Article
Computer Science, Interdisciplinary Applications
Maoqiang Jiang, Jing Li, Zhaohui Liu
Summary: This study presents an efficient and parallel fully resolved direct numerical simulation (FR-DNS) method for large-scale 2D and 3D suspension flows. The study combines the boundary-thickening direct forcing immersed boundary method (BTDF-IBM) and incompressible lattice Boltzmann method (LBM) to achieve accurate and realistic simulations. The results show promising parallel speedup and efficiency, highlighting the potential of this method in various industrial applications.
COMPUTERS & FLUIDS
(2022)
Article
Engineering, Chemical
Shenxu Qin, Maoqiang Jiang, Kuang Ma, Jin Su, Zhaohui Liu
Summary: An efficient immersed boundary-lattice Boltzmann method (IB-LBM) is proposed for fully resolved simulations of suspended solid particles in viscoelastic flows. The method is validated and applied to various scenarios, demonstrating its capability in studying the complex behaviors of viscoelastic particle suspensions.
Article
Mathematics, Applied
Rodrigo S. Romanus, Alan Lugarini, Admilson T. Franco
Summary: The paper introduces a domain transferring scheme combined with a high-quality algorithm for simulating particle motion in a large domain, disclosing details of mesh generation for ellipsoidal particles and internal mass compensation strategy. The numerical model accurately describes particle rotation and terminal velocity, showing good agreement with analytical results.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2021)
Article
Thermodynamics
Maoqiang Jiang, Kuang Ma, Jing Li, Zhaohui Liu
Summary: A lattice-Boltzmann model coupled with boundary method is proposed for simulating the combustion of a single char particle. The model considers real varying thermodynamic and transport properties and uses a boundary-thickening based direct forcing-immersed boundary method for implementing boundary conditions. Different reactions are adopted to describe the combustion process. The simulation results show good agreement with previous experimental and numerical results.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Computer Science, Interdisciplinary Applications
Alberto Vela-Martin, Miguel P. Encinar, Adrian Garcia-Gutierrez, Javier Jimenez
Summary: Wall-bounded flows are crucial in numerous applications and have been extensively studied, but the dynamics of logarithmic and outer regions remain controversial. This study presents a low-storage method for time-resolved databases, utilizing filtered flow fields to reduce storage costs. By relaxing numerical resolution and leveraging GPU co-processors with a high-resolution hybrid CUDA-MPI code, significant speed-up in computing is achieved to capture large-scale dynamics effectively.
JOURNAL OF COMPUTATIONAL SCIENCE
(2021)
Article
Mathematics, Interdisciplinary Applications
Sambit Majumder, Arnab Ghosh, Dipankar Narayan Basu, Ganesh Natarajan
Summary: In this study, we investigate the accuracy and robustness of our in-house OpenMP parallelized direct-forcing immersed boundary-lattice Boltzmann (DF-IB-LB) solver. We find that the solver exhibits first and second-order spatial accuracy for velocity and pressure errors, respectively, for generic moving boundary problems. The method is Galilean invariant, and errors in discrete conservation and spurious force oscillations decay linearly and superlinearly, respectively, with grid refinement.
COMPUTATIONAL PARTICLE MECHANICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Xiang Zhao, Zhen Chen, Liming Yang, Ningyu Liu, Chang Shu
Summary: In this study, the original boundary condition-enforced immersed boundary method is improved with the use of conjugate gradient technique and explicit technique for simulating incompressible flows with moving boundaries. The computational efficiency of the improved IBM is demonstrated to be higher than other popular IBM methods, especially the explicit technique-based IBM with a linear computational complexity. Coupled with D1Q4 lattice Boltzmann flux solver, the IBM with conjugate gradient technique and explicit technique successfully simulate two-dimensional and three-dimensional flows with second order accuracy in space.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Engineering, Marine
Fei Yang, Xin Gu, Xiaozhou Xia, Qing Zhang
Summary: This paper proposes a novel PD-IB-LBM method for accurately and efficiently simulating the deformation and fracture of structures induced by fluid-structure interactions. The method utilizes an improved bond-based peridynamic model and lattice Boltzmann method, with immersed boundary method for the bi-directional coupling of fluid and solid. The effectiveness of the proposed method is validated through simulations of various fluid motions and structural fractures.
