[CIG-LONG] Fwd: CIG-LONG Digest, Vol 47, Issue 2

Guillaume.Duclaux at csiro.au Guillaume.Duclaux at csiro.au
Tue Oct 19 02:20:43 PDT 2010

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From: "Duclaux, Guillaume (CESRE, Kensington)" <Guillaume.Duclaux at csiro.au<mailto:Guillaume.Duclaux at csiro.au>>
Date: 19 October 2010 5:14:17 PM AWST
To: Walter Landry <walter at geodynamics.org<mailto:walter at geodynamics.org>>
Subject: Re: [CIG-LONG] CIG-LONG Digest, Vol 47, Issue 2


But, shouldn't it be possible to solve purely thermal problem with Gale?  (let's pretend the thermal expansion is null is Nicolas' problem).
ie a sill at a temperature of 1000 K has intruded a mass of rock at constant temperature (600 K) and I want to simulate the thermal evolution of the system as I change the thickness of the dyke or the radiogenic heat production of one or the other material.

To ensure the solver timestepping is not missing the temperature perturbation timescale, how should the time be scaled?
I guess viscosity doesn't matter if the problem is purely thermal, but as soon as the thermal expansion is on, some body forces act too creating some 'slow' displacement.

On 19/10/2010, at 4:47 PM, Walter Landry wrote:

<Guillaume.Duclaux at csiro.au<mailto:Guillaume.Duclaux at csiro.au>> wrote:
Should be something like
1e-5 m2/s-1

In that case, the timescale for thermal equilibrium is much faster
than anything else.  The velocity magnitude of 4.5e7 becomes
4.5e-18 m/s = 1.4e-8 cm/year, which is a bit slow.  So he is presumably
interested in a different problem with higher velocities?

Walter Landry
walter at geodynamics.org<mailto:walter at geodynamics.org>
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