[Paraview] Oilflow - Surface flow

[Lorenzo]

Thank you anybody once again. I'm very pleased to see you can get so many tips here and that there are so many people from the industry.

From what I've seen so far the LIC seems the best way. I tried do uncheck the  "Use LIC when using LOD" option as per Richard suggestion but it doesn't seem to have sorted any effect… actually, it doesn't seem to work at all on a mac and it also caused paraview to crash…

About the stream tracer with custom source, I tried that but the result is quite ugly (even though you can see some flow characteristics).

I think for now I'll stick to the LIC.

Thank you all again!

Lorenzo

Il giorno 29/mar/2012, alle ore 16:48, Adriano Gagliardi ha scritto:

> 
> Best way I've found so far for oilflows is to:
> 
> (1) Select surface and run mask points (random, say 100 points)
> (2) Use the stream tracer with custom source (being the mask points filter)
> 
> That should give some good answers. ParaView does need a form of
> snap-to-surface spline to overcome the issue Lorenzo had.
> 
> ===================================
> 
> Adriano Gagliardi MEng PhD
> Business Sector Leader
> Computational Aerodynamics
> Aircraft Research Association Ltd.
> Manton Lane
> Bedford
> 
> Tel: 01234 32 4644
> E-mail: agagliardi at ara.co.uk
> Url: www.ara.co.uk 
> -----Original Message-----
> From: paraview-bounces at paraview.org [mailto:paraview-bounces at paraview.org]
> On Behalf Of David E DeMarle
> Sent: 29 March 2012 15:13
> To: Richard GRENON
> Cc: paraview at paraview.org
> Subject: Re: [Paraview] Oilflow - Surface flow
> 
> On Thu, Mar 29, 2012 at 9:58 AM, Richard GRENON <richard.grenon at onera.fr>
> wrote:
>> Hi Lorenzo.
>> 
>> The Stream Tracer works very well to follow a 3D streamline in a  
>> volume, but I always got bad results to follow streamlines on a curved 
>> surface. When you start from a point on a surface to follow a 
>> streamline, the next point is found with a small step in the direction 
>> of the tangent vector, but this new point is not on the surface if the 
>> surface is curved. So the new point should be projected onto the surface
> before proceeding to the next step.
> 
> I think the surface vectors and surface flows filters are meant to address
> this problem.
> 
>> 
>> Lorenzo a écrit :
>> 
>>> Hi all;
>>> I managed to calculate the wall shear stress in openFoam using the 
>>> command
>>>  wallShearStress -latestTime
>>> and using the results (vector) as in input for the LIC!
>>> 
>>> That's great!
>>> 
>>> Now I'd have another question related to this topic:
>>> as I see the LIC is pretty heavy in paraview even though mine is a 
>>> small geometry. I'm wondering, once I've loaded the wall shear 
>>> stress, I could use the stream tracer on it to get more or less what 
>>> I want. The only problem I'm having is that the line that generates 
>>> the streamlines needs to be exactly on the surface of my body. Is 
>>> there any way to attach the line to the surface?
>>> 
>>> Thank you again!
>>> 
>>> 
>> 
>> --
>> 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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