Article
Computer Science, Interdisciplinary Applications
Simon Gsell, Julien Favier
Summary: The study analyzed the boundary slip error caused by the interpolation/spreading non-reciprocity of the direct-forcing immersed-boundary method, and proposed a correction method to improve the no-slip condition without requiring additional computational time or implementation effort. This a priori correction significantly enhanced the accuracy of the method.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Mathematics, Interdisciplinary Applications
Shi Tao, Qing He, Baiman Chen, Frank G. F. Qin
Summary: A novel immersed boundary lattice Boltzmann method (IB-LBM) is proposed to simulate complex thermal particle flows, which improves the accuracy of boundary treatment and reduces the computational load. Three simulations of complex thermal flows validate the effectiveness of the present IB-LBM.
COMPUTATIONAL PARTICLE MECHANICS
(2021)
Article
Computer Science, Interdisciplinary Applications
Jianhua Qin, Ebrahim M. Kolahdouz, Boyce E. Griffith
Summary: The II-LBM method is developed for modeling fluid-structure systems. It effectively addresses interface force and jump condition issues with higher accuracy and volume conservation compared to other methods.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Mechanics
Kosuke Suzuki, Kou Ishizaki, Masato Yoshino
Summary: The immersed boundary method enforces the no-slip boundary condition with a volume force equivalent to a stress tensor discontinuity. A new method relaxes the bounce-back condition to improve local force calculation and eliminate spurious oscillations. Simulation results show good agreement with numerical and experimental data, demonstrating the effectiveness of the proposed approach.
Article
Mechanics
Shang-Gui Cai, Sajad Mozaffari, Jerome Jacob, Pierre Sagaut
Summary: This paper applies an immersed boundary-turbulence wall modeling approach to investigate turbulent flows over a generic car geometry, known as the Ahmed body. The study shows that the near-wall solution is significantly deteriorated compared to the body-fitted simulation, but enhanced wall treatments proposed in the literature can effectively address this issue.
Article
Computer Science, Interdisciplinary Applications
Zihao Cheng, Anthony Wachs
Summary: We propose an immersed boundary/multi-relaxation time lattice Boltzmann method for particle-resolved simulation of particle-laden flows. The method handles the no-slip boundary condition using an explicit feedback immersed boundary method and employs a smoothed discrete delta function and a multi-relaxation time collision operator for improved stability and accuracy. The method is extended to adaptive quadtree/octree grids and implemented in the open-source software Basilisk, achieving high computational efficiency and accuracy in a variety of validation cases.
JOURNAL OF COMPUTATIONAL PHYSICS
(2022)
Article
Computer Science, Interdisciplinary Applications
Alessia Abbati, Ya Zhang, William Dempster, Yonghao Zhang
Summary: Diffuse-interface immersed boundary methods have been widely used in complex fluid-structure interaction problems. However, the diffusive effects of the diffuse interface can reduce simulation accuracy, especially in confined geometries. A boundary retraction scheme is proposed to alleviate interface diffusion errors and enhance accuracy.
COMPUTERS & FLUIDS
(2022)
Article
Thermodynamics
Abouelmagd Abdelsamie, Dominique Thevenin
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2019)
Article
Engineering, Chemical
Christoph Roloff, Eduard Lukas, Berend van Wachem, Dominique Thevenin
CHEMICAL ENGINEERING SCIENCE
(2019)
Article
Computer Science, Interdisciplinary Applications
Amir Eshghinejadfard, Seyed Ali Hosseini, Dominique Thevenin
COMPUTERS & FLUIDS
(2019)
Article
Mathematics, Applied
S. A. Hosseini, A. Eshghinejadfard, N. Darabiha, D. Thevenin
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2020)
Article
Thermodynamics
Abouelmagd Abdelsamie, Frank Einar Kruis, Hartmut Wiggers, Dominique Thevenin
FLOW TURBULENCE AND COMBUSTION
(2020)
Article
Thermodynamics
Abouelmagd Abdelsamie, Cheng Chi, Monika Nanjaiah, Ivan Skenderovic, Samer Suleiman, Dominique Thevenin
Summary: Spray combustion is a crucial application in modern combustion systems, and direct numerical simulations of multiphase flows are complex and challenging. Most studies simplify the injector geometry, but realistic geometry significantly impacts evaporation and flame structure.
