-
A two-field formulation for surfactant transport within the algebraic volume of fluid method Comput. Fluids (IF 2.8) Pub Date : 2024-03-04 T. Antritter, T. Josyula, T. Marić, D. Bothe, P. Hachmann, B. Buck, T. Gambaryan-Roisman, P. Stephan
Surfactant transport plays an important role in many technical processes and industrial applications such as chemical reactors, microfluidics, printing and coating technology. High fidelity numerical simulations of two-phase flow phenomena reveal rich insights into the flow dynamics, heat, mass and species transport. In the present study, a two-field formulation for surfactant transport within the
-
A Boltzmann model equation synchronously involving molecular internal energy, dissociation and recombination effects for multicomponent gases Comput. Fluids (IF 2.8) Pub Date : 2024-03-04 Junlin Wu, Aoping Peng, Zhihui Li, Xinyu Jiang
On the basis of previous work, we propose a phenomenological computable Boltzmann model equation synchronously involving polyatomic molecular internal energies, dissociation and recombination effects for multicomponent gases in this paper. Here, the distribution functions of each species have nine independent variables, which are time, physical space, molecular velocity, rotational energy and vibrational
-
A high-order pseudo arc-length method with positivity-preserving flux limiter for compressible multi-medium flows Comput. Fluids (IF 2.8) Pub Date : 2024-03-01 Tianbao Ma, Kun Li, Chentao Wang
This paper proposes a high-order pseudo arc-length method (PALM) for multi-medium flows with strong robustness, stability, and positivity preservation for solving one- and two-dimensional compressible Euler equations. The main idea of the proposed scheme is to add an additional arc-length constraint equation to the original control equation and map it to the uniform orthogonal arc-length space. We
-
Partially-saturated-cells approach for conjugate heat transfer problems Comput. Fluids (IF 2.8) Pub Date : 2024-02-29 Sambit Majumder, Dipankar Narayan Basu, Ganesh Natarajan
This paper proposes a novel evolution equation for simulating conjugate heat transfer (CHT) phenomena in an immersed boundary-lattice Boltzmann (IB-LB) framework. Unlike the existing LB methodologies that reconstruct the unknown energy distribution function or add an additional source term to satisfy the interfacial boundary conditions, the proposed novel approach introduces a unified governing equation
-
A Consistent Second Order ISPH for Free Surface Flow Comput. Fluids (IF 2.8) Pub Date : 2024-02-28 Ningbo Zhang, Shiqiang Yan, Qingwei Ma, Abbas Khayyer, Xiaohu Guo, Xing Zheng
The Incompressible Smoothed Particle Hydrodynamics (ISPH) is now a popular numerical method for modelling free surface flows, in particular the breaking waves and violent wave-structures interaction. The ISPH requires the projection approach, leading to solving a pressure Poisson's equation (PPE). Although the accuracy and convergence of the numerical scheme to discretise the Laplacian operator involved
-
-
Data-driven approach for modeling Reynolds stress tensor with invariance preservation Comput. Fluids (IF 2.8) Pub Date : 2024-02-20 Xuepeng Fu, Shixiao Fu, Chang Liu, Mengmeng Zhang, Qihan Hu
-
A generating absorbing boundary condition for simulating wave interaction with maritime structures in current or at forward speed Comput. Fluids (IF 2.8) Pub Date : 2024-02-16 X. Chang, P.R. Wellens
The lack of suitable boundary conditions in practical surface wave simulations with maritime structures in current or at forward speed may cause energy in the computational domain to accumulate due to spurious wave reflection. The common way to prevent wave reflection is to use passive wave absorbers, such as damping zones or relaxation zones, which requires larger domains at the cost of computational
-
An efficient thermal lattice Boltzmann method for simulating three-dimensional liquid–vapor phase change Comput. Fluids (IF 2.8) Pub Date : 2024-02-15 Jiangxu Huang, Lei Wang, Xuguang Yang
