[CIG-LONG] CIG-LONG Digest, Vol 45, Issue 18

[Nicolas RIEL]

Hi

Do you have an air layer at the top of your model ? This can also come from
the viscosity of your air layer, it needs to not be the lower viscosity of
your model, or your model will focus on the air deformation...
I had the same problem of converging when my resolution is high. Most of
time it comes from viscosity scaling. The order of magnitude supported by
gale is around 1e5 to 1e6 (Patrice Rey), so if you are using non-newtonian
rheology or/and yielding you need to fix the min and max viscosity for these
rheology to stay within the order magnitude of viscosity supported.
I had also this kind of problem when the hydrostatic term is not well set.

I hope this can help you !

Nicolas Riel

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>
> Message: 2
> Date: Wed, 25 Aug 2010 16:35:29 -0500
> From: Dian He <hedian18 at gmail.com>
> Subject: [CIG-LONG] Convergence problem
> To: cig-long at geodynamics.org
> Message-ID:
>        <AANLkTi=BSLY-GeNfAL8gM-k8ypF4WK=3zdBpgvWxzhZW at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi there,
>
> When I run models, I have always encountered the problems that the
> solutions
> can not be converged at some (usually hundreds of) time steps, even I
> change
> kinds of parameters. I want to see some results after tens Myr, but they
> were stopping at just several Myr. The more strange thing is that, for one
> case, it can only run for a certain resolution of the mesh. It doesn't run
> one step at all if I change the resolution of the mesh or particles.
>
> Another question is that the temperature structure is reset if I restart
> the
> running from some step, but the geometry and velocity seem to continue.
>
> Thanks,
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