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nat79 April 18, 2011 09:30

Surface Roughness
 
Hi,
Does anyone know if it is possible to enter a friction coefficient or surface roughness in FloWizard? If not, how would you account for the increased losses associated with running say a smooth versus a cast iron pipe?
Thanks

seaharrier April 21, 2011 08:05

Quote:

Originally Posted by nat79 (Post 304060)
Hi,
Does anyone know if it is possible to enter a friction coefficient or surface roughness in FloWizard? If not, how would you account for the increased losses associated with running say a smooth versus a cast iron pipe?
Thanks

well,
surface roughness is an optional item in CFX or Fluent.
it is not a real one but an equivalent sand size,
Remember, the roughness value should be smaller than the mesh height of first layer close to the wall.
For detailed definition related to surface roughness, SEE
NACA TM 1292 LAWS OF FLOW IN ROUGH PIPES
or other papers.


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