[aspect-devel] Handing nodes problem

[John Naliboff]

Hi Philip,

I've applied this type of velocity boundary condition to a continental 
extension problem. In a 500 km deep model I had uniform outflow in the 
top 100 km (lithosphere), a gradation from outflow to inflow between 
100-400 km depth and constant inflow in the bottom 100 km.This was all 
done through functions in the parameter file.

The trick typically is to make sure the gradation between in 
inflow/outflow is not too sharp, hence why I did it over a few hundred 
km. You probably also need to be careful with any variations in grid 
resolution.

I believe a few other people have tried something similar with other models.

Let me know if it would be helpful to see the exact function 
implementation I used.

Cheers,
John

*************************************************
John Naliboff
Assistant Project Scientist, CIG
Earth & Planetary Sciences Dept., UC Davis

On 05/22/2017 12:15 AM, HERON, PHILIP J. wrote:
> Going back to Cedric's point, are there any recommendations for applying multidirectional velocities to a boundary? For example, applying a convergent velocity to the lithosphere and a outflow to the asthenosphere (in horizontal 2D models)? I can't see any examples in the cookbooks where such velocities have been applied - has it been done?
>
> I started looking into this a while ago - will have a look where I got to. From what I remember, it was very difficult to transition between horizontal directions and sounds similar to Lev's issues.
>
>
> ________________________________________
> From: Aspect-devel [aspect-devel-bounces at geodynamics.org] on behalf of cedric thieulot [c.thieulot at uu.nl]
> Sent: May 19, 2017 6:17 PM
> To: aspect-devel at geodynamics.org
> Subject: Re: [aspect-devel] Handing nodes problem
>
> Looking at the viscosity field, it kinda looks like suspicious in the darkest red regions, and reminds me of
> simulations whose velocity field is not smooth and converged, thereby leading to anormal element-based strainrate patterns.
> Ce/
>
>
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