[Paraview] [EXTERNAL] ExodusII and mode shape animation

[Moreland, Kenneth]

The online ParaView guide has some introductory material for the Python Programmable Filter (http://paraview.org/Wiki/ParaView/Users_Guide/Python_Programmable_Filter).  It helps if you are familiar with programming directly with VTK.

By convention, ParaView will automatically apply a displacement vector with a name starting with "DIS" (not cap sensitive).  If you want to scale the magnitude of the displacement in the saved file, you have to scale all the displacement vectors.  The multiplier you see in the GUI cannot be set from the Exodus file.

It is impossible to set the "Has Mode Shape" value from within the Exodus file.  You have to know to click the box in the GUI.  That's just an annoying limitation of the Exodus file format.

-Ken

From: Paw Møller <pawsen at gmail.com<mailto:pawsen at gmail.com>>
Date: Wed, 14 Dec 2011 09:55:12 +0100
To: Kenneth Moreland <kmorel at sandia.gov<mailto:kmorel at sandia.gov>>
Cc: "paraview at paraview.org<mailto:paraview at paraview.org>" <paraview at paraview.org<mailto:paraview at paraview.org>>
Subject: Re: [EXTERNAL] [Paraview] ExodusII and mode shape animation

I'm new to the Python Programmable Filter, so would you mind pointing me to a tutorial or maybe sending an example file?

Is it possible to write the magnifying factor(applying displ.) and tick the "Has Mode Shape" directly to the exodusII file from my fortran program?
And can I find any documentation on what paraview can read from an exodus-file, in terms of applying  'options'?

Paw

2011/12/13 Moreland, Kenneth <kmorel at sandia.gov<mailto:kmorel at sandia.gov>>
You can use the has mode shape function to write multiple mode shapes to the same exodus file.  You could identify the frequency using the time.  It's a logical use for it, but ParaView won't do anything with that other than print it in a label.

The automatic mode shape animation supported by the Exodus reader won't work for you.  It assumes that all displacements have the same phase.  (That is, it assumes that u = 1 + 0i for all points.)

You could do the animation fairly easily in a Python Programmable Filter using the equations you provided.  You might be able to do it with the Python Calculator, but I'm not sure you can access the current time value from it.  One of the Python gurus would have to speak up here.

-Ken

From: Paw Møller <pawsen at gmail.com<mailto:pawsen at gmail.com>>
Date: Tue, 13 Dec 2011 12:27:46 +0100
To: <paraview at paraview.org<mailto:paraview at paraview.org>>
Subject: [EXTERNAL] [Paraview] ExodusII and mode shape animation

Hi

First of: I write to the ExodusII format from my own fortran program.

I would like to animate some mode shapes (or complex harmonic solutions).
My solution is a complex vector u. The physical displacement over e.g one period is then
              d = Re( u*exp(i*omega*t)) =>
              d = Re(u)*cos(omega*t)-Im(u)*sin(omega*t)

To animate this I could write the real and imaginary part of u in two vectors, and then multiply with cosine and -sine. But then I have to do that for each timestep somehow and I dont know how to do that. Would it be possible to write a vector containing the timesteps and then do the math with the calculator?

The ExodusII has a 'has mode shape' function. But I haven't been able to find any examples/documentation on it. It seems that you write the eigenfrequency as time for the corresponding displacementvector. But how do you animate the modeshape itself?

Any help is appriciated!
Thanks,
Paw _______________________________________________ Powered by www.kitware.com<http://www.kitware.com> Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the ParaView Wiki at: http://paraview.org/Wiki/ParaView Follow this link to subscribe/unsubscribe: http://www.paraview.org/mailman/listinfo/paraview

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