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, Aerospace
Francesco Capizzano, Triyantono Sucipto
Summary: This paper describes a research effort towards understanding unsteady phenomena due to high-lift devices deployment, utilizing a dynamic IB technique. The research explores new approaches to multi-body motion and dynamic IB methods.
AIRCRAFT ENGINEERING AND AEROSPACE TECHNOLOGY
(2022)
Article
Computer Science, Interdisciplinary Applications
Tiantian Xu, Jung-Il Choi
Summary: Efficient monolithic immersed boundary projection methods with staggered time discretization were proposed for incompressible viscous flows with heat transfer. The main idea is to use a two-step approximate lower-upper decomposition technique to decouple the momentum and energy equations, including immersed boundary forcing. Various MIBPM variants based on forcing schemes were numerically evaluated. The proposed MIBPM presents accurate imposition of no-slip conditions and exhibits good stability for both two-dimensional and three-dimensional heat transfer flows over moving objects.
JOURNAL OF COMPUTATIONAL PHYSICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Shang-Gui Cai, Johan Degrigny, Jean-Francois Boussuge, Pierre Sagaut
Summary: An improved coupling method of immersed boundary method and turbulence wall models on Cartesian grids is proposed to generate smooth wall surface pressure and skin friction at high Reynolds numbers. Various modifications are presented to enhance the near wall solution, and the validity of the method is demonstrated through numerical benchmark tests.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Chemistry, Physical
Abdellah Bouchendouka, Zine El Abiddine Fellah, Zakaria Larbi, Zineeddine Louna, Erick Ogam, Mohamed Fellah, Claude Depollier
Summary: This study investigates the laminar flow of a viscous non-Newtonian fluid in a rough-walled pipe. The rheology of the fluid is described using the power-law model, and the roughness of the pipe surface is measured using surface fractal dimensions. The results show that shear thinning fluids are more sensitive to surface roughness compared to Newtonian and shear thickening fluids. For a specific value of the surface fractal dimension, there is an intersection point where shear thinning, Newtonian, and shear thickening fluids behave similarly in terms of velocity profile and friction factor.
Review
Mechanics
Xiao-Dong Niu, Jin-Xiang Zhou, Hong-Wei Xiao, Ya-Ping Wang, Adnan Khan, Mu-Feng Chen, De-Cai Li, Hiroshi Yamaguchi
Summary: This paper proposes a simple diffuse interface immersed-boundary scheme for multiphase flows with curved boundaries. The method can handle wetting boundary conditions for stationary and moving curved boundaries, and has the advantages of simple implication, good accuracy, and mass conservation property.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2022)
Article
Engineering, Multidisciplinary
Mohammad Fazli, Murray Rudman, Shibo Kuang, Andrew Chryss
Summary: This paper describes the numerical methodology of several versions of immersed boundary methods (such as Volume Penalization IBM, Indirect Imposition of Discrete Forcing IBM, and Direct Imposition of Discrete Forcing IBM) and their applications in Newtonian and yield-pseudoplastic flows. The investigation shows that explicit forcing methods are incompatible with flows with non-Newtonian yield-pseudoplastic rheology, while the implicit forcing method is reliable for modeling non-Newtonian flows.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Engineering, Civil
Sydney D. Ryan, Robert C. Ripley, Fue-Sang Lien, Fan Zhang
Summary: This study presents a simple and robust method for modeling the dispersion of chemical, biological, and radiological gases. The authors propose a coupled multigrid approach for handling immersed boundaries at multiple grid levels, which accelerates convergence by selectively applying grid refinement at coarse grid levels. Experimental results show significant speed improvements of the coupled multigrid solver compared to the segregated approach, making it suitable for CFD-based CBR assessment tools at different scales.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Antoine Michael Diego Jost, Stephane Glockner
Summary: The article proposes linear/quadratic square shifting methods to improve the accuracy and convergence of ghost-cell immersed boundary methods for Cartesian grids. The methods aim to increase the order of convergence while maintaining a maximum stencil size of 2, and are evaluated through a comprehensive verification and validation process.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Mathematics
Giuseppe Cardone, Carmen Perugia, Manuel Villanueva Pesqueira
Summary: The study focused on an incompressible Bingham flow in a thin domain with rough boundaries, analyzing its asymptotic behavior as epsilon approaches zero. The research obtained a homogenized limit problem for velocity and pressure, preserving the nonlinear nature of the flow, and investigated the effects of microstructure on the effective equations. Finally, the interpretation of the limit problem in terms of a non-linear Darcy law was presented.
