K-ω 난류방정식을 위한 다중격자기법의 수렴성 연구 Convergence Study of Multigrid Method for K-ω Turbulence Equations

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An efficient implicit multigrid method is presented for the Navier- Stokes and k-ω turbulence equations. Freezing and limiting strategies are applied to improve the robustness and convergence of the multigrid method. The eddy viscosity and strongly nonlinear production terms of turbulence are frozen in the coarser grids by passing down the values without update of them. The turbulence equations together with the Navier-Stokes equations, however, are consecutively solved on the coarser grids in a loosely coupled fashion. A simple limit for k is also introduced lo circumvent slow down of convergence. Numerical results for the unseparated and separated transonic airfoil flows show that all computations converge well without any robustness problem and the computing time is reduced to a factor of about 3 by the present multigrid method.
Publisher
한국전산유체공학회
Issue Date
2002-12
Language
Korean
Citation

한국전산유체공학회지, v.7, no.4, pp.19 - 27

ISSN
1598-6071
URI
http://hdl.handle.net/10203/10007
Appears in Collection
AE-Journal Papers(저널논문)
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