[CIG-SHORT] PyLith 1.1.2 questions

[Charles Williams]

Hi Tabrez,

1.  As far as I know, we can't output the vtk information separately  
for different material groups.  The reason is that each type of  
material could have different types and numbers of parameters and  
state variables, which vtk can't handle.  Once we have HDF5 output, we  
shouldn't have this problem anymore.  I believe that it should be  
possible to suppress the output_t*vtk files, but I will need to try  
some options to see what you need to do.

2.  You specify the viscosity for Maxwell materials.  Internally, the  
Maxwell time is used, but viscosity is the input parameter.

3.  I haven't tried velocity BC yet.  What you have looks OK, I think,  
but I will need to double-check.

Charles


On May 16, 2008, at 3:46 AM, Tabrez Ali wrote:

> PyLith developers
>
> 1. With respect to example "../3d/hex8"
>
>    (a) Is it possible to output all the cell/element data in a single
> vtk file instead of each material block separately (just like the way
> displacements are, for example:
>    [pylithapp.problem.formulation.output.output.writer]
>    filename = displacements.vtk)
>
>    (b) Can we suppress all the output_t*vtk files from being generated
>
> 2. While using a maxwell viscoelastic material do we specify its  
> maxwell
> relaxation time or its viscosity (The manual says maxwell time but it
> seems that the benchmark problems use viscosity)
>
> 3. If I want a node/node-set to have a displacement BC at t=0 and then
> want it to move with a Velocity BC then is this the correct order:
>    [pylithapp.timedependent.bc.bc1]
>    label = 1
>    fixed_dof = [0, 1, 2]
>    db = spatialdata.spatialdb.SimpleDB
>    db.iohandler.filename = bc_1.spatialdb
>    rate_db = spatialdata.spatialdb.SimpleDB
>    rate_db.iohandler.filename = vel_1.spatialdb
>
> Btw the latest version of PyLith (with dynamic arrays of components)  
> is
> much easier to use than the previous one. The way it interfaces with  
> the
> Cubit generated exodus file and conveniently generates vtk files is  
> also
> nice.
>
> Thanks,
> T
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>

Charles A. Williams
Dept. of Earth & Environmental Sciences
Science Center, 2C01B
Rensselaer Polytechnic Institute
Troy, NY  12180
Phone:    (518) 276-3369
FAX:        (518) 276-2012
e-mail:    willic3 at rpi.edu


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