INTEGRAL EQUATIONS AND OPERATOR THEORY
(2021)
Article
Geochemistry & Geophysics
Ahmet Sefer, Ali Yapar
Summary: This paper presents an algorithm for reconstructing locally rough inaccessible surface profiles using scattered field data and the impedance boundary condition. The algorithm solves the surface integral equation iteratively with the data equation to obtain the image of the surface profile. Numerical examples demonstrate the feasibility and effectiveness of the method.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2022)
Article
Mechanics
Soonpil Kang, Arif Masud
Summary: This paper introduces a new stabilized form of incompressible Navier-Stokes equations for weak enforcement of Dirichlet boundary conditions at immersed boundaries, derived using the VMS method without user defined parameters. Through a set of benchmark problems, it is shown that the proposed method is mathematically robust and computationally stable and accurate.
Article
Engineering, Chemical
Qiang Li, Fangcao Qu
Summary: This work simulated the polymer melt filling process using a coupled finite volume and level-set based immersed boundary method, and analyzed the effects of Reynolds number on the flow patterns of the polymer melt. The results showed differences in flow patterns and melt characteristics under different Reynolds numbers.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Physics, Multidisciplinary
Subin P. Joseph
Summary: Three different families of new exact solutions for second grade fluid flows are derived in this paper, including two-dimensional exact solutions, planar solutions, and pseudo-planar solutions. These exact solutions provide important theoretical foundation for understanding fluid flows.
CHINESE JOURNAL OF PHYSICS
(2022)
Article
Physics, Mathematical
Jianhua Qin, Xiaolei Yang, Zhaobin Li
Summary: A coupling framework that combines the advantages of different immersed boundary methods is proposed for simulating particle-laden turbulent flows in complex boundary environments. The proposed approach is validated through various benchmark problems and demonstrates good agreement with literature results. It provides an efficient way to simulate complex flow phenomena in particle-laden turbulent flows.
COMMUNICATIONS IN COMPUTATIONAL PHYSICS
(2022)
Article
Computer Science, Interdisciplinary Applications
S. Zandi, A. Mohammadi, J. M. Floryan
JOURNAL OF COMPUTATIONAL PHYSICS
(2015)
Article
Mechanics
A. Mohammadi, H. V. Moradi, J. M. Floryan
JOURNAL OF FLUID MECHANICS
(2015)
Article
Engineering, Mechanical
Alireza Mohammadi, Alexander J. Smits
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
(2016)
Article
Computer Science, Interdisciplinary Applications
A. Mohammadi, J. M. Floryan
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS
(2012)
Article
Mechanics
A. Mohammadi, J. M. Floryan
JOURNAL OF FLUID MECHANICS
(2013)
Article
Engineering, Mechanical
A. Mohammadi, J. M. Floryan
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
(2015)
Article
Mechanics
A. Mohammadi, J. M. Floryan
Article
Mechanics
A. Mohammadi, J. M. Floryan
Article
Mechanics
A. Mohammadi, J. M. Floryan
THEORETICAL AND COMPUTATIONAL FLUID DYNAMICS
(2014)
Article
Mechanics
Alireza Mohammadi, Alexander J. Smits
JOURNAL OF FLUID MECHANICS
(2017)
Article
Mathematics, Applied
N. Sakib, A. Mohammadi, J. M. Floryan
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2017)
Proceedings Paper
Engineering, Mechanical
Jerzy M. Floryan, A. Mohammadi
PROCEEDINGS OF THE ASME FLUIDS ENGINEERING DIVISION SUMMER MEETING, 2012, VOL 1, PTS A AND B, SYMPOSIA
(2012)
Article
Computer Science, Interdisciplinary Applications
Ashish Bhole, Herve Guillard, Boniface Nkonga, Francesca Rapetti
Summary: Finite elements of class C-1 are used for computing magnetohydrodynamics instabilities in tokamak plasmas, and isoparametric approximations are employed to align the mesh with the magnetic field line. This numerical framework helps in understanding the operation of existing devices and predicting optimal strategies for the international ITER tokamak. However, a mesh-aligned isoparametric representation encounters issues near critical points of the magnetic field, which can be addressed by combining aligned and unaligned meshes.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
Federico Vismara, Tommaso Benacchio
Summary: This paper introduces a method for solving hyperbolic-parabolic problems on multidimensional semi-infinite domains. By dividing the computational domain into bounded and unbounded subdomains and coupling them using numerical fluxes at the interface, accurate numerical solutions are obtained. In addition, computational cost can be reduced by tuning the parameters of the basis functions.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
Keigo Enomoto, Takato Ishida, Yuya Doi, Takashi Uneyama, Yuichi Masubuchi
Summary: We have developed a novel Moving Particle Simulation (MPS) method to accurately reproduce the motion of fibers in sheared liquids. By introducing the micropolar fluid model, we address the issue of fibers being aligned with the flow direction in conventional MPS simulations. Our method is capable of accurately reproducing the fiber motion predicted by Jeffery's theory.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS
(2024)