In this paper, a multiple-relaxation-time lattice Boltzmann (LB) approach is developed for the simulation of three-dimensional (3D) liquid–vapor phase change based on the pseudopotential model. In contrast to some existing 3D thermal LB models for liquid–vapor phase change, the present approach has two advantages: for one thing, some gradient terms, such as the gradient of volumetric heat capacity
-
Eulerian finite volume method using Lagrangian markers with reference map for incompressible fluid–structure interaction problems Comput. Fluids (IF 2.8) Pub Date : 2024-02-15 Koji Nishiguchi, Tokimasa Shimada, Christian Peco, Keito Kondo, Shigenobu Okazawa, Makoto Tsubokura
We propose a monolithic fluid–structure interaction (FSI) method that presents the advantages of both the reference map technique (RMT) and the Lagrangian Markers approach on a unified, cell-centered finite volume Eulerian framework. Full Eulerian methods that use a Cartesian mesh are attractive for FSI problems that require large-scale computing and involve complex geometries and large solid deformations
-
Study of a qualitative model for combustion waves: Flames, detonations, and deflagration-to-detonation transition Comput. Fluids (IF 2.8) Pub Date : 2024-02-15 Andrei Yu. Goldin, Shamil M. Magomedov, Luiz M. Faria, Aslan R. Kasimov
We analyze a simplified one-dimensional model of combustion that includes the effects of compressibility, diffusion, heat conduction, viscosity, and exothermic heat release. Using numerical simulations, we show that the model predicts both detonation-like and deflagration-like traveling waves. Importantly, it also predicts spontaneous transition from deflagration to detonation in the problem of hot-spot
-
The harmonic linearized Navier–Stokes equations for transition prediction in three-dimensional flows Comput. Fluids (IF 2.8) Pub Date : 2024-02-10 Pedro Paredes, Meelan Choudhari, Mark H. Carpenter, Fei Li
The conventional method to predict the onset of laminar-turbulent transition in convectively unstable boundary-layer flows is based on the logarithmic amplification ratio, the N-factor, of the linear instability waves. To calculate the N-factor, the flow variables are decomposed into a laminar basic state solution and the linear disturbances, which are assumed to be harmonic in time. The most commonly
-
Well-balanced finite difference WENO-AO scheme for rotating shallow water equations with Coriolis force Comput. Fluids (IF 2.8) Pub Date : 2024-02-10 Nan Zhang
We develop an efficient conservative high-order well-balanced finite difference weighted essentially nonoscillatory (WENO) scheme for solving the rotating shallow water equations (SWEs) with Coriolis force. The scheme utilizes a well-balanced reconstruction proposed by Xing and Shu for the SWEs in [Xing and Shu, J. Comput. Phys., 208 (2005), pp. 206-227], combining with the idea of treating rotation
-
Evaluating approaches to accurately compute electro-vortex flows in liquid metal electrodes Comput. Fluids (IF 2.8) Pub Date : 2024-02-08 Swapnil Soni, Avishek Ranjan, Trushar B. Gohil
We quantitatively evaluate three approaches commonly used in the literature to simulate electro-vortex flow (EVF) in the finite volume framework of OpenFOAM. These approaches differ in the method of computing magnetic field () due to an applied current density (). The first approach involves the use of Biot–Savart law whereas the latter two approaches involve the magnetic vector potential, , with and
-
Meshfree one-fluid modeling of liquid–vapor phase transitions Comput. Fluids (IF 2.8) Pub Date : 2024-02-08 Pratik Suchde, Heinrich Kraus, Benjamin Bock-Marbach, Jörg Kuhnert
We introduce a meshfree collocation framework to model the phase change from liquid to vapor at or above the boiling point. While typical vaporization or boiling simulations focus on the vaporization from the bulk of the fluid, here we include the possibility of vaporization from the free surface, when a moving fluid comes into contact with a superheated surface. We present a continuum, one-fluid approach
-
Output-based mesh adaptation for high-speed flows Comput. Fluids (IF 2.8) Pub Date : 2024-02-08 James G. Coder, Benjamin L.S. Couchman, Marshall C. Galbraith, Steven R. Allmaras, Nick Wyman
