|October 11, 2011, 08:56||
Surface y+ problem
Join Date: Aug 2011
Posts: 17Rep Power: 7
I need toget the surface y+ results for internal flow. I have the following equation now, but it's not showing me the correct values. Could somebody give me a solution for this.
surface_yplus = (y_velocity*cell_size)/char_viscosity;
The y_velocity is the downstream velocity direction. The cell_size is different for each region in the geometry and the char_viscosity is just a constant.
ps. It's a low speed simulation (0.75 m/s)
Thanks in advance.
Last edited by Yur; October 11, 2011 at 10:00.
|October 23, 2011, 12:53||
Join Date: Jun 2011
Posts: 139Rep Power: 9
may be it's late:
Check your formula again and compare with http://www.cfd-online.com/Wiki/Dimen...e_%28y_plus%29
u_star is not the downstream velocity.
When you follow the link for friction velocity one gets:
u_star = sqrt( tau_w / rho )
Follow the link for wall shear stress to get a formula to compute tau_w.
I hope this is helpful.
|Thread||Thread Starter||Forum||Replies||Last Post|
|[ICEM] surface mesh merging problem||everest||ANSYS Meshing & Geometry||44||April 14, 2016 06:41|
|Conversion Error||nuovodna||Open Source Meshers: Gmsh, Netgen, CGNS, ...||14||October 1, 2010 11:07|
|Can Flow-3D plot the free surface area in Iso-surface or colour variable?||therockyy||FLOW-3D||1||June 20, 2010 19:36|
|MRF and Heat transfer calculation||Susan YU||FLUENT||0||June 2, 2010 08:46|
|Recover surface from surface mesh in IcemCFD||Jerry Tanner||CFX||0||August 20, 2008 12:48|