Flow around a surface mounted cubical obstacle: comparison of LES and RANS results

Publication date
1996
Document type
Konferenzbeitrag
Author
Lakehal, Djamel
Rodi, Wolfgang
Organisational unit
DOI
URI
ISBN
Conference
IMACS–COST Conf. on Computational Fluid Dynamics, Three–Dimensional Complex Flows, Lausanne, Switzerland, Sept. 13–15, 1995
Series or journal
Notes on Numerical Fluid Mechanics
Periodical volume
53
Book title
Computation of Three-Dimensional Complex Flows
First page
22
Last page
30
Peer-reviewed
✅
Part of the university bibliography
Nein
Abstract
The paper deals with a comparative study of LES and RANS (k-$\epsilon$ model) results for a typical bluff-body flow, namely the flow around a surface mounted cubical obstacle placed in a plane channel. For this test case detailed experimental data (Re=40,000) are available [11]. Two slightly different numerical solution procedures based on a 3-D finite-volume method are used in this investigation. The Reynolds-averaged equations for incompressible flow are solved implicitly [10], whereas in the LES code [1, 2, 3, 4, 5] an explicit second order Adams-Bashforth scheme is applied. Different formulations of the k-$\epsilon$ turbulence model are used in the RANS simulations, the standard version with wall functions, a RNG version, a modified version proposed by Kato and Launder [7], and a two-layer approach. For modeling the non-resolvable subgrid-scale motion in the LES two different models are applied, namely the well known Smagorinsky model [16] as well as the dynamic model originally proposed by Germano et al. [6]. The capability of the different methods is demonstrated by comparison with the measurements.
Cite as
Breuer, M., Lakehal, D., Rodi, W. (1996). Flow around a Surface Mounted Cubical Obstacle: Comparison of LES and RANS-Results. In: Deville, M., Gavrilakis, S., Ryhming, I.L. (eds) Computation of Three-Dimensional Complex Flows. Notes on Numerical Fluid Mechanics (NNFM), vol 49. Vieweg+Teubner Verlag. https://doi.org/10.1007/978-3-322-89838-8_4
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Published version
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