[FLASH-USERS] conserve variable...

[Shawn Needham]

Pushing this email through was an error on my part. I noticed the month 
and day of this post and thought it was a day old as opposed to a year 
old and approved it.

Dongwook and Cristian already had an off list exchange that addressed the 
questions in the post below:

Here is the original post from the archive.

http://flash.uchicago.edu/pipermail/flash-users/2008-July/002862.html

Apolgies,
Shawn
On Wed, 9 Jul 2008, Cristian Giovanny Bernal wrote:

> Hi people,
>
> I have a question. The module MHD of Flash2.5 conserve the variables (like the mass)?
> I am running a simulation with a rate of injection of  mass constant by one of the boundaries (Yr).
> The other boundaries are periodic (Xl, Xr) and reflecting (Yl).
> I have two setups (HYDRO & MHD) with exactly the same physic and boundary condition.
> Nevertheless, when I plotting the flash.dat (using 1:2 "mass Vs time"), I see that HYDRO_setup
> conserve the mass in the dominion (see the attached plot), but MHD not. I do not why! The magnetic
> field affect the conservation of the variables?
>
> I set the conserved_var   = .true. in the flash par, but the result is the same.
>
> I see that the dens_profile_MHD is like HYDRO, but with less mass... the injection stays (the red is a
> analitical solution in the plot).
>
> The physics used are: gravity (planepar), EOS (Helmholtz), neutrinoloss (a modified version of
> radloss), Hydro and MHD. Cartesian coordinates are used in 2D.
>
> any idea??? The FLASH3.0 also suffers from this?
>
> very thanks for your help...
>
>
>
> -- 
> Instituto de Astronomia
> Universidad Nacional Autonoma de Mexico (UNAM)
> http://www.astroscu.unam.mx
>
>
>