[Geoqus] Ask two questions

[Shiyuan Li]

Dear Daniel Kurfess:
Thanks so much for your help, and I also did shear test ,I want to ask you that if the gravity is taken into consideration, because what I do is the sinking of a ball in a Newtonian-fluid, and if the gravity loading is taken into consideration, the elasticity of the Newtonian-fluid will have a big effect. So whether do you have such an experience?

The question 'a' means the if the Power Law Multiplier 'A' is a variable due to different temperature which is distributed in vertical direction, whether and how to define a subroutine file, whether do you have such an experience.

Hopr your reply!
Shiyuan

----- Original Message -----
From: Daniel Kurfeß <daniel.kurfess at gpi.uni-karlsruhe.de>
Date: Thursday, May 15, 2008 1:07 pm
Subject: Re: [Geoqus] Ask two questions
To: geoqus at lists.ruhr-uni-bochum.de

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> Dear Shiyuan Li,
> Dear Geoqus list reader (maybe this is of general interest),
> 
> As I tested such things a bit by myself, I can share my experiences 
> withyou. Look at the simple test file I attached to this e-mail, 
> especiallythe comments inside the input deck. The results fit quite 
> well the
> expectations for a "simple shear test" of a Newtonian fluid, except 
> someboundary effects.
> 
> Pay very much attention to the CETOL parameter. Using CREEP 
> behavior for
> geoscientific problems and the corresponding material parameters is 
> verytricky, and -- in my opinion -- often misused, because with the 
> CETOLtolerance parameter chosen great enough, you can get nearly every
> result. Choose CETOL that small that decreasing it by another order of
> magnitude won't change the result. This is very often not 
> considered, as
> it may increase computation time drastically.
> 
> Maybe this will help you a bit. Good luck! :-)
> 
> Cheers,
> Daniel
> 
> 
> PS: What is the "question" behind item a.? ;-)
> 
> 
> Shiyuan Li wrote:
> > Dear group members : I am a new PhD student in structural geology 
> and> geomechanics group followed with J.Urai in RWTH.
> > 
> > Now I use Abaqus to simulate the rheology of salt, and during the
> > process I have two questions:
> > 
> > a. The power-law amplitude parameter A is a variable of temperature
> > which is linearly distributed in space position, and I try to 
> write a
> > fortran file to define myself. but it is not easy for me.
> > 
> > b. Salt is viscosity material, but in material property, it seems
> > that elasticity must be given then creep can be calculated, but the
> > result does not obey the rule of newtonion fluid flow with pure 
> creep> (no elasticity).
> > 
> > I am indeed in a trouble. Many thanks! Best Regards! Shiyuan Li May
> > 14, 2008 _______________________________________________ Geoqus
> > mailing list Geoqus at lists.ruhr-uni-bochum.de 
> > http://lists.ruhr-uni-bochum.de/mailman/listinfo/geoqus
> > 
> 
> 
> - --
> Daniel Kurfeß
> 
> Universität Karlsruhe (TH) - Geophysikalisches Institut
> Hertzstraße 16, 76187 Karlsruhe, Germany
> 
> email: daniel.kurfess at gpi.uni-karlsruhe.de
> phone: +49-721-608-4492
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