[CIG-LONG] Scaling from SI values

[Laetitia Le Pourhiet]

OOOPS, exept I just realise there is a mistake in table 2
velocity and Length are mismatch... I double check rest is correct...
nobody's perfect... neither me, my co-authors or the peer-review process :)
Sorry for distrubing you all... on the list but I prefer these 2 message to
be back to back in the mailing list
L.

On Thu, Aug 8, 2013 at 5:58 PM, Laetitia Le Pourhiet <zlolita at gmail.com>wrote:

> thermal diffusivity  K or Kappa for rocks is 1e-6 m^2s-1
> I think you mismatched with thermal conductivity k (as in Fourier law)
> which is around 2-3 SI
> Kappa = k/rho/cp  (density and thermal capacity )
> you should not follow the manual ... for scaling time, it is good to have
> viscosity close to 1 but your timescale should be close to the
> characteristic timescale of what you actually want to model...  ie. 1e13-15
> but not 22...
>
> I described some scaling that works well for long term geology
> application  in my paper at G3
> look at table 2 in
>
> http://www.researchgate.net/publication/235005010_Kinematic_interpretation_of_the_3D_shapes_of_metamorphic_core_complexes/file/79e41510410cb3a769.pdf
>
> hope it helps
> Laetitia
>
>
>
> On Thu, Aug 8, 2013 at 1:52 PM, Matthias Schmiddunser <
> matthias.schmiddunser at uni-tuebingen.de> wrote:
>
>> Hi all,
>>
>> I have a problem concerning the correct scaling of values for the use in
>> Gale. Is there a "recipe" on how to scale the values, starting from known
>> SI units?
>>
>> I want to model compression with temperature-dependent viscosity. The
>> viscosity is in the order of 10^22, so I scaled time as s -> 10^22 s and
>> mass as kg -> 10^44 kg, as described in the manual. For the thermal
>> diffusivity this means a value of 1 W/K*m becomes 10^22. However, in my
>> model I get a weird layered temperature structure, with values oscillating
>> between the values I set for the bottom and the top once per cell (see
>> attached picture). I assume this is due to the too high value of
>> diffusivity, but maybe I'm misunderstanding something basic. Any help would
>> be deeply appreciated!
>>
>> Thank you very much,
>>
>> Matthias
>>
>> --
>> Matthias Schmiddunser
>> Department of Geosciences
>> University of Tübingen
>> Wilhelmstrasse 56
>> D-72074 Tübingen
>>
>> E-Mail: matthias.schmiddunser at uni-**tuebingen.de<matthias.schmiddunser at uni-tuebingen.de>
>> Telephone: +49(7071)29-73157
>>
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>>
>
>
>
> --
> Laetitia Le Pourhiet
>
>


-- 
Laetitia Le Pourhiet
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