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specify the turbulence intensity and the turbulence length |
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May 15, 2013, 06:36 |
specify the turbulence intensity and the turbulence length
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Bent Alstrup
Join Date: May 2013
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Hi All
I have a lag of knowledge regarding how to specify the turbulence intensity and the turbulence length for valve in given situations. I am trying to replicate some physical test data in CFD simulation. I have tried all sorts of variations on the mesh, internal surface roughness, turbulence intensity from 2 to 20% and turbulence length form 0,002 to 1 m, the larger the turbulence length the closer the result but still far off. In the physical world the test results where DN 80 manual balancing valve KV at 12mm opening and there the opening ring cross section perpendicular to the flow direction is app.322,16 mm² nominal flow velocity in the pipe of 4 m/s Flow measured in test: 14,83 m³/h. Fluent simulation. Same situation 16,75 m³/h Simulation flow 2012, Same situation 20,68 -19,11 m³/h dependent on mesh turbulence settings. Is this really how close I can expect to get. Thank you for your help. Best Regards Bennoman75 Last edited by bennoman75; May 16, 2013 at 01:59. Reason: Missing data. |
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