[aspect-devel] Handing nodes problem

[HERON, PHILIP J.]

Hi John,

Thanks for the message. I hadn't tried such an extreme gradation of 300km - I think I stopped at about 100 km - but I will give that a go. Thanks for the advice.

Cheers,

Phil


________________________________
From: Aspect-devel [aspect-devel-bounces at geodynamics.org] on behalf of John Naliboff [jbnaliboff at ucdavis.edu]
Sent: May 22, 2017 5:21 PM
To: aspect-devel at geodynamics.org
Subject: Re: [aspect-devel] Handing nodes problem

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<mailto:aspect-devel-bounces at geodynamics.org>] on behalf of cedric thieulot [c.thieulot at uu.nl<mailto:c.thieulot at uu.nl>]
Sent: May 19, 2017 6:17 PM
To: aspect-devel at geodynamics.org<mailto: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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