Berk Geveci wrote:
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 <[email protected]> wrote:
Hi Berk,
My dataset is an Euler velocity field at the surface of an aircraft, so
it's everywhere tangent to the surface. But the grid refinement is
really an important parameter. The forebody has almost a constant
section in the area where I put the seed points, but the mesh is coarse
in the aircraft axis direction in this area, and the surface streamlines
stop after crossing one or two cells. But at the wing root, the grid is
well refined in all directions and I can obtain fuselage streamlines
crossing many cells on a distance covering more than the wing root chord.
I am sorry but the datasets I am working on cannot be shared. But you
can try the example for Custom filters in
http://www.paraview.org/Wiki/Custom_Filters. The dataset is the
disk_out_ref.ex2 from Sc07_paraview_tutorial_data.tar.gz.
In this example surface streamlines are plotted on a slice plane and I
tried to replace the slice plane by a slice sphere. Of course this is
not a good example as the vectors are not tangent to the plane or to the
sphere before applying the "Surface Vectors" filter, but it works with a
plane.
I agree with you concerning the fact that the point sould be moved back
to the surface at each step of the integration. If such an improvement
of the surface streamlines computation could be added in a future
Paraview release, it would be really a nice feature. I am always keeping
an eye on Paraview.
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:[email protected]
http://www.onera.fr
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