High-speed Computational Fluid Dynamics calculations often rely on structured meshes in order to facilitate aligning the mesh with shocks either manually or via some semi-automated process. The shock alignment of the mesh is often considered critical in order to obtain sufficiently accurate outputs such as integrated surface heat transfer. However, creating shock-aligned structured meshes with complex
-
A conservative sharp interface method for incompressible viscous two-phase flows with topology changes and large density ratio Comput. Fluids (IF 2.8) Pub Date : 2024-02-08 Bo Pang, Yi Ren, Yi Shen, Hao-Ran Liu, Hang Ding
Topology change of interfaces often leads to unresolved interface structures such as tiny droplets/bubbles, which requires the regularization of the order parameter and consequently causes artificial modification of volume fraction of the fluids. This could give rise to unphysical oscillation of pressure and cause the failure of computation, in particular for two-phase flows involving large density
-
A review of Hyperloop aerodynamics Comput. Fluids (IF 2.8) Pub Date : 2024-02-07 Alex J. Lang, David P. Connolly, Gregory de Boer, Shahrokh Shahpar, Benjamin Hinchliffe, Carl A. Gilkeson
Evacuated tube transport, also known as Hyperloop, is a proposed mode of ground transport that uses depressurised tubes to transport passengers and cargo at high-speeds. The aerodynamic flow regime of a Hyperloop system combines the characteristics of low Reynolds number, high Mach number, and confined/choked flow. This makes it unique compared to more commonly studied aerodynamic problems, and as
-
Pseudo-spectral solver versus grid-based solver: A quantitative accuracy test using GMHD3D and PLUTO4.4 Comput. Fluids (IF 2.8) Pub Date : 2024-02-07 Shishir Biswas, Rajaraman Ganesh
We provide a thorough comparison of the GMHD3D code and the PLUTO4.4 code for both two- and three-dimensional hydrodynamic and magnetohydrodynamic problems. The open-source finite-volume solver PLUTO4.4 and the in-house developed pseudo-spectral multi-GPU solver GMHD3D both can be used to model the dynamics and turbulent motions of astrophysical plasmas. Although GMHD3D and PLUTO4.4 utilize different
-
An all-Mach consistent numerical scheme for simulation of compressible multi-component fluids including surface tension, cavitation, turbulence modeling and interface sharpening on compact stencils Comput. Fluids (IF 2.8) Pub Date : 2024-02-06 Yu Jiao, Steffen J. Schmidt, Nikolaus A. Adams
We present a numerical scheme valid in the range of highly to weakly compressible flows using a single-fluid four equation approach together with multi-component thermodynamic models. The approach can easily be included into existing finite volume methods on compact stencils and enables handling of compressibility of all involved phases including surface tension, cavitation and viscous effects. The
-
Numerical investigation of nonlinear aeroelastic characteristics of a supersonic drag-reduction spike Comput. Fluids (IF 2.8) Pub Date : 2024-02-06 Kun Ye, Shubao Chen, Zhengyin Ye
The drag-reduction spike is widely employed in the testing of hypersonic vehicles owing to its remarkable ability to reduce drag and heat. Further investigation into the aeroelastic characteristics and mechanisms of the drag-reduction spike will offer a valuable reference for the refined design of its aerodynamics and structure. In this paper, based on the in-house high-order accurate CFD/CSD coupling
-
Two-particle diffusion in homogeneous turbulence with stable stratification by linear RDT spectral space analysis and application of a simplified model Comput. Fluids (IF 2.8) Pub Date : 2024-02-05 Racha Nefzi, Taieb Lili, Brahim Ben Beya
This paper investigates the numerical study of relative two-particle diffusion in homogeneous stably stratified turbulence. The focus is on obtaining components of tensors and which are associated with one-particle and two-particle diffusion, respectively. This is achieved by utilizing Lagrangian two-time velocity correlations for both individual particles and two particles initially separated by
-
A robust numerical scheme based on auxiliary interface variables and monotone-preserving reconstructions for two-layer shallow water equations with wet–dry fronts Comput. Fluids (IF 2.8) Pub Date : 2024-02-04 Jian Dong, Xu Qian
