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

Fri Oct 15 07:21:58 PDT 2010

Hi Walter,
I attached you a basic input file with temperature diffusivity problems.
The model is made of one sphere in middle of a square of 1000m².
Diffusivity is set at 1e20, temperature of the sphere is 500K whereas in the
square temperature is 300K.

Cheers,

Nicolas RIEL

On Thu, Oct 14, 2010 at 8:32 PM, <cig-long-request at geodynamics.org> wrote:

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> Today's Topics:
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>   1. Re: CIG-LONG Digest, Vol 47, Issue 1 (Nicolas RIEL)
>   2. Re: CIG-LONG Digest, Vol 47, Issue 1 (Walter Landry)
>   3. Re: Thermally driven counterflow (Walter Landry)
>
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 14 Oct 2010 00:06:57 +0200
> From: Nicolas RIEL <nicolas.riel at free.fr>
> Subject: Re: [CIG-LONG] CIG-LONG Digest, Vol 47, Issue 1
> To: cig-long at geodynamics.org
> Message-ID:
>        <AANLkTin0_ow_aiEhOCvxm=-fKP7FpYz96iCGU1C=OU_p at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi everyone !
> I'm actually working on a very simple model. I'm trying to simulate thermal
> conductivity in a two layers system with high temperature at the bottom.
> However I noticed that thermal conductivty (Diffusity term in Gale) seems
> to
> need a model thickness scaled to 1, to work properly.
> If I do not scale the maxX, maxY to a value of 1 the temperature profile
> becomes totally unlikely with development of small unrealistic horizontal
> gradient of temperature (With temperature decreasing to values below 273K
> !)
>
> Do you have any ideas about that ?
>
> Cheers
>
> Nicolas Riel
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> ------------------------------
>
> Message: 2
> Date: Wed, 13 Oct 2010 15:11:21 -0700 (PDT)
> From: Walter Landry <walter at geodynamics.org>
> Subject: Re: [CIG-LONG] CIG-LONG Digest, Vol 47, Issue 1
> To: cig-long at geodynamics.org
> Message-ID:
>        <20101013.151121.383456029673834155.walter at geodynamics.org>
> Content-Type: Text/Plain; charset=us-ascii
>
> Nicolas RIEL <nicolas.riel at free.fr> wrote:
> > Hi everyone !
> > I'm actually working on a very simple model. I'm trying to simulate
> thermal
> > conductivity in a two layers system with high temperature at the bottom.
> > However I noticed that thermal conductivty (Diffusity term in Gale) seems
> to
> > need a model thickness scaled to 1, to work properly.
> > If I do not scale the maxX, maxY to a value of 1 the temperature profile
> > becomes totally unlikely with development of small unrealistic horizontal
> > gradient of temperature (With temperature decreasing to values below 273K
> !)
>
> You should not have to scale the model thickness.  Can you send the
> input file that exhibits these problems?  That would give me something
> more concrete to work with.
>
> Cheers,
> Walter Landry
> walter at geodynamics.org
> e
>
>
> ------------------------------
>
> Message: 3
> Date: Thu, 14 Oct 2010 11:29:13 -0700 (PDT)
> From: Walter Landry <walter at geodynamics.org>
> Subject: Re: [CIG-LONG] Thermally driven counterflow
> To: cig-long at geodynamics.org
> Cc: karen.paczkowski at yale.edu
> Message-ID:
>        <20101014.112913.1461306830742164609.walter at geodynamics.org>
> Content-Type: text/plain; charset="us-ascii"
>
> Walter Landry <walter at geodynamics.org> wrote:
> > Karen Paczkowski <karen.paczkowski at yale.edu> wrote:
> >> Hi,
> >>
> >> Thank you for all the help.  I am unfortunately still getting a very
> >> unexpected flow field.  The only velocities I have set are:
> >>
> >> Vx = 0 and Vy = -Vslab on the left side
> >> Vy=0 across the top
> >>
> >> My input file is producing a flow field that flows in the opposite
> >> direction as Vslab (up and to the right) and has a magnitude 2-3
> >> orders of magnitude larger than Vslab.  This was not occurring prior
> >> to adding the thermal field, so I am assuming it has to do with that,
> >> but I'm really not sure what is causing this exactly.  I have attached
> >> a picture of the velocity field and a copy of the input file.  It is
> >> written for Gale 1.5.0.  I would really appreciate any advice.
> >
> > The problem is that there is no maximum temperature in the
> > HydrostaticTerm.  I am on vacation until September, so I will not be
> > able to get to it until then.
>
> Sorry for the long delay, but I finally implemented this.  You can get
> the code from the repository.  I am attaching a new input file and a
> picture of the velocity and temperature.  Please let me know if you
> have any more questions.
>
> Cheers,
> Walter Landry
> walter at geodynamics.org
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