[CIG-LONG] StaticBottom

[Matty Mookerjee]

Walter,

I am attaching my input file along with the topo file.

I tried adding StaticLeft but that crashed.  Also, I am not so sure that I want a flux boundary.  The deforming thrust wedge taper needs to be maintained and I fear that the flux boundary will not add material to the back of the wedge in such a way to maintain that taper.  Since it the gravity associated with that taper is an important driving force for the fault motion, I don't want it to be varying unnaturally at the rear of the wedge.

Also, please give me any advice that you might have for removing the background/air component.  The upper surface needs to be a sloping wedge as it is in my input file.

Thank you for your help.  Let me know what you think.

Matty

-----Original Message-----
From: cig-long-bounces at geodynamics.org [mailto:cig-long-bounces at geodynamics.org] On Behalf Of Walter Landry
Sent: Tuesday, April 10, 2012 3:34 PM
To: cig-long at geodynamics.org
Subject: Re: [CIG-LONG] StaticBottom

Matty Mookerjee <matty.mookerjee at sonoma.edu> wrote:
> Hello all,
> 
> I am having some difficulty with a model and implementing 
> StaticBottom.  I am using a SurfaceAdaptor to define the bottom of my 
> model and then I am imposing a velocity boundary condition to one side 
> of my model in the hopes of moving material over this irregular bottom 
> surface.  Unfortunately, the bottom is moving along with the material.  
> I tried defining "StaticBottom": "True in EulerDeform, but that seems 
> to have no effect.
> 
> Any advice?

The example in

  input/cookbook/fixed_bottom.json

does this kind of thing.  Maybe you are forgetting StaticLeft?  If you are trying to actually move the side of the model, then will be more tricky.  Do you need to do that?

> Another issue is that as the model is configured currently, there is 
> air above the deforming material.  Because the air has such weak 
> properties, the strain within the air dwarfs the strain accumulating 
> in the solid material.  Can I run the model with no air/background 
> rheology?  So far any attempts to do this have resulted in a 
> segmentation fault.

You should not have to have an air layer.  The cookbooks have deforming surfaces but none of them use air layers. Could you send the input file?

Cheers,
Walter Landry
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