This work aims to propose a well-balanced and positivity-preserving numerical scheme for the two-dimensional two-layer shallow water equations with a nonflat bottom topography on uniform meshes. One difficulty is to preserve the water at rest when the computational domain contains wet–dry fronts. It is highly nontrivial. Another difficulty in solving the system is to deal with the nonconservative product
-
Computational modelling of compressible nonisothermal viscoelastic fluids Comput. Fluids (IF 2.8) Pub Date : 2024-01-30 A.T. Mackay, T.N. Phillips
The prediction of compressible nonisothermal flows of viscoelastic fluids is important in many industrial processes. Until relatively recently, there was a lack of tractable thermodynamically consistent mathematical models for this class of flows. In this paper a stabilised finite element scheme is presented for the models developed by the authors Mackay and Phillips (2019) which incorporates compressibility
-
Wavelet-based adaptive implicit large-eddy simulation of turbulent channel flow Comput. Fluids (IF 2.8) Pub Date : 2024-02-03 Giuliano De Stefano
The wavelet-based adaptive implicit large-eddy simulation approach to computational modeling of turbulent flows is introduced. The direct solution of the wavelet-filtered compressible Navier–Stokes equations is attained without employing any explicit modeling procedure for the unclosed terms. Instead, the dissipative properties of the numerical method using adaptive wavelet collocation are exploited
-
-
Lattice Boltzmann method with artificial bulk viscosity using a neural collision operator Comput. Fluids (IF 2.8) Pub Date : 2024-02-02 Jan Tobias Horstmann, Mario Christopher Bedrunka, Holger Foysi
The lattice Boltzmann method (LBM) stands apart from conventional macroscopic approaches due to its low numerical dissipation and reduced computational cost, attributed to a simple streaming and local collision step. While this property makes the method particularly attractive for applications such as direct noise computation, it also renders the method highly susceptible to instabilities. A vast body
-
Symmetrized Generalized and Simplified Bernoulli-trials Collision Schemes in DSMC Comput. Fluids (IF 2.8) Pub Date : 2024-01-26 Maryam Javani, Ehsan Roohi, Stefan Stefanov
The collision process is crucial in the direct simulation Monte Carlo (DSMC) method as it considers the fundamental aspects of the Boltzmann or Kac stochastic equation. This article aims to facilitate the choice of collision pairs by using a symmetrization of the pair selection process of collisions. On the base of the recently created symmetrized simplified Bernoulli-trials scheme, we applied our
-
The effect of basis polynomial degree on the performance of compressible flow simulations employing a split-form DG method Comput. Fluids (IF 2.8) Pub Date : 2024-01-26 Vachan D. Potluri, Bhalchandra P. Puranik, Kowsik V.R. Bodi
High order methods have garnered significant interest recently for simulating compressible flows due to their low dissipation nature. In this regard, the use of discontinuous Galerkin method has been actively pursued due to the advantages ensuing from its compact interpolation. However, these methods generally require employing a limiter for stable computation of supersonic compressible flows that
-
Aeroacoustic assessment of a rectilinear cascade with leading edge serrations: predictions and measurements Comput. Fluids (IF 2.8) Pub Date : 2024-01-25 M. Buszyk, C. Polacsek, T. Le Garrec, R. Barrier, V. Clair, E. Salze, C. Bailly
This study aims at evaluating previously designed leading edge serrations for the turbulence-cascade interaction noise reduction on a rectilinear cascade. Low and high-fidelity methodologies have been investigated and are compared to experimental data issued from a cascade test rig mounted in an anechoic wind tunnel. These methods include mean flow simulations for aerodynamic performance analysis,
-
CPU and GPU parallel efficiency of ARM based single board computing cluster for CFD applications Comput. Fluids (IF 2.8) Pub Date : 2024-01-20 Bastien Di Pierro, Sarah Hank
