[CIG-SHORT] TimeStepAdapt

[Ekaterina Bolotskaya]

Dear Bing,

I'm sorry for emailing the whole mailing list, but I was trying to model similar things with Pylith and I faced the same issue with the time step.
I tried setting the time-step directly as Brad suggested, but it wasn't successful (too much refining necessary and I had to rerun the model after each refinement to see where the instability is and to refine again). I have moved to some other software recently, but I'm not sure yet if it will be capable of resolving the time step issue.
Could you send me a personal email please (bolee at mit.edu)? I would be very interested to talk to you about this and and your opinion is on how to proceed on this.

Thanks!


Best regards,
Ekaterina Bolotskaya

PhD Candidate in Geophysics,
Earth, Atmospheric and Planetary Science Department,
Massachusetts Institute of Technology
E-mail. bolee at mit.edu
Mob. +1 (857) 284-2805<tel:%2B1%20%28857%29%20284-2805>
         +7 (963) 995-36-33<tel:%2B7%20%28963%29%20995-36-33>
________________________________
From: CIG-SHORT [cig-short-bounces at geodynamics.org] on behalf of Brad Aagaard [baagaard at usgs.gov]
Sent: Wednesday, September 26, 2018 22:54
To: cig-short at geodynamics.org
Subject: Re: [CIG-SHORT] TimeStepAdapt

The adaptive time stepping is limited to cases where the bulk rheology provides information about what is an appropriate time step. Currently, the only bulk rheologies that do this are the linear Maxwell, generalized Maxwell, and powerlaw rheologies. The fault constitutive models do not currently provide information about a stable time step. There is a hook for doing this and we would welcome user contributions for implementing this.

You can set the time step directly as a function of time (assuming you know when you want smaller time steps) using TimeStepUser.

Regards,
Brad

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