[FLASH-USERS] 2D Spherical and Cartesian Geometry
Klaus Weide
klaus at flash.uchicago.edu
Fri Sep 23 09:29:26 EDT 2016
On Fri, 23 Sep 2016, Michiel Bustraan wrote:
> Firstly, I've been trying to run a simulation in 2D with a spherical geometry, but a few steps after starting the simulation the code crashes due to a negative dt.
>
> I set the density and temperature constant in the simulation, and the velocity to 0, so nothing should be happening (just as a test case).
>
> I'm attaching a plot of the density just before the crash. I'm guessing the problem lies in the grid somewhere, but I have no idea how to fix it.?
>
>
> Have any of you encountered something like this before?
Michiel,
It is not so unusual to see some sort of instabilities developing close to
the axis in 2D spherical coordinates, but FLASH should be able to do
better than THAT.
Wee need more information to understand what may be going on. To start
with, are you using the latest release version of FLASH? Which hydro
solver are you using? What was your setup command?
How have you set the geometry to 2D spherical? How have you set related
runtime parameters, in particular, ymin, ymax, and all boundary
conditions?
Klaus
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