This paper examines the parallel efficiency of an ARM-based single board computing cluster made of 16 Raspberry Pi 4 and 8 Nvidia Jetson Nano Single Board Computer, considering both CPU and GPU parallel implementation of CFD applications. It is found that the parallelization scales up to 16 Raspberry Pi 4 and 8 Nvidia Jetson Nano (maximum available on the current cluster). Moreover, it is shown that
-
Fully-discrete WENO via solution formula method for hyperbolic conservation laws Comput. Fluids (IF 2.8) Pub Date : 2024-01-20 Tong Zhou, Haitao Dong
Different from the spatial semi-discrete WENO schemes based on RK method in time, this paper presents a fully-discrete scheme with consistent high order in time and space based on solution formula method. Analyzing the error composition of the framework, we obtain two core steps of discretization for constructing high-order schemes: initial value reconstruction and flux reconstruction. During the reconstruction
-
The effect of cross-sectional geometry on the high-speed narrow open channel flows: An updated Reynolds stress model study Comput. Fluids (IF 2.8) Pub Date : 2024-01-18 Subhojit Kadia, Leif Lia, Ismail Albayrak, Elena Pummer
This numerical study investigates the effect of the channel cross-sectional geometries, namely archway, circular, and horseshoe on the mean velocity fields, secondary currents, turbulence characteristics, and bed shear stress distributions in supercritical narrow open channel flows. Six uniform flow simulations, combining two filling ratios comparable to sediment bypass tunnel flows, were performed
-
Coarse grained simulation and dynamic bridging for turbulent mixing predictions Comput. Fluids (IF 2.8) Pub Date : 2024-01-19 Fernando F. Grinstein
We revisit coarse-grained simulation strategies for turbulent material mixing driven by shocked/accelerated material interfaces, based on LANL’s Radiation Adaptive Grid Eulerian (xRAGE)–Large-Eddy Simulation (LES), and dynamic bridging xRAGE LES and Besnard–Harlow–Rauenzahn Reynolds-Averaged-Navier–Stokes using Low-Mach-Corrected hydrodynamics. Tests of the new simulation paradigms demonstrate improved
-
Mixtures of phase transforming fluids and gases: Phase field model and stabilized isogeometric discretization Comput. Fluids (IF 2.8) Pub Date : 2024-01-14 Saikat Mukherjee, Hector Gomez
Liquid–vapor phase change in the presence of non-condensable gases is a classical problem, which continues to challenge continuum modeling. Here, we propose a new model based on the phase field method, which describes the dynamics of the non-condensable gas, phase change and flow simultaneously. The model is built by extending van der Waals and Korteweg’s theory for phase-transforming mixtures. The
-
Numerical analysis of air–water two-phase upflow in artificial upwelling of deep ocean water by airlift pump Comput. Fluids (IF 2.8) Pub Date : 2024-01-11 Un-Ryong Rim
Artificial upwelling by the use of airlift pump is regarded as an effective way in utilizing deep ocean water and actualizing ocean fertilization. This paper focuses on numerical analysis of steady air–water two-phase flow in a vertical pipe of an airlift system based on one-dimensional multi-fluid model. The depth distributions of 6 physical quantities such as volumetric fractions and axial velocities
-
ASYMPTOTIC BOUNDARY CONDITION FOR NUMERICAL MODELING OF WAVE PACKETS IN A SUPERSONIC BOUNDARY LAYER Comput. Fluids (IF 2.8) Pub Date : 2024-01-15 P.V. Chuvakhov, A.V. Fedorov
Within the framework of linear stability theory, a simple non-stationary boundary condition is developed to simulate the far-field asymptotic behavior of linear wave packets propagating in a compressible boundary layer. This condition allows us to skip the linear stage of instability evolution in direct numerical simulations (DNS) of laminar-turbulent transition. It is also suggested to perform numerical
-
A coarse grid approach for single bubble boiling simulations with the volume of fluid method Comput. Fluids (IF 2.8) Pub Date : 2024-01-15 Lubomir Bures, Mattia Bucci, Yohei Sato, Matteo Bucci
