[Paraview] How to plot Surface StreamLines

[Berk Geveci]

Hi Richard,

If you have an example dataset you can share, I would like to play
around a bit. The reason the streamlines are terminating prematurely
is because streamlines are leaving the surface because of integration
inaccuracy. Making sure that all of the velocity values are tangential
to the surface would help but not necessarily fix the issue. What
needs to happen is a change in the algorithm that move the points back
to the surface when integration along the surface. I know someone who
has done this in the past. I'll check with him to see if he would
contribute his changes.

-berk

On Fri, Apr 10, 2009 at 5:35 AM, Richard GRENON <richard.grenon at onera.fr> wrote:
> Jacques Papper wrote:
>>
>> I would try :
>>
>> - diminishing the step size (in cell length)
>> - Putting a very high number of steps
>> - Decreasing the termination speed
>>
> I tried this. The best results are obtained with a step size of 0.01 cell
> length on my data,and I get always short peaces of surface streamlines.
> I discovered that the grid refinement was also an important parameter:
> - when the grid is coarse at the seed point location, the surface streamline
> stops after crossing only one or two cells.
> - when the grid is well refined at the seed point location, the surface
> streamline is longer and propagates over many cells, but it never reaches
> the boundary of the surface.
>
> So I think that the best workaround is to put many seed points all over the
> surface. If someone has a better idea...
>
> Best regards.
>
> --
> 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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