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swiss_zhang August 25, 2011 03:07

Sand Grain Roughness
Hello, everybody

Does anybody know the definition of Equivalent Sand Grain Roughness? How does it relate to the real roughness of a material?

For example, if i know the real roughness of a material, how should i set the sand grain roughness for simulating a friction wall in CFX?


noslip August 30, 2011 03:11

that depends on how your "real roughness" was determined and what data you have available (Ra, Rz, some older type ...).

there won't be a single, precise answer, i can tell you that :)

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