[FLASH-USERS] examples of inputing an initial model?

[Robert Fisher]

Hi Eddie :

   It's possible to interpolate the particles into 3D and then
angle-average over azimuthal angle to get your desired r-z 2.5D mesh.
However, in a paper I wrote with my students and colleagues, we developed
an elegant way to interpolate directly into 2D axisymmetry. The method is
described in an appendix. I am going to quote myself here :

"However, a more elegant and efficient method, which we adopt, is to break
up the angle-dependent quantities, which involve only the smoothing kernel,
from the particle data. This reduces the angle-averaging procedure to
simple quadrature, with the weights written as integrals to be
pre-tabulated once. The averaged quantities are then rapidly and
efficiently calculated by weighting the particle data at each point on the
r-z mesh over lookups of the pre-tabulated weights."

The paper is

http://iopscience.iop.org/article/10.1088/0004-637X/773/2/136/meta#apj478831app1

You can also write to me offline and we can share the relevant source code.

  Best wishes,

  Bob


On Wed, Dec 7, 2016 at 4:44 PM, Hix, William Raphael <raph at ornl.gov> wrote:

> Hi Eddie-
>
> There is a tool SPLASH, intended for visualizing SPH data that may help,
> since mapping to pixels is similar to mapping to grids.
>
> http://users.monash.edu.au/~dprice/splash/
>
>                                 Raph
>
> > On Dec 7, 2016, at 4:40 PM, Baron, Edward A. <baron at ou.edu> wrote:
> >
> >
> >
> > I am trying to take the output of a model calculated with SPH and use it
> as an initial model for a  FLASH run.
> >
> > Can anyone point me to documentation on how to define initial physical
> values at each grid point?
> >
> > This must be common (the results of 1-D hydrostatic equilibrium runs are
> often input), etc. But somehow I’m not finding the docs on how to set the
> initial values in FLASH.
> >
> > I need to use the MHD solver for so I can run 2.5D (including rotation),
> these are pure hydro, just need the 2.5D capability (and also treatment of
> viscosity).
> >
> > Any help with this would be greatly appreciated.
> >
> > -eddie
> >
>
>


-- 
Dr. Robert Fisher
Associate Professor / Graduate Program Director
University of Massachusetts/Dartmouth
Department of Physics
285 Old Westport Road
North Dartmouth, Massachusetts 02747
robert.fisher at umassd.edu
http://www.novastella.org
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