[Gmsh] Animation - modal analysis

[Christophe Geuzaine]

Thomas Ernby wrote:
> Greetings
> 
>  
> 
> I have calculated the eigen modes of a structure in a FE program and
> would like to create an animation in gmsh.
> 
>  
> 
> The data I have from the FE code is nodal displacements and eigen
> frequencies.
> 
> How do I go about creating an animation in gmsh? Should I create several
> meshes in gmsh and plot them in a sequence or can a define displacements
> of each node for each time step in gmsh?
> 

You can do both... The easiest is probably to create a single view of
vector primitives ("vector triangles", "vector tetrahedra", etc.) with
as many steps as there are eigen modes.

You can then visualize the displacements by selecting
Options>View>Aspect>Vector display>Displacement and adjust the amplitude
of the displacement with the "Displacement factor" option.

If you want to plot another field on the deformed mesh, you can also
load another view in addition to the vector view and use the
"DisplacementRaise" plugin.

Cheers,

Christophe

-- 
Christophe Geuzaine
Applied and Computational Mathematics, Caltech
geuzaine at acm.caltech.edu - http://geuz.org