[Paraview] Oilflow - Surface flow

[Lorenzo]

Hi all;
I managed to calculate the wall shear stress in openFoam using the command
 wallShearStress -latestTime
and using the results (vector) as in input for the LIC!

That's great!

Now I'd have another question related to this topic:
as I see the LIC is pretty heavy in paraview even though mine is a small geometry. I'm wondering, once I've loaded the wall shear stress, I could use the stream tracer on it to get more or less what I want. The only problem I'm having is that the line that generates the streamlines needs to be exactly on the surface of my body. Is there any way to attach the line to the surface?

Thank you again!



Il giorno 29/mar/2012, alle ore 11:24, Richard GRENON ha scritto:

> Hi Lorenzo.
> 
> If your data are the results of a CFD computation, the surface velocity should be non zero when solving Euler equations with wall slip conditions, or zero everywhere when solving the Navier-Stokes equations with wall adherence conditions (non slip). But when solving Navier-Stokes equations, you should get a skin friction vector (local tangential force) that is non zero: for LIC to give an oilflow pattern, you should use this skin friction vector instead of the velocity vector.
> 
> And please, could you tell us what was the solution given by Koen? His mail was missing.
> 
> Richard.
> 
> Lorenzo a écrit :
>> Thanks both of you, your help is really appreciated!
>> 
>> @ Richard: as I'm using the non slip condition for my walls geometry, the velocity on the surface is 0 everywhere… Just checked and the vector I get with the calculator is made by zeroes only… so, what is not clear to me, is how do I give the LIC a vector which is not zero?
>> 
>> @ Koen: that worked. Any way to reduce the number of oilflow paths?
>> 
>> Again, I would like to thank you two and everybody else in this mailing list for your help.
>> 
>> Lorenzo
> 
> -- 
> Richard GRENON
> ONERA
> Departement d'Aerodynamique Appliquee - DAAP/ACI
> 8 rue des Vertugadins
> 92190 MEUDON - FRANCE
> phone : +33 1 46 73 42 17
> fax   : +33 1 46 73 41 46
> mailto:Richard.Grenon at onera.fr
> http://www.onera.fr
>