FLOW TURBULENCE AND COMBUSTION
(2021)
Article
Mechanics
S. A. Hosseini, A. Abdelsamie, N. Darabiha, D. Thevenin
Article
Thermodynamics
Amir Eshghinejad Fard, Mohammad Khalili
Summary: This research reports the sedimentation modes of a single cold elliptical particle with an aspect ratio of 2 in narrow hot channels. Seven sedimentation modes have been observed, and it is found that the channel width, gravity, and heat transfer affect the particle's motion direction.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2022)
Article
Computer Science, Interdisciplinary Applications
Abouelmagd Abdelsamie, Samuel Voss, Philipp Berg, Cheng Chi, Christoph Arens, Dominique Thevenin, Gabor Janiga
Summary: This study investigates the complex flow in a patient-specific geometry using three different numerical approaches, and compares their accuracy and computational efforts. The results show that LES is the most suitable method for studying transitional airflows in medical research.
COMPUTERS & FLUIDS
(2023)
Article
Thermodynamics
Thorsten Zirwes, Marvin Sontheimer, Feichi Zhang, Abouelmagd Abdelsamie, Francisco E. Hernandez Perez, Oliver T. Stein, Hong G. Im, Andreas Kronenburg, Henning Bockhorn
Summary: This work provides a direct comparison between OpenFOAM's built-in flow solvers and its reacting flow extension EBIdnsFoam with four other high-fidelity combustion codes, demonstrating excellent agreement in incompressible flows and more complex cases. OpenFOAM performs slower in simulating incompressible non-reacting flows compared to other codes, but achieves similar performance and excellent parallel scalability in simulating reacting flows. The results contribute to the benchmark suite for reacting flow solvers and provide a guide for achieving high numerical accuracy in OpenFOAM.
FLOW TURBULENCE AND COMBUSTION
(2023)
Article
Thermodynamics
Abouelmagd Abdelsamie, Hartmut Wiggers, Frank Einar Kruis, Dominique Thevenin
Summary: This article presents the latest research on nanoparticle synthesis experiments conducted on the SpraySyn burner. The authors discuss the effects of using different solvents to produce titanium-dioxide nanoparticles and find that using ethanol as a solvent leads to faster agglomeration and larger particles.
INTERNATIONAL JOURNAL OF SPRAY AND COMBUSTION DYNAMICS
(2023)
Article
Physics, Fluids & Plasmas
S. A. Hosseini, C. Coreixas, N. Darabiha, D. Thevenin
Article
Mechanics
Nicolas Bouvet, Savannah S. Wessies, Eric D. Link, Stephen A. Fink
Summary: This study presents a framework to characterize firebrand flows and compare exposure through the use of a measurement device and data processing methods. The ability to perform exposure comparisons and recognize combustion states is demonstrated.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
P. Botticini, G. Lavalle, D. Picchi, P. Poesio
Summary: This study investigates the gravity-driven liquid layer problem on an inclined plate, taking into account the variable density of the fluid. The study examines the influence of density variation on the formulation of a depth-averaged model and the role of compressibility in long-wave interfacial instability.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Jean-Paul Caltagirone
Summary: This article introduces a method for modeling capillary flows on a surface or at the interface of two fluids. The method involves handling the two components of capillary acceleration using the divergence and curl of surface normal. The proposed formulation is characterized by directional curvature based on dihedral angle, intrinsic anisotropic surface tension per unit mass, and introduction of capillary potential.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Qi-Teng Zheng, Chun-Bai-Xue Yang, Shi-Jin Feng, Yu-Chen Song, Yong Zhao, Yu-Lin Wu
Summary: This paper proposes a new two-phase partitioning boundary model to accurately predict the drying process of a porous medium from saturated to unsaturated conditions. The model is validated through laboratory soil drying tests and the study also investigates the effects of air-water interfacial area and water retention parameters on the drying process.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Alexandra Metallinou Log, Morten Hammer, Svend Tollak Munkejord
Summary: Flashing flow is commonly found in industrial systems and accurate flashing models are essential for the design of safe and efficient CO2 transportation systems. We propose a homogeneous flashing model that takes into account the physical phenomena of phase change. The model is fitted using CO2 pipe depressurization data and we find that the same model parameters can be applied for different cases.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Q. Tan, S. A. Hosseini, A. Seidel-Morgenstern, D. Thevenin, H. Lorenz
