[Paraview] Surface LIC Problem

[Richard Grenon]

Hello.

What are these non-zero surface vectors without slipping or moving walls ?

With NS solvers, the velocity vector in an axis system bound to a wall 
should ALWAYS be zero at the wall (moving wall or not moving wall): this 
is the adherence condition.

As LIC needs a non zero vector at the wall in an axis system bound to 
the wall, you cannot use the velocity vector, and you MUST use the skin 
friction vector.

My NS solver gives the three components of the skin friction vector in 
an axis system bound to the wall as three scalar arrays. So I have to 
use the PV Calculator filter in order to build the vector array from 
these three scalar arrays, something like "Friction_vector = 
x_component*iHat+y_component*jHat+z_component*kHat"

But you may also use the Calculator filter to build the friction vector 
from the stress tensor and the normal vector at the wall. It depends on 
the output of your solver.

Richard

Le 14/02/2014 14:34, Magician a écrit :
> Hi Burlen, Richard, Utkarsh,
>
>
> Thanks for your advices.
>
> I misunderstood that the Surface LIC Plugin should calculate
> some kinds of the vector fields on surfaces.
> My models are generated by NS solvers, so the surfaces have
> non-zero vectors without slipping or moving wall.
>
> For example, can I calculate surface friction vectors with ParaView?
> I have flow fields and other physical constants.
>
>
> # Extracting issue was solved by using Extract Subset filter.
> # My meshes were structured grids of turbomachinery in this time,
> # so all the walls can be extracted by the ijk coordinates.
>
>
> Magician
>


-- 
  Richard GRENON
  ONERA
  Departement d'Aerodynamique Appliquee - DAAP/ACI
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  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