Difference between revisions of "Sig Turbulence / Channel Flow"

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=== Flow configuration ===
 
=== Flow configuration ===
 
==== Geometrical Parameters ====
 
 
* 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>
 
  
 
==== Boundary condition ====
 
==== Boundary condition ====
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* Normal to streamwise : two walls
 
* Normal to streamwise : two walls
  
=== Simulation details ===
+
==== Geometrical Parameters ====
==== mesh generation ====
+
 
 +
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:
+
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 :
Line 42: Line 44:
 
* With the Spalding law [1]
 
* With the Spalding law [1]
 
* With the Manhart et al. law [2]
 
* With the Manhart et al. law [2]
 
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]]
 
  
 
== Numerical results ==
 
== Numerical results ==

Revision as of 07:19, 4 June 2009

Olivier Brugiere, Universite Joseph Fourier, Grenoble, France

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] ( Re_{\tau} = 1020)[[2]]. Thus the geometry is :

  • Streamwise distance : L_{x} = 12,8 h
  • Normal wall heigh  : L_{y} = 2 h
  • Spanwise distance  : L_{y} = 6,4 h

2.2 Mesh generation

We have done the mesh with an automatic tool (*.m4) which is composed by Nx \times Ny \times Nz = 50 \times 40 \times38. 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 Re_{\tau} = 1020 with Pr = 0,025 and 0,71, 2004, Int. J. Heat and Fluid Flow, vol 25, pp. 404-419.

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