[FLASH-USERS] conserve variable...

[Cristian Giovanny Bernal]

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


-------------- next part --------------
A non-text attachment was scrubbed...
Name: mass_hydro_10E28.ps
Type: application/postscript
Size: 2231864 bytes
Desc: not available
URL: <http://flash.rochester.edu/pipermail/flash-users/attachments/20080709/f105fb0f/attachment.ps>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: mass_mhd_10E28.ps
Type: application/postscript
Size: 2416020 bytes
Desc: not available
URL: <http://flash.rochester.edu/pipermail/flash-users/attachments/20080709/f105fb0f/attachment-0001.ps>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: dens_cheva_hydro_mhd_bucle.gif
Type: image/gif
Size: 357427 bytes
Desc: not available
URL: <http://flash.rochester.edu/pipermail/flash-users/attachments/20080709/f105fb0f/attachment.gif>