Direct Numerical Simulation (DNS) of boiling flows requires a substantial number of grid points to precisely resolve the thermal boundary layer surrounding the phase interface. This resolution is vital for accurate calculation of the temperature gradient, which directly influences the mass transfer rate. However, the thermal boundary layer is typically three orders of magnitude smaller than the bubble's
-
An accurate and scalable direction-splitting solver for flows laden with non-spherical rigid bodies—Part 2: Moving rigid bodies Comput. Fluids (IF 2.8) Pub Date : 2024-01-12 Aashish Goyal, Anthony Wachs
The Direction Splitting algorithm is a computational method that facilitates the solution of the Navier–Stokes equation by decomposing a multi-dimensional Poisson equation into a series of one-dimensional equations. This approach allows for efficient and scalable numerical computations. The incorporation of rigid bodies in the computational domain is made possible by modifying the diffusion and divergence
-
Staggered grids for multidimensional multiscale modelling Comput. Fluids (IF 2.8) Pub Date : 2024-01-10 J. Divahar, A.J. Roberts, Trent W. Mattner, J.E. Bunder, Ioannis G. Kevrekidis
For high accuracy and to improve simulated wave characteristics, this article extends the concept of staggered grids to novel multidimensional multiscale modelling enabling efficient computation on sparse patches. Computational schemes for wave-like systems with small dissipation are often inaccurate and unstable due to truncation errors and numerical roundoff errors. Hence simulations of wave-like
-
-
A portable coding strategy to exploit vectorization on combustion simulations Comput. Fluids (IF 2.8) Pub Date : 2024-01-04 Fabio Banchelli, Guillermo Oyarzun, Marta Garcia-Gasulla, Filippo Mantovani, Ambrus Both, Guillaume Houzeaux, Daniel Mira
The complexity of combustion simulations demands the latest high-performance computing tools to accelerate its time-to-solution results. A current trend on HPC systems is the utilization of CPUs with SIMD or vector extensions to exploit data parallelism. Our work proposes a strategy to improve the automatic vectorization of finite-element-based scientific codes. The approach applies a parametric configuration
-
An approach to determine the solid volume fraction near solid boundaries for partially saturated method within the lattice Boltzmann method Comput. Fluids (IF 2.8) Pub Date : 2023-12-29 Xiang Li, Huaqing Ma, Zengsheng Mei, Du Zhou, Yongzhi Zhao
Within the LBM (Lattice Boltzmann Method), PSM (Partially Saturated Method) is a quite straightforward approach for dealing with solid boundaries. Additionally, PSM also has the advantages of mass-conserving and no fresh node problem. There have been numerous successful implementations of PSM in processing the fluid-solid interactions in previous investigations. In PSM, calculating the solid volume
-
The voxelized photon Monte Carlo method for hypersonic radiation modeling Comput. Fluids (IF 2.8) Pub Date : 2023-12-29 Sara J. Swenson, Brian M. Argrow, Craig P. Turansky
A novel method of solving for radiative energy transfer at hypersonic speeds, the voxelized photon Monte Carlo (voxPMC) method, is presented. The voxPMC method is implemented in the Discrete Adaptive Radiative Transport (DART) code and results are given for radiative heat transfer of Mach 9.6 flow over a cylinder. Simulation parameters for this method were tuned to determine requirements for accurate
-
Acceleration of complex high-performance computing ensemble simulations with super-resolution-based subfilter models Comput. Fluids (IF 2.8) Pub Date : 2023-12-27 Mathis Bode, Jens Henrik Göbbert
Direct numerical simulation (DNS) of fluid flow problems has been one of the most important applications of high-performance computing (HPC) in the last decades. For example, turbulent flows require the simultaneous resolution of multiple spatial and temporal scales as all scales are coupled, resulting in very large simulations with enormous degrees of freedom. Another example is reactive flows, which
-
Flux vector splitting schemes applied to a conservative 1D blood flow model with transport for arteries and veins Comput. Fluids (IF 2.8) Pub Date : 2023-12-26 Alessandra Spilimbergo, Eleuterio F. Toro, Annunziato Siviglia, Lucas O. Müller
