[FLASH-USERS] v cycle not converging

[Anshu Dubey]

Dear Latif,

If you are new to FLASH, I strongly recommend using FLASH 3 instead of FLASH
2.5
There is new multigrid algorithm in FLASH3 which is not only more
efficient,  but is
also better known by the current support team. You will get much better
support
in general.

Anshu

On Tue, Apr 29, 2008 at 12:57 PM, M.A. Latife <latife at astro.rug.nl> wrote:

> Hi,
> Dear All.
> First of all sorry for disturbing you again. i am not good in using flash
> .  i am asking  many questions hope you will not mind.
> i am simulating structure formation using FLASH 2.5 starting from redshift
> 25(Hydro+gravity+cosmology).
> when i put uniform density over whole domain. i get warning v-cycle not
> converging and results become worse. i am using periodic boundary conditions
>  both for hydro+ gravity.
> when i put over density at center (like Gaussian or Mexican hat) minimum
> density becomes small than it should be at particular redshift( like it
> becomes 1.0E-30 at redshift 15) although density should remain constant.
> My 2nd question is when is when using cosmology should i use comoving
> coordinates when initializing conditions in initial block. if yes then how?.
> i am taking  block centres and dividing them by scale factor in Initial
> block .
> any suggestions in this regard will be highly appreciated.
> Kind regards
> Latif
>
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