[OpenFOAM] Viscous forces in paraview

WhiteW · December 22, 2015, 06:33

Hi, How is it possible to calculate the viscouse forces of an OpenFoam simulation in paraview?
In Openfoam I can obtain the sum of pressure forces and viscous forces with the libforces utility.

In paraview I obtain the pressure forces using the following filters:
extractSurfaces
generateSurfaceNormals
calculator (p-pref)*normals
integrate variables

However how can I calclulate the sum of viscous forces in paraview?
Thanks,
WhiteW

tomf · January 6, 2016, 04:12

Hi,

If you run the wallShearStress utility prior to opening ParaView you can just integrate the wallShearStress vector. There may be a *(-1) required to get the correct direction (I remember this from a couple of years ago, things may have changed).

Regards,
Tom

December 22, 2015, 06:33	Viscous forces in paraview	#1
WhiteW Member Join Date: Dec 2015 Posts: 74 Rep Power: 10	Hi, How is it possible to calculate the viscouse forces of an OpenFoam simulation in paraview? In Openfoam I can obtain the sum of pressure forces and viscous forces with the libforces utility. In paraview I obtain the pressure forces using the following filters: extractSurfaces generateSurfaceNormals calculator (p-pref)*normals integrate variables However how can I calclulate the sum of viscous forces in paraview? Thanks, WhiteW anon_q likes this.

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January 6, 2016, 04:12		#2
tomf Senior Member Tom Fahner Join Date: Mar 2009 Location: Breda, Netherlands Posts: 634 Rep Power: 32	Hi, If you run the wallShearStress utility prior to opening ParaView you can just integrate the wallShearStress vector. There may be a *(-1) required to get the correct direction (I remember this from a couple of years ago, things may have changed). Regards, Tom