[FLASH-USERS] External forcing

[Christoph Federrath]

Dear Andrea, Norbert, Bob,

the most recent version of the stirring module includes a proper decomposition into solenoidal and compressible modes and is available in the current FLASH release. See the User Guide, Sections "16.3.2 Stir Unit: FromFile Implementation", Section "16.3.3 Using the StirFromFile Unit", and Section 16.3.4 Stirring Unit Test:
http://flash.uchicago.edu/site/flashcode/user_support/flash4_ug_4p2.pdf

The relevant paper for this driving module is:
http://adsabs.harvard.edu/abs/2010A%26A...512A..81F

Please let me know if you have any questions about this implementation.

Kind regards,

Christoph


________________________________
Dr. Christoph Federrath
Monash Centre for Astrophysics,
School of Mathematical Sciences,
Monash University,
Clayton, VIC 3800, Australia
+61 3 9905 9760
http://www.ita.uni-heidelberg.de/~chfeder/index.shtml?lang=en


Am 29.04.2014 um 08:31 schrieb Robert Fisher:

> Dear Andrea, Norbert :
> 
>   StirTurb does stochastic driving, including the forcing contribution in an operator-split fashion to both the momentum and energy equations for long-wavelength, low-wavenumber waveband. Please see this paper for a more in-depth description:
> 
> http://iopscience.iop.org/1402-4896/2008/T132/014046/
> 
> This approach may be modified substantially to handle a forcing function with arbitrary space and time dependence. Please feel free to contact me for more information.
> 
>   Best wishes,
> 
>   Bob 
> 
> 
> On Tue, Apr 29, 2014 at 11:24 AM, Norbert Flocke <flocke at flash.uchicago.edu> wrote:
> Hi Andrea,
> 
> I am not an expert in this, but I recall something similar is done in the Stir Unit. Please have a look at the FLASH User's guide under section 16.3. I think an external force is introduced into the MHD to simulate stirring.
> 
> Hope this helps,
> Norbert
> 
> 
> 
> On Tue, 29 Apr 2014, andrea costa wrote:
> 
> Dear all,
> 
> we need to add an external forcing in an MHD simulation.
> The external force must be space and time dependent
> Can someone  tell me how to implement this problem
> thanks in advance
> andrea
> 
> -- 
> Dr. Robert Fisher
> Assistant Professor
> University of Massachusetts/Dartmouth
> Department of Physics
> 285 Old Westport Road
> North Dartmouth, Massachusetts 02747
> robert.fisher at umassd.edu
> http://www.novastella.org