[Paraview] Oilflow - Surface flow

[Lorenzo]

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



Il giorno 28/mar/2012, alle ore 15:51, Richard GRENON ha scritto:

> Hello Lorenzo.
> 
> First, you should check that the "Result" vector that you built in the Calculator filter is the vector used by LIC: check it at the bottom of the Display tab of your Calculator object.
> 
> Second, your vector should not be the (0,0,0) vector ! Of course, if your scalars U_X, U_Y and U_Z are 0 everywhere, the "Result" Vector will be (0,0,0) everywhere and LIC will not work! LIC absolutely needs a vector that is not (0,0,0) ant that is different from the Normal vector !
> 
> Making an "oilflow" visualization if you don't have a non zero surface velocity vector or a non zero skin friction vector makes no sense. But you may get something that looks like an oilflow provided you use any vector that has a non zero projection on the surface. For instance, using several instances of the Calculator filter, you may construct each scalar component vx, vy, vz of the vector from formulas using the x,y,z coordinate, then build a "Result" vector from these non zero scalar components. But it will be better if you can provide data with some kind of surface velocity or friction vector.
> 
> Richard.
> 
> Lorenzo a écrit :
>> Thank you Richard.
>> 
>> Maybe I'm missing something but I don't get anything…
>> Once I've built the vector as U_X*iHat+U_Y*jHat+U_Z*kHat with the calculator, what should I do? Also, as my velocity is 0 on the surface, I think this vector I built equals (0,0,0) everywhere… Isn't it?
>> 
> 
> 
> -- 
> 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
> 

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