[CIG-SHORT] pylith time stepping

[Charles Williams]

Hi Chris,

At present, the automatic time stepping is controlled purely by the  
Maxwell time (for viscoelastic materials).  Since the current  
viscoelastic materials are all linear, the time step size is  
independent of the deformation rate.  Once we include nonlinear  
materials (e.g, power-law rheology), this will no longer be true.

We will have to look at the second thing you mention.  I don't think  
we had noticed that before.

Thanks,
Charles


On 12/05/2009, at 3:55 PM, Christopher DiCaprio wrote:

> Hi,
>
> It's not clear to me what is supported for the nonuniform, automatic
> time stepping. The release notes for 1.3.0 say "For the current bulk
> constitutive models, the automatically determined time step is
> independent of the deformation rate, so it is uniform."
>
> The release notes for 1.3.1 don't mention time stepping, but the
> manual implies that there is support for non-uniform time steps.
>
> One other thing: when using nonuniform, automatic time stepping, the
> *_info.vtk files are overwritten with what should go in the
> *_t0000.vtk files. This doesn't happen when using user-specified time
> stepping.
>
> Thanks,
> Chris
>
>
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Charles A. Williams
Scientist
GNS Science
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Lower Hutt  5040
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C.Williams at gns.cri.nz
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