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Subject: [Gmsh] (no subject)
Local Time: February 13, 2017 4:23 AM
UTC Time: February 12, 2017 5:23 PM
From: [email protected]
To: [email protected]
Hi All,
I am in the process of learning how to use OneLab. I have a slight grip on
creating geometry and meshing and am now looking for examples of actually using
GetDP. The reason I am posting this message is that I am already realizing the
examples I am looking for are pretty sparse on the Internet.
There are a couple reasons they are sparse:
= What's out there is complex!! Seriously, I am a beginner here. I cannot
handle something like magnetic fields. I think starting with something like the
thermal conduction simulations is probably the simplest but I'm not even sure
what simplicity means in this world of multi-physics simulation.
= As others may know, the whole point of my pursuing this software is for
another piece of software to use it. I am therefore constrained by commands
that can be piped (or typed) through the interface.cpp command line interface.
So, any example that involves "clicking" here or "selecting" there is less
likely to help me out in this endeavor.
Is there something like a metal bar that is hot on one end? A bar being bent?
These other phenomena like magnetism and antennas look fun, but are there
perhaps examples a cave person could comprehend?
Hi Todd,
A fairly simple example of solving a steady boundary value problem may be found
at
https://geuz.org/trac/getdp/wiki/Capacitor2D (username: gmsh, password: gmsh)
It's expressed in terms of electrical capacitance, but if it helps it can be
thought of in terms of a thermal analogy: two plates at ceiling and floor with
different fixed temperatures, the space between filled with a material of one
thermal conductivity except for a circular inclusion of a higher thermal
conductivity. I think the left and right boundary conditions are insulated (in
either the electrical or thermal interpretation).
The partial differential equation in question is Laplace's equation, which is
pretty much the simplest starting place for finite element work.
I don't think I've actually run this one myself. It was back in 2010 that I was
looking at it, so I'd have to dig out old notes to check. I solved the same
problem in FreeFem++ using the Gmsh geometry and mesh and compared my answer
with that from GetDP.
Geordie
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