We present novel flux splitting-based numerical schemes for the 1D blood flow equations with an advection equation for a passive scalar, considering tube laws that allow to model blood flow in arteries and veins. Our schemes are inspired by the original flux vector splitting approach of Toro and Vázquez-Cendón (2012) and represent an extension of the work proposed by Toro et al. (2024), which addressed
-
Coupling of smoothed particle hydrodynamics and finite volume method for electrohydrodynamic droplet deformation simulation Comput. Fluids (IF 2.8) Pub Date : 2023-12-18 Yali Zhao, Liming Huo, Weiwei Xu, Haowei Zhu
In the numerical simulation of droplet electrohydrodynamic deformation, the grid-based method is difficult to handle the large topological deformation of the droplet interface, while the meshless method is challenging in the enforcement of boundary conditions. Therefore, a coupling method of the smoothed particle hydrodynamics (SPH) method and the finite volume method (FVM) is developed in this paper
-
Physics-informed neural networks for parametric compressible Euler equations Comput. Fluids (IF 2.8) Pub Date : 2023-12-21 Simon Wassing, Stefan Langer, Philipp Bekemeyer
The numerical approximation of solutions to the compressible Euler and Navier–Stokes equations is a crucial but challenging task with relevance in various fields of science and engineering. Recently, methods from deep learning have been successfully employed for solving partial differential equations by incorporating the equations into a loss function that is minimized during the training of a neural
-
High speed flows with particles on demand: Boundary conditions Comput. Fluids (IF 2.8) Pub Date : 2023-12-18 Abhimanyu Bhadauria, Ilya Karlin
The particles on demand (PonD) method is a new kinetic theory model that allows for simulation of high speed compressible flows. While the standard lattice-Boltzmann method is limited by a fixed reference frame, significantly reducing the range of Mach numbers, PonD takes advantage of adaptive reference frames to get rid of the restrictions of standard LB and is able to simulate flows at high speeds
-
Discontinuous Galerkin methods for axisymmetric flows Comput. Fluids (IF 2.8) Pub Date : 2023-12-12 Anthony Bosco, Vincent Perrier
In this article, high order discontinuous Galerkin methods for axisymmetric flows are developed. A first work is performed to put the equations in a so called canonical form to gather terms of similar nature, and also for ensuring the three dimensional conservativity. Then the numerical scheme is developed. Instead of relying on the strong axisymmetric formulation, we rely on the θ-averaged form of
-
Effects of thermochemical non-equilibrium in the boundary layer of an ablative thermal protection system: A state-to-state approach Comput. Fluids (IF 2.8) Pub Date : 2023-12-16 Francesco Bonelli, Davide Ninni, Lucia Daniela Pietanza, Gianpiero Colonna, Bernd Helber, Thierry E. Magin, Giuseppe Pascazio
In the era of space exploration, one of the fundamental goals is the investigation of the atmospheric re-entry of a space vehicle, which undergoes tremendous heat load due to the shock waves forming in front of its thermal shield. In the view of heat mitigation, ablative materials are employed for the design of the Thermal Protection System (TPS) of most of the modern vehicles. Such materials essentially
-
Artificial compressibility method for high-pressure transcritical fluids at low Mach numbers Comput. Fluids (IF 2.8) Pub Date : 2023-12-16 Ahmed Abdellatif, Jordi Ventosa-Molina, Joan Grau, Ricardo Torres, Lluís Jofre
Supercritical fluids possess unique properties that makes them relevant in various scientific and engineering applications. However, the experimental investigation of these fluids is challenging due to the high pressures involved and their complex thermophysical behavior. To overcome these limitations, computational researchers employ scale-resolving methods, such as direct numerical simulation and
-
An R-adaptive algorithm based on self-organizing maps for solving incompressible flows with high-order discontinuous Galerkin methods Comput. Fluids (IF 2.8) Pub Date : 2023-12-16 Wei An, Jian Yu, Hongqiang Lyu, Xuejun Liu
