Sig Turbulence / Flow over Periodic Hills
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Olivier Brugiere, Universite Joseph Fourier, Grenoble, France
Contents
1 Motivation
The flow over bodies with massive separation constitutes an important area of applications for LES. In many geometrie we can find this kind of flow like the 2D backward step, the asymetric diffuser or the periodic hill.
- 2D backward step : it's a quick test case because of it's a 2D model but the separation bubble depends of the spets.
- Asymetric diffuser : we know experimental's data which was make by Buice and Eaton [[1]]
But the probleme of ths flow is the separtion bubble which is due to a adverse pressure gradient that's why this is a test case for many subgrid scale models (SGS) and for near-wall low.
2 Testcase description and numerical results
2.1 Flow configuration
Flow over 2D periodic is in fact an experimental configuration with 9 hills. For the computational, we represent this configuration by a channel periodic with two half's hills like on the next figure : 
