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A Combined Numerical and Experimental Investigation of Cycle-to-Cycle Variations in an Optically Accessible Spark-Ignition Engine Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-08-12 Hongchao Chu, Cooper Welch, Hani Elmestikawy, Shangyi Cao, Marco Davidovic, Benjamin Böhm, Andreas Dreizler, Heinz Pitsch
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Dissipation Rate Estimation in a Highly Turbulent Isotropic Flow Using 2D-PIV Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-08-13 Cameron Verwey, Madjid Birouk
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ZDES Simulation and Spectral Analysis of a High-Reynolds-Number Out-of-Equilibrium Turbulent Boundary Layer Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-08-10 Jaime Vaquero, Nicolas Renard, Sébastien Deck
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Effect of Streamline Curvature on Three-Dimensionality of Transitional Near-Wall Flow in a Linear Hydrofoil Cascade: A DNS Investigation Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-08-09 Wei Zhang
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Direct numerical simulations of turbulent channel flow over ratchet roughness Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-08-09 Angela Busse, Oleksandr Zhdanov
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Classifying Regions of High Model Error Within a Data-Driven RANS Closure: Application to Wind Turbine Wakes Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-08-09 Julia Steiner, Axelle Viré, Richard P. Dwight
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Investigation of Engine Combustion and Auto-ignition of a Multicomponent Surrogate Fuel with NTC Behavior Under Knocking Conditions Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-08-08 Magnus Kircher, Sebastian Popp, Sandro Gierth, Andrea Pati, Jonathan Schneider, Marco Günther, Christian Hasse
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Particle Image Velocimetry Measurements in Accelerated, Transonic Wake Flows Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-08-05 Judith Richter, Charalampos Alexopoulos, Bernhard Weigand
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DNS and Highly-Resolved LES of Heat and Mass Transfer in Two-Phase Counter-Current Condensing Flow Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-08-05 P. Apanasevich, D. Lucas, Y. Sato, B. Ničeno
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The Influence of Flow on Cycle-to-Cycle Variations in a Spark-Ignition Engine: A Parametric Investigation of Increasing Exhaust Gas Recirculation Levels Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-08-02 Cooper Welch, Marius Schmidt, Lars Illmann, Andreas Dreizler, Benjamin Böhm
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Surface Roughness Effects on Cavity Flows Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-07-29 Ganesh Nampelly, Ananth Sivaramakrishnan Malathi, Aditya Vaid, Nagabhushana Rao Vadlamani, Sriram Rengarajan, Konstantinos Kontis
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A coupled phase-invariant POD and DMD analysis for the characterization of in-cylinder cycle-to-cycle flow variations under different swirl conditions Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-07-29 Mengqi Liu, Fengnian Zhao, David L. S. Hung
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Effect of Vortex Generators on the Aerodynamic Performance of High-Speed Trains Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-07-28 Hao Du, Dan Zhou, Shuang Meng, Canyan Luo
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Coupling of Combustion Simulation with Atomisation and Filming Models for LES in Swirled Spray Flames Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-07-26 Nicholas C. W. Treleaven, Davide Laera, Julien Carmona, Nicolas Odier, Yann Gentil, Jerome Dombard, Guillaume Daviller, Laurent Gicquel, Thierry Poinsot
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Interactions Between Flame Topology and Turbulent Transport in High-Pressure Premixed Combustion Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-07-25 Daniel Martínez-Sanchis, Andrej Sternin, Kenneth Tagscherer, Daniel Sternin, Oskar Haidn, Martin Tajmar
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Optical Investigation of the Influence of In-cylinder Flow and Mixture Inhomogeneity on Cyclic Variability in a Direct-Injection Spark Ignition Engine Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-07-23 Judith Laichter, Sebastian A. Kaiser
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An Algebraic LCTM Model for Laminar–Turbulent Transition Prediction Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-07-22 Florian R. Menter, Alexey Matyushenko, Richard Lechner, Andrey Stabnikov, Andrey Garbaruk
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Permeability and Turbulence Over Perforated Plates Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-07-22 Haris Shahzad, Hickel Stefan, Davide Modesti
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Inner Flame Front Structures and Burning Velocities of Premixed Turbulent Planar Ammonia/Air and Methane/Air Flames Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-07-19 Parsa Tamadonfar, Shervin Karimkashi, Ossi Kaario, Ville Vuorinen
