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July 29, 2015, 06:56 |
wall roughness in OpenFOAM
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#1 |
Senior Member
harshawardhank
Join Date: Mar 2014
Posts: 209
Rep Power: 13 |
I want to give roughness for wall in OpenFOAM
how should I give this???? what is the difference between nutURoughWallFunction and nutkRoughWallFunction and when I'm using following t type nutURoughWallFunction::Ks; value uniform 0.001; type nutURoughWallFunction::Cs; value uniform 0.5; it produces following error Unknown patchField type nutURoughWallFunction::Cs for patch type wall Last edited by harsha_kulkarni; July 29, 2015 at 08:43. |
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November 15, 2016, 20:43 |
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#2 |
Member
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- nutkRoughWallFunction
http://www.openfoam.com/documentatio...0.html#details This boundary condition provides a turbulent kinematic viscosity condition when using wall functions for rough walls, based on turbulence kinetic energy. The condition manipulates the E parameter to account for roughness effects. Parameter ranges: roughness height = sand-grain roughness (0 for smooth walls) roughness constant = 0.5-1.0 Example of the boundary condition specification: Code:
myPatch { type nutkRoughWallFunction; Ks uniform 0; Cs uniform 0.5; } Ks sand-grain roughness height Cs roughness constant -------------------------------------- - nutURoughWallFunction [http://www.openfoam.com/documentatio....html#details] This boundary condition provides a turbulent kinematic viscosity condition when using wall functions for rough walls, based on velocity. Example of the boundary condition specification: Code:
myPatch { type nutURoughWallFunction; roughnessHeight 1e-5; roughnessConstant 0.5; roughnessFactor 1; } roughnessHeight roughness height roughnessConstant roughness constant roughnessFactor scaling factor |
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October 31, 2017, 22:40 |
function
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#3 | |
New Member
xin
Join Date: Jun 2016
Posts: 9
Rep Power: 9 |
Do you know the exact equation for turbulent kinematic viscosity based on the two wall functions?
Quote:
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