[aspect-devel] Checkerboard at large scale

[HERON, PHILIP J.]

Hi Lev,

I have had a similar problem in the past and I overcame it by increasing the resolution and playing with the gradient of the influx/out transition. What resolution are you using at the moment, and how is your transition between in and out flow?

Feel free to message me directly as well to try and pick apart the problem.

Cheers

Phil

Philip J. Heron



________________________________
From: Aspect-devel <aspect-devel-bounces at geodynamics.org> on behalf of Lev Karatun <lev.karatun at gmail.com>
Sent: 30 March 2018 03:05:18
To: aspect-devel at geodynamics.org
Subject: [aspect-devel] Checkerboard at large scale

Hi everyone,

I was trying to run some 3-D compression models, but all I'm getting is a checkerboard pattern (see screenshot attached). Boundary conditions are as follows:
left, right walls: influx through the top half, outflux through bottom.
all other walls: free slip.
I tried increasing the resolution but it didn't help. I also thought about decreasing the CFL number but the instability happens at the first timestep, so it doesn't seem relevant. I was wondering if someone faced a similar problem in their research? What did you do to overcome it?

Thanks in advance!

Best regards,
Lev Karatun.
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