# wall roughness in OpenFOAM

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 July 29, 2015, 06:56 wall roughness in OpenFOAM #1 Member   harshawardhank Join Date: Mar 2014 Posts: 85 Rep Power: 4 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.

 November 15, 2016, 21:43 #2 Member   Al Join Date: Jul 2013 Location: Japan Posts: 45 Blog Entries: 3 Rep Power: 6 - 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; }``` where 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; }``` where: roughnessHeight roughness height roughnessConstant roughness constant roughnessFactor scaling factor

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