Summary: The possible impact of temperature differences during crystal growth is investigated in this study. A numerical model is developed to simulate the crystallization dynamics of (S)-mandelic acid, taking into account temperature effects. The study shows that the heat generation at the crystal interface has only a small effect on the surrounding temperature field.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Hideki Murakawa, Sana Maeda, Sven Eckert
Summary: This study investigates the behavior of bubbles in a liquid metal under the influence of a magnetic field, particularly bubble chains. The results show that increasing the magnetic field strength suppresses the oscillations of the bubbles and concentrates their crossing positions in a specific area. Applying these findings to numerical models can further optimize continuous casting processes.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Johanna Potyka, Kathrin Schulte
Summary: This paper presents an advanced Volume of Fluid (VOF) method for performing three-dimensional Direct Numerical Simulations (DNS) of the interaction of two immiscible fluids in a gaseous environment with large topology changes. The method includes efficient reconstruction of phase boundaries near the triple line using a Piecewise Linear Interface Calculation (PLIC) method and enhanced surface force modeling with the Continuous Surface Stress (CSS) model. Implementation of these methods in the multi-phase flow solver Free Surface 3D (FS3D) yielded successful validation. The simulations provide valuable insights into the collision process and can support future modeling of immiscible liquid interaction.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Martin Rohde, Sebastian Burgmann, Uwe Janoske
Summary: This study investigates the effect of superimposing an incident flow and two-dimensional vibration on the critical air flow velocity required for the detachment of a droplet. The results show that oscillatory excitation at specific frequencies can significantly reduce the critical velocity for droplet detachment.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Tea-Woo Kim, Baehyun Min
Summary: Liquid-gas two-phase slug flow is a complex flow pattern in energy systems, and accurately predicting slug liquid holdup is crucial for system design and operation. Existing HLLS models have limited applicability due to a lack of physical basis. This study proposes a new dimensionless number SP and correlates it with HLLS data, resulting in a unified HLLS correlation that agrees closely with experimental data.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Christian Lieber, Stephan Autenrieth, Kai-Yannic Schoenewolf, Amy Lebanoff, Rainer Koch, Sterling Smith, Paul Schlinger, Hans-Joerg Bauer
Summary: The observation of acoustically levitated droplets offers great potential for studying their evaporation characteristics. The main objective of this study is to present an experimental setup that minimizes the disturbing effects of the levitation technique in order to investigate convective heat and mass transfer during droplet evaporation.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Facundo Cabrera-Booman, Nicolas Plihon, Mickael Bourgoin
Summary: The settling behavior of individual spheres in a quiescent fluid was experimentally studied. The mean trajectory angle with the vertical showed complex behavior as the parameters Gamma and Ga varied. The transition from planar to non-planar trajectories and the emergence of semi-helical trajectories were observed, especially for denser spheres.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Hongbin Wang, Hanwen Luo, Jinbiao Xiong
Summary: This article introduces an iterative screening method for closure models in nucleate boiling flow simulation, and demonstrates its accuracy through experiments.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Alexandra Metallinou Log, Morten Hammer, Han Deng, Anders Austegard, Armin Hafner, Svend Tollak Munkejord
Summary: This study investigates the rapid depressurization of liquid CO2 and compares the predictions of different models. It is found that higher temperatures result in shorter relaxation times.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Rizwan Zahoor, Sasa Bajt, Bozidar Sarler
Summary: This numerical study evaluates the jet characteristics of non-Newtonian power-law fluids in a gas dynamic virtual nozzle. The results show that shear-thinning fluids result in thicker, longer, and slower jets compared to shear-thickening fluids. Additionally, a dripping-jetting phase diagram of the nozzle is obtained by varying the power law index, gas, and liquid flow rates.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)