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Efect of roughness over impeller head.

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Old   March 18, 2020, 09:59
Default Efect of roughness over impeller head.
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I simulated a radial pump impeller using vista CPD, Bladegen and meshing. I did the grid independency test (with smooth wall). But, when I simulate with wall roughness (0,26mm-cast iron), the head is praticly the same for smooth wall. I utilise the SST turbulence model. Does anybody can help me?

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Old   March 18, 2020, 11:48
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You already have an answer -surface roughness has low impact on pump performance. Roughness is crucial for long channels, like piping system.
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impeller head, roughness

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