[FLASH-USERS] Changing Gamma (eos)

[Seyit Hocuk]

Hi Anshu,

Like I said, I made that change in eos1d.F90 already. However, that file 
is only used when initialising FLASH. It is not used at every timestep. 
This is the whole issue. If I change the formula there, it will only 
calculate once in the beginning, then it will use that value throughout 
the whole simulation.

Seyit



> Hi Seyit,
>
> In FLASH 2.5 you need to make that change in eos1d.F90 also.
>
> Anshu
>
> Anshu
>
>   
>> Hi Anshu,
>>
>> I am using FLASH2.5 and it might be a little different to version 3.0.
>> Though I have tried to change things in eos.F90, but the unfortunate
>> thing is that (pretty sure) eos.F90 is not called at every timestep
>> 'dt'. It is (might be) only used when initializing the blocks. This is
>> of no use to me. I want to update gamma like you say at every timestep
>> (gamma will be dependant on temperature and density basically).
>>
>> In Flash2.5, the eos.F90 is in "source/materials/eos/gamma/".
>>
>> Btw. I am using a module eos1d inside my "init_block.F90" file. Of
>> course, changing the formula of gamma there isn't helping.
>>
>> Thanks,
>> Seyit
>>
>>
>>     
>>> Hi Seyit,
>>>
>>> This feature is not a part of FLASH default behavior. If you are using
>>> FLASH3 then you have two options. The value of gamma in Eos is carried
>>> in a variable called eos_gamma, which is defined in the data module for
>>> the Eos unit, in file "source/physics/Eos/EosMain/Eos_data.F90".
>>> Normally
>>> this variable is initialized in Eos_init, and then used in "Eos.F90".
>>> Your first and simplest option is to add a line
>>> at the beginning of "Eos.F90" to update the eos_gamma value at each time
>>> step. You can fetch the value of dt by calling the function
>>> "Driver_getDt".  If you need time dependent gamma for only one
>>> setup, then the better option is to place a copy of Eos.F90 in the
>>> simulation directory and modify that file as described above. That way
>>> you won't have to worry about the source tree when you get later
>>> versions of FLASH.
>>>
>>> Anshu
>>>
>>>
>>>       
>>>> Hi all,
>>>>
>>>> I have a simple question. I want to put a changing gamma in my
>>>> simulation. e.g. a gamma which changes and depends on dt. Where to
>>>> change this formula of gamma?
>>>>
>>>> I can't locate it in the database.
>>>>
>>>> Thanks,
>>>> Seyit
>>>>
>>>>
>>>>