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Multicomponent Effects on the Supercritical CO2 Systems: Mixture Critical Point and Phase Separation Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-06-27 Hongyuan Zhang, Ping Yi, Suo Yang
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Drag Reduction Effect of Streamwise Traveling Wave-Like Wall Deformation with Spanwise Displacement Variation in Turbulent Channel Flow Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-06-22 Yusuke Nabae, Koji Fukagata
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A Priori Direct Numerical Simulation Analysis of the Closure of Cross-Scalar Dissipation Rate of Reaction Progress Variable and Mixture Fraction in Turbulent Stratified Flames Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-06-21 Peter Brearley, Umair Ahmed, Nilanjan Chakraborty
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Validation of the $$\gamma \text{-Re }_{\theta }$$ γ -Re θ Transition Model for Airfoils Operating in the Very Low Reynolds Number Regime Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-06-15 Manuel Carreño Ruiz, Domenic D’Ambrosio
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Representation of Surface Roughness in Hybrid Turbulence Simulations Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-06-12 Joel Varghese, Paul A. Durbin
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Optimisation of Trailing Edge Flaps on the Base Cavity of a Vehicle for Improved Performance at Yaw Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-06-07 Magnus Urquhart, Simone Sebben
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A Priori Analysis on Deep Learning of Filtered Reaction Rate Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-06-04 Junsu Shin, Maximilian Hansinger, Michael Pfitzner, Markus Klein
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Numerical and Analytical Assessment of Finite Rate Chemistry Models for LES of Turbulent Premixed Flames Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-05-23 Haochen Liu, Zifei Yin, Wenwen Xie, Bin Zhang, Jialing Le, Hong Liu
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On the Mechanism Responsible for Extreme Turbulence Intensity Generation in the Hi-Pilot Burner Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-04-21 Isaac G. Boxx, Aaron W. Skiba, Campbell D. Carter, Alberto Ceschin, Francisco E. Hernández Pérez, Hong G. Im
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Pressure Improvement on a Supercritical High-Lift Wing Using Simple and Modulated Pulse Jet Vortex Generator Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-04-12 Soheila Abdolahipour, Mahmoud Mani, Arash Shams Taleghani
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Effects of Jet-to-Jet Spacing of Air-Jet Vortex Generators in Shock-Induced Flow-Separation Control Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-04-12 Deepak Prem Ramaswamy, Anne-Marie Schreyer
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Effects of DC Electric Fields on Flickering and Acoustic Oscillations of an M-shape Premixed Flame Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-04-07 Yuan Xiong, Deanna A. Lacoste, Suk Ho Chung, Min Suk Cha
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Combustion of a Powder Layer of Methane Hydrate: The Influence of Layer Height and Air Velocity Above the Layer Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-03-29 Sergey Y. Misyura, Igor G. Donskoy, Andrey Yu. Manakov, Vladimir S. Morozov, Pavel A. Strizhak, Sergey S. Skiba, Aleksey K. Sagidullin
The paper studies the dissociation and combustion of a layer of methane hydrate powder at a forced air flow over the upper surface of the layer (the air velocity is directed parallel to the upper surface of the layer). The influence of the layer thickness and air velocity on the combustion of gas hydrate is investigated. The calculated curves for the effect of the heat transfer coefficient, external
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Robustness of the Leading Edge Vortex on Rotating Wings to Unsteady Perturbations Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-03-10 Thierry Jardin
The vast majority of research works on low aspect ratio rotating wings report that, at high angle of attack, the leading edge vortex that forms on the upper surface of the wing is stable. This ‘trick’ is used by insects and auto-rotating seeds, for example, to achieve the desirable amount of lift. Yet, a few experimental studies suggest that leading edge vortices might be unstable under similar, low
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Error Quantification for the Assessment of Data-Driven Turbulence Models Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-03-07 James Hammond, Yuri Frey Marioni, Francesco Montomoli
Data-driven turbulence modelling is becoming common practice in the field of fluid mechanics. Complex machine learning methods are applied to large high fidelity data sets in an attempt to discover relationships between mean flow features and turbulence model parameters. However, a clear discrepancy is emerging between complex models that appear to fit the high fidelity data well a priori and simpler
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Effects of Body Forces on Turbulent Kinetic Energy Transport in Premixed Flames Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-03-03 Arun Ravi Varma, Umair Ahmed, Nilanjan Chakraborty
