM and Newcomb Models Int. J. Comput. Methods (IF 1.716) Pub Date : 20200318
Mohammed Djafri; Mostefa Bouchetara; Tawfiq Khatir; Samir Khatir; Magd Abdel WahabThe friction of two bodies in relative motion is accompanied by several phenomena such as elevation of temperature. The aim of this work is to calculate the braking temperature of the brake disc of an aircraft during the landing phase, using a calculation code based on Finite Element Method (FEM) and the analytical method of Newcomb. This investigation uses two kinds of disc — full and real disc (original

Seismic Reduction Effectiveness of Friction Pendulum Bearings in Underground Station Structures Int. J. Comput. Methods (IF 1.716) Pub Date : 20200318
Peng Jia; Zhiyi ChenSetting friction pendulum bearings (FPB) at the top of central columns may be a good strategy to reduce the stations’ seismic responses. In this paper, the FPB is simulated in a detailed manner. The seismic reduction effectiveness of the FPB is studied with the threedimensional dynamic time history analysis method. It is found that FPB can effectively reduce the maximum shearing force of the central

Matched Interface and Boundary Method for Free Vibration Analysis of Irregular Membranes Int. J. Comput. Methods (IF 1.716) Pub Date : 20200317
Zhiwei Song; Xiaoqiao He; Wei Li; De XieMatched interface and boundary (MIB) method is introduced for free vibration analysis of irregular membranes. Two distinct schemesoninterface and offinterface schemes are used to deal with the topological relations between edges of irregular domains and the Cartesian mesh lines. Different geometric shapes such as triangle and quadrilateral are dealt with by using MIB procedures. A number of examples