Mesh quality is critical for the numerical accuracy of CFD (Computational Fluid Dynamics). Although various techniques have been developed to improve mesh applicability to complex flows, r-adaptive methods have received far too little attention. This paper introduces an r-adaptive algorithm based on the self-organizing maps (SOM) of Kohonen and applies it to unsteady CFD applications using the Discontinuous
-
Assessment of immersed boundary methods for hypersonic flows with gas–surface interactions Comput. Fluids (IF 2.8) Pub Date : 2023-12-14 Ata Onur Başkaya, Michele Capriati, Alessandro Turchi, Thierry Magin, Stefan Hickel
-
Effects of free tip shape and aspect ratio on flow around a finite cylinder with two free tips at subcritical Reynolds numbers Comput. Fluids (IF 2.8) Pub Date : 2023-12-10 Qiliang Liu, Shuguang Gong, Guilan Xie, Haishan Lu, Zhijian Zuo
The influence of free tip shape and aspect ratio (AR) on the flow past a finite circular cylinder with two free tips is experimentally and numerically investigated over a range of Reynolds numbers (Re) from 0.69×104 to 6.16×104. Cylinders with two flat, radiused, hemispherical, and conical tips are considered, with AR ranging from 10 to 30. Laboratory experiments are performed in a closed-return wind
-
A machine learning based acceleration of segregated pressure correction algorithms for incompressible fluid flow Comput. Fluids (IF 2.8) Pub Date : 2023-12-08 Yangyu Deng, Di Zhang, Ze Cao, Yakun Liu
Segregated pressure correction algorithms are widely used in the simulation of steady-state incompressible fluid flow. However, these traditional solution algorithms usually require high computational resources for design optimization problems. To resolve this issue, we propose an advanced tree-based Machine Learning (ML) model named Extremely Randomized Trees (ERT) for speeding up the convergence
-
Droplet splitting on chemically heterogeneous surface: A 3D lattice Boltzmann study Comput. Fluids (IF 2.8) Pub Date : 2023-12-12 Bing He, Quanying Li, Yongcai Pan, Binghai Wen
The uniform splitting of droplets on heterogeneous surfaces without external stimuli has gained increasing attention due to its wide and flexible applications. To precisely control and predict the droplet splitting, the 3D multiphase lattice Boltzmann model (LBM) is used to study the mechanism of the impact splitting on a hydrophilic surface with a superhydrophobic strip. A parallel implementation
-
Ensemble fluid simulations on quantum computers Comput. Fluids (IF 2.8) Pub Date : 2023-12-09 Sauro Succi, Wael Itani, Claudio Sanavio, Katepalli R. Sreenivasan, René Steijl
We discuss the viability of ensemble simulations of fluid flows on quantum computers. The basic idea is to formulate a functional Liouville equation for the probability distribution of the flow field configuration and recognize that, due to its linearity, such an equation is in principle more amenable to quantum computing than the dynamic equations of fluid motion. After suitable marginalization and
-
Role of the deviation motion on the aerodynamic performance of a mosquito wing in hover Comput. Fluids (IF 2.8) Pub Date : 2023-12-08 Hyunwoo Jung, Sehyeong Oh, Haecheon Choi
The deviation angles during wing flapping motions are generally small for many insects and are known to have insignificant or even detrimental effects on the flight performance. Unlike many other insects, a mosquito hovers with a small sweeping amplitude but relatively large deviation angles. Thus, we investigate the effect of a deviation motion (‘figure-eight’ motion measured by Bomphrey et al. (2017))
-
A novel flux splitting based on wave-particle splitting for ideal magnetohydrodynamics Comput. Fluids (IF 2.8) Pub Date : 2023-12-08 Shiyuan Zhang
A novel flux splitting method based on wave-particle splitting is developed for one-dimensional ideal magnetohydrodynamics. While ideal magnetohydrodynamics (MHD) equations are non-convex with non-homogeneous flux as opposed to their hydrodynamic counterparts, the present flux splitting methods cannot develop Riemann solver. The proposed approach based on wave-particle method referred as Advection