[Paraview] Oilflow - Surface flow

[Adriano Gagliardi]

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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