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=== Flow configuration === | === Flow configuration === | ||
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==== Boundary condition ==== | ==== Boundary condition ==== | ||
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* Normal to streamwise : two walls | * Normal to streamwise : two walls | ||
− | === | + | ==== Geometrical Parameters ==== |
− | ==== | + | |
+ | The Reynodls number of the flow it's the same as Abe et al. [3] (<math> Re_{\tau} = 1020</math>)[[http://murasun.me.noda.tus.ac.jp/turbulence/poi/text/Poi1020_4th_A_ver2.dat]]. Thus the geometry is : | ||
+ | |||
+ | * Streamwise distance : <math>L_{x} = 12,8 h</math> | ||
+ | * Normal wall heigh : <math>L_{y} = 2 h</math> | ||
+ | * Spanwise distance : <math>L_{y} = 6,4 h</math> | ||
+ | |||
+ | === Mesh generation === | ||
We have done the mesh with an automatic tool (*.m4) which is composed by <math>Nx \times Ny \times Nz = 50 \times 40 \times38</math>. | We have done the mesh with an automatic tool (*.m4) which is composed by <math>Nx \times Ny \times Nz = 50 \times 40 \times38</math>. | ||
− | + | The mesh is composed by 4 blocks: | |
* 2 blocks for the first cell close to the wall. (Hense, y+ can be imposed) | * 2 blocks for the first cell close to the wall. (Hense, y+ can be imposed) | ||
* 2 blocks in the center | * 2 blocks in the center | ||
+ | === Simulation details === | ||
The aim of my study is testing a posteriori near-wall law. We are running three cases : | The aim of my study is testing a posteriori near-wall law. We are running three cases : | ||
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* With the Spalding law [1] | * With the Spalding law [1] | ||
* With the Manhart et al. law [2] | * With the Manhart et al. law [2] | ||
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== Numerical results == | == Numerical results == |
Revision as of 07:19, 4 June 2009
Olivier Brugiere, Universite Joseph Fourier, Grenoble, France
Contents
1 Motivation
- Test avaiable subgrid scale (SGS) model
- Test wall model on easy configuration:
- no pressure gradients
- cheap calculation
- easy to mesh
- ...
- Many DNS data base can be found (ex: the Kawmura laboratory [[1]]) to compare mean velocity and rms profiles
2 Testcase description
2.1 Flow configuration
2.1.1 Boundary condition
- Streamwise condition : periodicity
- Spanwise condition : periodicity
- Normal to streamwise : two walls
2.1.2 Geometrical Parameters
The Reynodls number of the flow it's the same as Abe et al. [3] ()[[2]]. Thus the geometry is :
- Streamwise distance :
- Normal wall heigh :
- Spanwise distance :
2.2 Mesh generation
We have done the mesh with an automatic tool (*.m4) which is composed by . The mesh is composed by 4 blocks:
- 2 blocks for the first cell close to the wall. (Hense, y+ can be imposed)
- 2 blocks in the center
2.3 Simulation details
The aim of my study is testing a posteriori near-wall law. We are running three cases :
- Without wall model
- With the Spalding law [1]
- With the Manhart et al. law [2]
3 Numerical results
4 References
[1] Spalding, 1961, A single formula for the law of the wall, J. Appl. Mech., vol 28, pp. 455-457
[2] Manhart Peller and Brun, 2008, Near-wall scaling for turbulent boundary layers with adverse pressure gradient, Theor. Comput. Fluid Dyn., vol 22 , pp. 243-260.
[3] Abe, Kawamura and Matsuo, Surface heat-flux fluctuations in a turbulent channel flow up to with Pr = 0,025 and 0,71, 2004, Int. J. Heat and Fluid Flow, vol 25, pp. 404-419.
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