[Users] error when I trying to add atmosphere to BBH evolution

[赵志超]

Thank you Ian Hinder.

Yes I want to add a low density fluid to a BBH simulation.

I review the source code of GRHydro_InitialData Thorn's
GRHydro_OnlyAtmo.F90 .  I found it give any position ( I mean every
nx,ny,nz) a rho value which is a constant equal to "rho_abs_min" or
"initial_rho_abs_min".

so I think it can give a low density fluid to a BBH simulation.

But it report "NAN" or "Con2Prim: count > GRHydro_countmax".

Thank again.

Yours
Zhi-Chao.

2017-08-18 21:54 GMT+08:00 Ian Hinder <ian.hinder at aei.mpg.de>:

>
> On 17 Aug 2017, at 09:57, 赵志超 <yanyuechuixue at gmail.com> wrote:
>
> Hello everyone,
>
> I am studying how to use Einstein_toolkit, I want to try to add atmosphere
> to a BBH evolution.
> I add the below things to BBHLowRes.par in the par dir.
> However, it reports "nan" error soon after the beginning of evolution.
> I do not know how to correct it.
> Could anyone give me some suggestion?
>
>
> Hi,
>
> Could you give more details about the physics you are trying to add?
>  "atmosphere" in this context usually means an artificial low density fluid
> in a matter simulation which helps with numerical problems that occur when
> the density drops to zero.  It doesn't make sense to add it to a BBH
> simulation, which is vacuum.
>
> Do you mean that you want to add a low density fluid to a BBH simulation?
>
> --
> Ian Hinder
> http://members.aei.mpg.de/ianhin
>
>


-- 
赵志超
中国科学院高能物理研究所
中国 北京
18401696963
yanyuechuixue at gmail.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.einsteintoolkit.org/pipermail/users/attachments/20170818/0dae2608/attachment.html