[FLASH-USERS] Unsupported boundary condititions

[Anshu Dubey]

The multigrid solver in FLASH is for an elliptic equation, outflow
boundaries make no sense for this equation.

Anshu

On Wed, May 7, 2008 at 8:49 AM, Josef Stöckl <josef.stoeckl at uibk.ac.at>
wrote:

>  Hi,
>
> As a follow up question: Is there any specific reason that the Multigrid
> solver doesn't handle "outflow" boundaries (e.g. is it intended) or could it
> be implemented?
>
> Thanks and best regards,
> Josef
>
> Josef Stöckl wrote:
>
> Hi Anshu,
>
> Yes, I'm indeed using the Multigrid solver. I didn't find any mention of
> this solver not working with "outflow", but I'll have to check again. I
> wonder though, isn't "grav_boundary_type" the boundary condition used for
> the self gravity? Because I had set that to "periodic" for my initial tests.
>
> Thanks and best regards,
> Josef
>
>
> Anshu Dubey wrote:
>
> It appears that you are using the multigrid solver for gravity in your
> simulation.
> Self gravity in FLASH does not support outflow boundary conditions, most
> of the
> other solvers do. From the setups included with the distribution you can
> check out
> "Sod" and "Sedov", they both use outflow boundary conditions.
>
> Anshu
>
> On Wed, May 7, 2008 at 7:04 AM, Josef Stöckl <josef.stoeckl at uibk.ac.at>
> wrote:
>
> Hi,
>
> I'm trying to set up a problem with "outflow" boundary conditions, but
> when I choose this BC type I always get the following message in my log:
> gr_hgMapBcType: An unexpected gr_hgBndConditions was requested for the
> WORK array
>
> Looking inside that file seems to suggest that at the moment only a few
> boundary conditions are implemented and not all, which the Flash 3 Manual
> lists. Is there some development version of the Grid code available that
> handles outflow conditions?
>
> Thanks in advance and best regards to all,
>
> Josef
>
>
>
>
>
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