The effects of buoyancy on turbulent premixed flames are expected to be strong due to the large changes in density between the unburned and fully burned gases. The present work utilises three-dimensional direct numerical simulations of statistically planar turbulent premixed flames under decaying turbulence to study the influence of buoyancy on the evolution of turbulent kinetic energy within the flame
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Large-Eddy Simulations of Spray a Flames Using Explicit Coupling of the Energy Equation with the FGM Database Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-02-25 Constantin Sula, Holger Grosshans, Miltiadis V. Papalexandris
This paper provides a numerical study on n-dodecane flames using Large-Eddy Simulations (LES) along with the Flamelet Generated Manifold (FGM) method for combustion modeling. The computational setup follows the Engine Combustion Network Spray A operating condition, which consists of a single-hole spray injection into a constant volume vessel. Herein we propose a novel approach for the coupling of the
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A Detailed PAH and Soot Model for Complex Fuels in CFD Applications Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-02-17 Florian Eigentler, Peter Gerlinger
A model to predict soot evolution during the combustion of complex fuels is presented. On one hand, gas phase, \(\hbox {polycyclic aromatic hydrocarbon (PAH)}\) and soot chemistry are kept large enough to cover all relevant processes in aero engines. On the other hand, the mechanisms are reduced as far as possible, to enable complex computational fluid dynamics (CFD) combustion simulations. This is
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Retraction Note: Evaluation of the Filtered Noise Turbulent Inflow Generation Method Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-02-16 Jonas Allegrini,Jan Carmeliet
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How to Design a 2D Active Grid for Dynamic Inflow Modulation Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-01-20 Wester, Tom T. B., Krauss, Johannes, Neuhaus, Lars, Hölling, Agnieszka, Gülker, Gerd, Hölling, Michael, Peinke, Joachim
In free-field operation, many aerodynamic systems are confronted with changing turbulent inflow conditions. Wind turbines are a prominent example. Here, the rotation of the rotor blades causes incoming wind gusts to result in a local change in the angle of incidence for the blade segments, which changes the effective angle of attack and can lead to dynamic non-linear effects like dynamic stall. Dynamic
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Development of 3D Pocket Tracking Algorithm from Volumetric Measured Turbulent Flames Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-01-20 Erzhuang Song, Qingchun Lei, Yeqing Chi, Wei Fan
The flame pocket formation, including reactant pocket, product pocket, soot pocket, and fluid parcel, is a common phenomenon in turbulent combustion occurred as a response of the flame to flow straining and shearing. Understanding pocket behavior is vital to study the flames in such a regime. This work addresses the research need to experimentally measure and track multiple flame pockets in 3D. For
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Effect of Unsteadiness and Scalar Dissipation Models on Flamelet Modeling of Differential Molecular Diffusion in Turbulent Non-Premixed DNS Flames Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-01-10 Han, Chao, Wang, Haifeng
Prediction of differential molecular diffusion remains a great challenge for flamelet modeling of turbulent non-premixed combustion. This work addresses this challenge through a priori and a posteriori testing of flamelet models by using DNS databases to enable a detailed examination of the model capability and limitation for the prediction of differential molecular diffusion under different combustion
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Scalar Forcing Methodology for Direct Numerical Simulations of Turbulent Stratified Mixture Combustion Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-01-10 Brearley, Peter, Ahmed, Umair, Chakraborty, Nilanjan
Scalar forcing in the context of turbulent stratified flame simulations aims to maintain the fuel-air inhomogeneity in the unburned gas. With scalar forcing, stratified flame simulations have the potential to reach a statistically stationary state with a prescribed mixture fraction distribution and root-mean-square value in the unburned gas, irrespective of the turbulence intensity. The applicability
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Role of Buoyancy Induced Vortices in a Coupled-Mode of Oscillation in Laminar and Turbulent Jet Diffusion Flames Flow Turbulence Combust. (IF 2.566) Pub Date : 2022-01-07 Nayak, Guguloth Mahesh, Kolhe, Pankaj, Balusamy, Saravanan
The unsteady effects of buoyancy-induced instabilities on jet diffusion flames are investigated experimentally under normal gravity conditions. Methane and propane are used as test fuels that are lighter and heavier than ambient air, respectively. A similar Froude (Fr) and Reynolds (Re) number relationship is realized in both hydrocarbon fuels with different tube diameters ranging from 6 to 24.2 mm
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Turbulence Intensity and Length Scale Effects on Premixed Turbulent Flame Propagation Flow Turbulence Combust. (IF 2.566) Pub Date : 2021-12-29 Trivedi, Shrey, Cant, R. S.
