[Paraview] Oilflow - Surface flow

[Richard GRENON]

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