'Re: [Paraview] Oilflow - Surface flow'

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List:       paraview
Subject:    Re: [Paraview] Oilflow - Surface flow
From:       Lorenzo <lovecraft22 () gmail ! com>
Date:       2012-03-29 18:06:52
Message-ID: CEE6A3D2-AF25-4D77-8E5E-A54227479EED () gmail ! com
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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@ara.co.uk
> Url: www.ara.co.uk 
> -----Original Message-----
> From: paraview-bounces@paraview.org [mailto:paraview-bounces@paraview.org]
> On Behalf Of David E DeMarle
> Sent: 29 March 2012 15:13
> To: Richard GRENON
> Cc: paraview@paraview.org
> Subject: Re: [Paraview] Oilflow - Surface flow
> 
> On Thu, Mar 29, 2012 at 9:58 AM, Richard GRENON <richard.grenon@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@onera.fr
> > http://www.onera.fr
> > 
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