[Paraview] calculate flow rate through a "selected" cross-section?

[Pei-Ying Hsieh]

Hi, David,


Thanks for the reply!

I tried Generate Surface Normal first, then, did Integrate Variables.  I got values for "Surface Normal (vector)" "p (scalar)" "U (vector)" ...

It looks like integrate only sums up each parameter, so that, Surface Normal and U are still a vector.  It does not do U dot A.

I have also tried Surface Flow.  I got two values for Surface Flow, something like [-3.64248e-6 -3.64248e-6].  Shouldn't it be just one value?

Pei-Ying



________________________________
 From: David E DeMarle <dave.demarle at kitware.com>
To: Pei-Ying Hsieh <phsieh2005 at yahoo.com> 
Cc: paraview <paraview at paraview.org> 
Sent: Wednesday, April 25, 2012 11:17 AM
Subject: Re: [Paraview] calculate flow rate through a "selected" cross-section?
 
Use Generate Normals before the calculator and Integrate Variables after.

Also try the Surface Flow which I does all three operations at once.

David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909


On Wed, Apr 25, 2012 at 11:09 AM, Pei-Ying Hsieh <phsieh2005 at yahoo.com> wrote:
> Dear Paraview experts,
>
> I completed a CFD calculations which contains, U (velocity field) and p
> (pressure field).
> I used "extract selection" to select a cross section.  I then would like to
> calculate the flow rate through this cross section, ie, U dot A.  I tried to
> use the Calculator function.  I saw U in the vector field.  Is there a way
> to have A (area, vector field) so that I can do U dot A, then, integrate
 U
> dot A to have flow rate?
>
> Thanks!
>
> Pei-Ying
>
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