Difference between revisions of "Sig Turbulence / Flow over Periodic Hills"
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| − | + | [[Sig Turbulence / Olivier Brugiere |Olivier Brugiere]], Universite Joseph Fourier, Grenoble, France | |
== Motivation == | == 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 | + | 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-facing step, the asymmetric diffuser or the periodic hill. |
| − | * [[Sig Turbulence / 2D backward step |2D backward step]] : it's a quick test case because of it's a 2D model but the separation bubble | + | * [[Sig Turbulence / 2D backward-facing step |2D backward-facing step]] : it's a quick test case because of it's a 2D model but the separation bubble is determined by the spet geometry. |
| − | * [[Sig Turbulence / | + | * [[Sig Turbulence / Asymmetric diffuser |Asymmetric diffuser]] : we know experimental's data which was made by Buice and Eaton [[http://www.grc.nasa.gov/WWW/wind/valid/buice/buice02/buice02.html]]. Unfortunatly, the Reynolds number of the fow was necessarily slow (<math> Re_{\tau} = 180 </math>). |
| − | + | * [[Sig Turbulence / Periodic hill |Periodic hill]] : we know experimental's data which was made by Almeida et al. [1] but in Mellen and al. [2] et Temmerman et al. [3] we can find that they have an influence of the side wall so the 1995 ERCOFTAC/IAHR workshop have cast a doubt on the true periodicity of the experimental configuration. But we have some LES with a good mesh like [[http://cfd.mace.manchester.ac.uk/cgi-bin/cfddb/prpage.cgi?81&LES&database/cases/case81/Case_data&database/cases/case81&cas81_head.html&cas81_desc.html&cas81_meth.html&cas81_data.html&cas81_refs.html&cas81_rsol.html&1&1&1&1&1&unknown]] | |
| + | |||
| + | The probleme of this 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. | ||
== Testcase description and numerical results == | == Testcase description and numerical results == | ||
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=== Simulation details === | === Simulation details === | ||
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| + | == References == | ||
| + | |||
| + | [1] | ||
| + | [2] [http://cfd.mace.manchester.ac.uk/ercoftac/database/cases/case81/Case_ref/IfH_paper.ps Mellen, Frohlich, Rodi] , 2000, Large Eddy Simulation of the flow over periodic hills, 16th IMACS World Congress , Lausanne. | ||
| + | [3] | ||
Revision as of 07:09, 29 May 2009
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-facing step, the asymmetric diffuser or the periodic hill.
- 2D backward-facing step : it's a quick test case because of it's a 2D model but the separation bubble is determined by the spet geometry.
- Asymmetric diffuser : we know experimental's data which was made by Buice and Eaton [[1]]. Unfortunatly, the Reynolds number of the fow was necessarily slow (
).
- Periodic hill : we know experimental's data which was made by Almeida et al. [1] but in Mellen and al. [2] et Temmerman et al. [3] we can find that they have an influence of the side wall so the 1995 ERCOFTAC/IAHR workshop have cast a doubt on the true periodicity of the experimental configuration. But we have some LES with a good mesh like [[2]]
The probleme of this 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 : 
2.2 Geometrical Parameters
2.3 Simulation details
3 References
[1] [2] Mellen, Frohlich, Rodi , 2000, Large Eddy Simulation of the flow over periodic hills, 16th IMACS World Congress , Lausanne. [3]
