Wall-Distance-Free Turbulence Models Applied to Incompressible Flows
作者:
D. DRIKAKIS,
U. GOLDBERG,
期刊:
International Journal of Computational Fluid Dynamics
(Taylor Available online 1998)
卷期:
Volume 10,
issue 3
页码: 241-253
ISSN:1061-8562
年代: 1998
DOI:10.1080/10618569808961688
出版商: Taylor & Francis Group
关键词: Turbulence modelling;incompressible flows;near-wall turbulence
数据来源: Taylor
摘要:
A comparative study of low-Re wall-distance-free (WDF) turbulence models in incompressible flows is presented. The study includes the WDF k-ϵ and the three-equation WDF k-ϵ-γ as well as two k-ϵ models which invoke the distance from the wall. The models are implemented in conjunction with a characteristics-based method and an implicit unfactored scheme. Comparison with direct-numerical-simulation data reveals that the WDF models provide much more accurate results for the dissipation rate, especially in the near wall region. A grid refinement study further reveals that the models which explicitly involve the distance from the wall cannot capture the correct turbulence dissipation rate behaviour in the near-wall region even on the finest grid, where grid-independent solution is achieved. However, the low-Re WDF models require slightly more iterations than the other k - ϵ models to converge. Results are presented for channel, flat plate and backward-facing step flows.
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