First cell height calculation
From CFD-Wiki
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* [[Dimensionless wall distance (y plus)]] | * [[Dimensionless wall distance (y plus)]] | ||
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* [[Friction velocity]] | * [[Friction velocity]] | ||
* [[Wall shear stress]] | * [[Wall shear stress]] | ||
Revision as of 13:36, 28 November 2011
| Introduction |
| Mesh classification |
| Structured mesh generation |
| Unstructured mesh generation |
| Special topics |
|
While performing CFD simulations, it is critical that one capture boundary layer near the wall properly. In order to do that, the mesh should be generated in such a manner that it captures boundary layer properly. For turbulent flows, calculation of the Y plus value of the first interior node/gridpoint helps in doing that. This dimensionless distance is defined as
where 
is the friction velocity defined as
The wall shear 
can probably not be determined until after a simulation has been completed, so it is usually necessary to estimate a value, and then check after a simulation is complete.
