[Nek5000-users] Magnetic boundary conditions (especially (quasi) vacuum conditions)

[nek5000-users at lists.mcs.anl.gov]

Hi Jan,

Sounds exciting!

As a first step, we have implemented the quasi vacuum boundary/idealized insulator conditions for the boundary aligned with the Cartesian axes -- e.g., use the cbc/genbox character 'ddn' in .rea for Dirichlet conditions on the first two components, Bx & By (with vx=0 & vy=0 for ifield.eq.ifldmhd in userbc) and for homogeneous Neumann on the third, i.e. for dBz/dz=0.

I have started debugging its extension for the general case.

I am currently tied up with the end of the year projects but I am hopeful that I'll get back to it over the Christmas break.

Let me know if you have any questions.
Thanks.
Aleks


----- Original Message -----
From: nek5000-users at lists.mcs.anl.gov
To: nek5000-users at lists.mcs.anl.gov
Sent: Thursday, December 12, 2013 8:47:29 AM
Subject: [Nek5000-users] Magnetic boundary conditions (especially (quasi)	vacuum conditions)

Hello everyone,
I just started using Nek5000 and my group is currently thinking about 
using the code to simulate a precession driven dynamo in a ellipsoidal 
shell. For this, we would need to run an MHD Simulation with vacuum or 
quasi vacuum boundary conditions (the code we used so far used quasi 
vacuum conditions). Has anyone experience with implementing either of those?
I found an older post 
(http://lists.mcs.anl.gov/pipermail/nek5000-users/2011-July/001416.html) 
that mentioned bc's for the magnetic field that are different from the 
velocity conditions, but could not find any update on this.

Best whishes,
Jan
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