The effects of varying turbulence intensity and turbulence length scale on premixed turbulent flame propagation are investigated using Direct Numerical Simulation (DNS). The DNS dataset contains the results of a set of turbulent flame simulations based on separate and systematic changes in either turbulence intensity or turbulence integral length scale while keeping all other parameters constant. All
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Correction to: A New “λ2” Term for the Spalart–Allmaras Turbulence Model, Active in Axisymmetric Flows Flow Turbulence Combust. (IF 2.566) Pub Date : 2021-12-23 Philippe R. Spalart,Andrey V. Garbaruk
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Dynamic Response of a Forced Low-Swirl Premixed Flame with Acoustic Excitation Flow Turbulence Combust. (IF 2.566) Pub Date : 2021-11-27 Liu, Weijie, Xue, Ranran, Zhang, Liang, Yang, Qian, Wang, Huiru
This paper presents an experimental study on dynamic response of a forced low-swirl methane/air premixed flame with external acoustic excitation over a wide range of driving frequency. Global flame response in terms of gain and phase delay between flame intensity and incoming velocity perturbation is determined. Local flame response is investigated in detail at three typical frequencies: 55 Hz, 105 Hz
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Analysis of Flame Front Breaks Appearing in LES of Inhomogeneous Jet Flames Using Flamelets Flow Turbulence Combust. (IF 2.566) Pub Date : 2021-11-25 Soli, Alessandro, Langella, Ivan, Chen, Zhi X.
The physical mechanism leading to flame local extinction remains a key issue to be further understood. An analysis of large eddy simulation (LES) data with presumed probability density function (PDF) based closure (Chen et al., 2020, Combust. Flame, vol. 212, pp. 415) indicated the presence of localised breaks of the flame front along the stoichiometric line. These observations and their relation to
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A Hybrid Model for Turbulence and Transition, with a Locally Varying Coefficient Flow Turbulence Combust. (IF 2.566) Pub Date : 2021-11-21 Bader, Shujaut H., Yin, Zifei, Durbin, Paul A.
In this paper, a simple method to locally compute the model coefficient \(C_{DES}\) in Reddy et al. (Int J Heat Fluid Flow 50:103–113, 2014. https://doi.org/10.1016/j.ijheatfluidflow.2014.06.002) is presented. The formula for the coefficient is derived from the structural function \(B_{\beta }\) of Vreman (Phys Fluids 16(10):3670–3681, 2004. https://doi.org/10.1063/1.1785131). It, therefore, does not
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Flow Separation Dynamics in Three-Dimensional Asymmetric Diffusers Flow Turbulence Combust. (IF 2.566) Pub Date : 2021-11-19 Hajaali, Arthur, Stoesser, Thorsten
The mean and instantaneous flow separation of two different three-dimensional asymmetric diffusers is analysed using the data of large-eddy simulations. The geometry of both diffusers under investigation is based on the experimental configuration of Cherry et al. (Int J Heat Fluid Flow 29(3):803–811, 2008). The two diffusers feature similar area ratios of \(\mathrm{AR}=4.8\) and \(\mathrm{AR}=4.5\)
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On the Underlying Drag-Reduction Mechanisms of Flow-Control Strategies in a Transitional Channel Flow: Temporal Approach Flow Turbulence Combust. (IF 2.566) Pub Date : 2021-11-18 Rogge, Alexander J., Park, Jae Sung
The underlying mechanisms of three different flow-control strategies on drag reduction in a channel flow are investigated by direct numerical simulations at friction Reynolds numbers ranging from 65 to 85. These strategies include the addition of long-chain polymers, the incorporation of slip surfaces, and the application of an external body force. While it has been believed that such methods lead
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Experimental Study on Hydrodynamic Instability Characteristics of N2-Diluted n-C4H10/Air Flat Flames Flow Turbulence Combust. (IF 2.566) Pub Date : 2021-11-17 Jiang, Liqiao, Zhou, Guangzhao, Huo, Jiepeng, Gu, Chen, Chen, Xiaoli
The hydrodynamic instability characteristics of non-adiabatic N2-diluted n-butane/air flames generated on McKenna burner were investigated experimentally under atmosphere pressure. In order to capture the quantitative structure of cellular flames, planar laser induced fluorescence technology (OH-PLIF and CH2O-PLIF) was employed, as well as the chemiluminescence imaging was used to record flame morphology
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Experiment-Based Modeling of Turbulent Flames with Inhomogeneous Inlets Flow Turbulence Combust. (IF 2.566) Pub Date : 2021-11-16 Ranade, Rishikesh, Echekki, Tarek, Masri, Assaad R.
