[Paraview] Pipeline suggestion

[Andy Bauer]

Some nitpicking:

1. I'm guessing you mean strain rate instead of strain since you're using
velocity.
2. For step 8 it looks like you're missing the cell surface area and the
normal (I think you should only have to calculate the scalar values to get
the force you want).

As far as the compute derivatives part, make sure you're using a recent
version as I made modifications to the vtkGradientFilter to do gradients of
non-scalar (i.e. number of components > 1) and end up with a tensor of order
1 more than the input tensor.  Let me know if you get unexpected results
with that and I'll take a look.

Andy

On Fri, Oct 16, 2009 at 9:10 AM, Renato Elias <rnelias at gmail.com> wrote:

> Folks,
>
> I'm trying to integrate hydrodynamic forces on an immersed body. Point
> velocity and pressure fields come from a FEM solver. Ok, for this purpose,
> I'll need:
>
> a). The body's surface
> b). Stress tensor (computed as cell data)
> c). Body cell normals
>
> Here goes the pipeline I'm trying to use:
>
> 1. Load the volume data
> 2. Clean to grid (to remove parallel interfaces among mesh partitions)
> 3. Compute Derivatives (output tensor type = strain)
> 4. Extract Surface
> 5. Generate Surface Normals
> 6. Point Data to Cell data (to convert point pressure in cell pressure)
> 7. Clip (to get only the body where I'd like to compute the forces)
> 8. from 7: Calculator (sigxx = -pressure+2*mu*Strain_0)
>
> repeate step 8 for other components
>
> Questions are:
>
> -- Does it make sense? I'm asking it because I have some doubts about the
> output of some of the filters I'm using (mainly steps 3 and 5)
>
> -- Is there a more straightforward way to do the same thing?
>
> Thanks for any help
>
> --
> Renato N. Elias
> ===================================
> High Performance Computing Center (NACAD)
> Federal University of Rio de Janeiro (UFRJ)
> Rio de Janeiro, Brazil
>
> Sent from Rio De Janeiro, RJ, Brazil
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