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Discrete unified gas kinetic scheme for incompressible Navier-Stokes equations
- Source :
- Computers & Mathematics with Applications. 97:45-60
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- The discrete unified gas kinetic scheme (DUGKS) combines the advantages of both the unified gas kinetic scheme (UGKS) and the lattice Boltzmann method. It can adopt the flexible meshes, meanwhile, the flux calculation is simple. However, the original DUGKS is proposed for the compressible flows. When we try to solve a problem governed by the incompressible Navier-Stokes (N-S) equations, the original DUGKS may bring some undesirable errors because of the compressible effect. To eliminate the compressible effect, the DUGKS for incompressible N-S equations is developed in this work. In addition, the Chapman-Enskog analysis ensures that the present DUGKS can solve the incompressible N-S equations exactly, meanwhile, a new non-extrapolation scheme is adopted to treat the Dirichlet boundary conditions. To test the present DUGKS for incompressible N-S equations, four problems are adopted. The first one is a periodic problem driven by an external force, which is used to test the influences of Courant–Friedrichs–Lewy condition number and the M a c h number (Ma). Besides, some comparisons between the present DUGKS and some available results are also conducted. The second problem is Womersley flow, it is also used to test the influence of Ma, and the results show that the compressible effect is reduced obviously. Then, the two-dimensional lid-driven cavity flow is considered. In these simulations, the Reynolds number is varied from 400 to 1000000 to illustrate the accuracy, stability and efficiency of the present DUGKS. Finally, the numerical solutions of the three-dimensional lid-driven cavity flow suggest that the present DUGKS is suitable for the three-dimensional problems.
- Subjects :
- Lattice Boltzmann methods
Kinetic scheme
Reynolds number
010103 numerical & computational mathematics
01 natural sciences
Physics::Fluid Dynamics
010101 applied mathematics
Computational Mathematics
symbols.namesake
Computational Theory and Mathematics
Flow (mathematics)
Modeling and Simulation
Dirichlet boundary condition
symbols
Compressibility
Applied mathematics
0101 mathematics
Navier–Stokes equations
Condition number
Mathematics
Subjects
Details
- ISSN :
- 08981221
- Volume :
- 97
- Database :
- OpenAIRE
- Journal :
- Computers & Mathematics with Applications
- Accession number :
- edsair.doi...........bebc6cf899e4104cbca4a89dc092e8cd