A non-iterative direct-forcing immersed boundary method for thermal discrete unified gas kinetic scheme with Dirichlet boundary conditions

2019 ◽  
Vol 137 ◽  
pp. 476-488 ◽  
Author(s):  
Shi Tao ◽  
Qing He ◽  
Lei Wang ◽  
Simin Huang ◽  
Baiman Chen
Keyword(s):  
Boundary Conditions ◽  
Immersed Boundary Method ◽  
Dirichlet Boundary ◽  
Kinetic Scheme ◽  
Dirichlet Boundary Conditions ◽  
Immersed Boundary ◽  
Boundary Method ◽  
Direct Forcing ◽  
Unified Gas Kinetic Scheme

An Efficient Immersed Boundary Method Based on Penalized Direct Forcing for Simulating Flows Through Real Porous Media

2012 ◽  
Author(s):  
Wim-Paul Breugem ◽  
Vincent van Dijk ◽  
René Delfos
Keyword(s):  
Porous Medium ◽  
Ct Scan ◽  
Immersed Boundary Method ◽  
Volume Fraction ◽  
Solid Volume Fraction ◽  
Particle Diameter ◽  
Immersed Boundary ◽  
Average Particle ◽  
Boundary Method ◽  
Direct Forcing

A computationally efficient Immersed Boundary Method (IBM) based on penalized direct forcing was employed to determine the permeability of a real porous medium. The porous medium was composed of about 9000 glass beads with an average particle diameter of 1.93 mm and a porosity of 0.367. The forcing of the IBM depends on the local solid volume fraction within a computational grid cell. The latter could be obtained from a high-resolution X-ray Computed Tomography (CT) scan of the packing. An experimental facility was built to determine the permeability of the packing experimentally. Numerical simulations were performed for the same packing based on the data from the CT scan. For a scan resolution of 0.1 mm the numerical value for the permeability was nearly 70% larger than the experimental value. An error analysis indicated that the scan resolution of 0.1 mm was too coarse for this packing.

On the numerical oscillation of the direct-forcing immersed-boundary method for moving boundaries

2012 ◽  
Vol 56 ◽  
pp. 61-76 ◽  
Author(s):  
Haoxiang Luo ◽  
Hu Dai ◽  
Paulo J.S.A. Ferreira de Sousa ◽  
Bo Yin
Keyword(s):  
Immersed Boundary Method ◽  
Moving Boundaries ◽  
Immersed Boundary ◽  
Boundary Method ◽  
Direct Forcing

scholarly journals A Sharp-Interface Immersed Boundary Method for Simulating High-Speed Compressible Inviscid Flows

2020 ◽  
Author(s):  
Junjie Wang ◽  
Xiangyu Gu ◽  
Jie Wu
Keyword(s):  
Boundary Conditions ◽  
Immersed Boundary Method ◽  
High Speed ◽  
Compressible Flows ◽  
Wall Slip ◽  
Sharp Interface ◽  
Immersed Boundary ◽  
Boundary Method ◽  
Lift Off ◽  
Inviscid Compressible Flows

Abstract This paper presents a robust sharp-interface immersed boundary method for simulating inviscid compressible flows over stationary and moving bodies. The flow field is governed by Euler equations, which are solved by using the open source library OpenFOAM. Discontinuities such as those introduced by shock waves are captured by using Kurganov and Tadmor divergence scheme. Wall-slip boundary conditions are enforced at the boundary of body through reconstructing flow variables at some ghost points. Their values are obtained indirectly by interpolating from their mirror points. A bilinear interpolation is employed to determine the variables at the mirror points from boundary conditions and flow conditions around the boundary. To validate the efficiency and accuracy of this method for simulation of high-speed inviscid compressible flows, four cases have been simulated as follows: supersonic flow over a 15 angle wedge, transonic flow past a stationary airfoil, a piston moving with supersonic velocity in a shock tube and a rigid circular cylinder lift-off from a flat surface triggered by a shock wave. Compared to the exact analytical solutions or the results in literature, good agreement can be achieved.

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