An experiment-based closure framework for turbulent combustion modeling is further validated using the Sydney piloted turbulent partially premixed flames with inhomogeneous inlets. The flames are characterized by the presence of mixed mode combustion. The framework’s closure is “trained” on multi-scalar measurements to construct thermo-chemical scalar statistics parameterized in terms of principal
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Experimental Investigation on the Propagation Process of Combustion Wave in the Annular Channel Filled with Acetylene-Air/Oxygen Mixture Flow Turbulence Combust. (IF 2.566) Pub Date : 2021-11-13 Gai, Jingchun, Qiu, Hua, Xiong, Cha, Huang, Zuohua
To understanding the initiating process in the pulse detonation curved-chamber and rotating detonation chamber, this article conducted an experimental study on the flame acceleration and the transition to detonation in the annular channel. With different equivalence ratios of acetylene-air and acetylene-oxygen as explosive mixtures, based on high-speed photography and shadow technology, the propagation
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Remarks on Energy Partitioning Control in the PITM Hybrid RANS/LES Method for the Simulation of Turbulent Flows Flow Turbulence Combust. (IF 2.566) Pub Date : 2021-11-01 Heinz, Stefan
Hybrid RANS-LES methods are supposed to provide major contributions, in particular regarding the analysis and prediction of wall-bounded turbulent flows at high Reynolds numbers. Validation data are often unavailable under these conditions, this means we need reliable hybrid RANS-LES having a proven predictive power. The latter depends on the theoretical foundations of these methods. Inspired by a
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Correction to: Techniques for Turbulence Tripping of Boundary Layers in RANS Simulations Flow Turbulence Combust. (IF 2.566) Pub Date : 2021-11-01 Narges Tabatabaei,Ricardo Vinuesa,Ramis Örlü,Philipp Schlatter
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Correlation in the Near and Far Field of Compressible Jet to Identify Noise Source Characteristics Flow Turbulence Combust. (IF 2.566) Pub Date : 2021-10-12 Nikam, Shailesh Ravindra, Sharma, Shailendra
A noise source characteristic of an unheated compressible jet is experimentally investigated for the jet with exit Mach number 0.8. Measurements of acoustic pressure fluctuations were performed in the near-field and far-field independently to identify noise source characteristics using the correlation technique. Near-field and far-field acoustic pressure fluctuations were also measured simultaneously
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Correction to: Development and Validation of Evaluation Methods for 3D Flame Propagation Speed of Turbulent Non‑premixed Edge Flames via Tomographic Chemiluminescence Flow Turbulence Combust. (IF 2.566) Pub Date : 2021-10-05 Yeqing Chi,Qingchun Lei,Erzhuang Song,Wei Fan,Yu Sha
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Techniques for Turbulence Tripping of Boundary Layers in RANS Simulations Flow Turbulence Combust. (IF 2.566) Pub Date : 2021-09-24 Tabatabaei, Narges, Vinuesa, Ricardo, Örlü, Ramis, Schlatter, Philipp
The exact placement of the laminar–turbulent transition has a significant effect on relevant characteristics of the boundary layer and aerodynamics, such as drag, heat transfer and flow separation on e.g. wings and turbine blades. Tripping, which fixes the transition position, has been a valuable aid to wind-tunnel testing during the past 70 years, because it makes the transition independent of the
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Correction: The Utilisation of Reduced Kinetics by Local Self‑Similarity Tabulation Approach in 3D Turbulent Reactive Flow Simulation with LES and TPDF Flow Turbulence Combust. (IF 2.566) Pub Date : 2021-09-23 Serdar Guryuva,Hasan Bedir
Combustion simulations with high fidelity turbulence models and detailed chemistry may suffer from high computational power requirements due to the combined cost of time-scale dissipation and small integration steps. Such a limitation can be avoided by employing a hybrid reaction mechanism reduction method called local self-similarity tabulation (LS2T). LS2T directly solves several dominant species
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Aerodynamic Study of the Pedalling of a Cyclist with a Transitional Hybrid RANS–LES Turbulence model Flow Turbulence Combust. (IF 2.566) Pub Date : 2021-09-22 Javadi, Ardalan
A transitional hybrid RANS–LES model is devised to replicate the flow around a cyclist mannequin which is positioned at the high-drag position. The transitional model of Cakmakcioglu et al. (Proc Inst Mech Eng C J Mech Eng Sci 232(21):3915–3929, 2018) which is a modified Spalart–Allmaras model, is used to simulate the transitional flow with a coarse grid close to the solid walls, while the flow is