[CIG-LONG] Low viscosity material around dike

[Taichi SATO]

Dear Walter and Guillaume,

Thank you very much and I am sorry I cannot response quickly.

Guillaume,
I could understand the scaling law of the NonNewtonian in Gale and can 
use values from the papers. Thanks a lot!

Walter,
I submerged the dike 1000 and 2000 m deep from the surface,  but after 
several time steps proceed, the dike hill appears.

Sincerely,

Taichi

(2010/05/09 8:21), Guillaume.Duclaux at csiro.au wrote:
> In the literature A is usually expressed in MPa^(-n).s^(-1), consequently it need to be scaled:
>
> Agale= A^(1/n)*timeScalingFactor^(1/n)
>
> I've been using values from Ranalli 1997, and for a quartz, A=1e-3 MPa^(-n).s^(-1), n=2, Ea=167 kJ.mol^(-1). No 1e-16 in my recent scripts, though.
>
> Attached is a basic scaling spreadsheet I prepared for scaling the input parameters for the NonNewtonian viscosity implementation in Gale.
> How it works: Fill the cells in orange (Edot, n, scalingFactor, A, Ea) and get T_0 and A_Gale (in red) scaled for the input file...
> Use it at your own risks! I don't guarantee the correctness of the script.
> If you still want to use it and find an error, please let me know ;)
>
> Cheers
>
> Gilly
>
> ________________________________________________
>
> Dr Guillaume Duclaux
> CSIRO Earth Science and Resource Engineering
> Visiting address: ARRC, 26 Dick Perry Av., Kensington WA 6151
> Postal address: PO Box 1130, Bentley WA 6102, Australia
> Ph: + 61 8 6436 8728    Fax: + 61 8 6436 8555    Web: www.csiro.au
>
>
> -----Original Message-----
> From: cig-long-bounces at geodynamics.org [mailto:cig-long-bounces at geodynamics.org] On Behalf Of Walter Landry
> Sent: Saturday, 8 May 2010 7:18 AM
> To: cig-long at geodynamics.org
> Subject: Re: [CIG-LONG] Low viscosity material around dike
>
> <Guillaume.Duclaux at csiro.au>  wrote:
>    
>> Folks,
>>
>> I'm currently out of office and I didn't bring my scaling scripts
>> with me... The NewNewtonian rheology in Gale implies some scaling
>> (in order to obtain an effective viscosity of the order of one), you
>> can't directly use values from the literature.
>>      
> The scaling for A is fairly straighforward.  The units for A are
> 1/viscosity, so you scale A inversely to what you scale viscosity.
> What I do not know (and what I think Taichi is asking) is where did
> the original numbers come from.  What is the original paper that you
> got the numbers from?  Presumably people will want to use their own
> numbers for their own runs, but it would be nice to know where the
> example numbers come from.
>
> Thanks,
> Walter Landry
> walter at geodynamics.org
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