[FLASH-USERS] Question about star formation using FLASH

[Seyit Hocuk]

Hi Everybody,

I am this colleague everyone speaks of. As of today I am a listed to the 
flash-users and can reply myself. First of All, thanks to everyone who 
has answered in such a short notice and have helped me very much. It's 
very appreciated. I will now sink my teeth into Flash and try to learn it.

Robi: I am glad that you are working on this and yes I am willing to 
wait a while. It would be great if I could implement your work indeed.

Bob: Thanks for the usefull link

John Z: Thanks

Cheers,
Seyit



Robi Banerjee wrote:
> Dear M.A.
>
> we have a simple implementation of 'sink partciles' (ie. particles
> which are created on the fly and are able to accrete gas) for the
> FLASH code. We are currently finalizing our work and will publish it
> soon describing some test cases.
>
> If your colleague is willing to wait a while, we can assist him
> implementing our approach. You can find the outline of our idea
> in a talk I gave at the FLASH workshop in Bremen:
> http://www.ita.uni-heidelberg.de/~banerjee/talks/FLASH_Workshop.ppt
>
> Cheers,
> Robi
>
> ======================================
> Robi Banerjee
> Institut für Theoretische Astrophysik
> Universität Heidelberg
> Albert-Ueberle-Str. 2
> 69120 Heidelberg
> Germany
> e-mail: banerjee at ita.uni-heidelberg.de
> URL   : http://www.ita.uni-heidelberg.de/~banerjee
> tel.  : +49 6221 54-8967
> fax   : +49 6221 544221
>
> On Thu, 31 Jan 2008, Robert Fisher wrote:
>
>>
>> To elaborate upon what John has stated, star particles like those you 
>> have described have not been implemented into FLASH. However, FLASH 
>> does support active, gravitating particles, so the addition of such a 
>> feature would be relatively straightforward -- the algorithm has 
>> already been fully laid out, for instance in Krumholz et al (2004) --
>>
>> http://adsabs.harvard.edu/abs/2004ApJ...611..399K
>>
>> I am certain your colleague could obtain assistance where needed from 
>> both the FLASH code group and the user community.
>>
>>  Best wishes,
>>
>>  Bob
>>
>> On Thu, 31 Jan 2008, John ZuHone wrote:
>>
>>> Hello M.A.,
>>>
>>>     Such capabilities are not currently in FLASH2 and they will not 
>>> be in the first release of FLASH3, though they *may* be in future 
>>> releases. Others have managed to get this working for their own use.
>>>
>>>     Strictly speaking one would not be converting gas particles 
>>> (since we're working with Eulerian grid variables) but would be 
>>> creating massive star particles from scratch at a particular grid 
>>> location once conditions were met at that location (say, density 
>>> rises to a certain value and temperature falls below a certain 
>>> value). Then the star particle would be taking its velocity as well 
>>> from the local velocity on the grid.
>>>
>>>     In essence, this is not currently implemented but once one had a 
>>> prescription for this it should not be difficult to implement.
>>>
>>> Best,
>>>
>>> John Z
>>>
>>> On Jan 31, 2008, at 8:10 AM, M.A. Latife wrote:
>>>
>>>>
>>>> Hi all,
>>>> one of my colleagues is interested in using FLASH, His question is 
>>>> as follows, i Hope you people can reply his question in better way.
>>>> "I want to simulate star formation starting with gas particles. Is 
>>>> Flash able to convert gas particles (when a certain condition is 
>>>> met) into star particles? This because I want to see the initial 
>>>> mass function. Do I have to write my own module for this, or is 
>>>> there such an option already there? "
>>>>
>>>> Thanks,
>>>> M.A.Latife
>>