[FLASH-USERS] Flash LaserSlab ionmix

[Siyi Yu]

Oh I see, thank you for your suggestions! I will try firstly establish my
own IONMIX files.
Thank you again!
Best
Siyi YU

On Wed, Jun 21, 2017 at 12:52 PM, Carlo Graziani <carlo at oddjob.uchicago.edu>
wrote:

> Klaus is, of course, correct.  However, note that the ionization of
> Hydrogen
> is a straightforward analytic solution of the Saha equations, requiring no
> laborious computation.  If you Google "Saha equation Hydrogen" you'll get
> 260,000+ hits, many of the top of which are informative.  Many thermal
> physics
> and stellar astrophysics texts also supply the solution.
>
> Which is all by way of saying, if you don't want to mess around with the
> internals of FLASH's EOS (and I wouldn't blame you if you didn't), it
> should not be too much trouble to make your own IONMIX-style table for
> Hydrogen, using the analytic solution.
>
> Carlo
>
>
> On 06/21/2017 02:29 PM, Klaus Weide wrote:
>
>> On Wed, 21 Jun 2017, Siyi Yu wrote:
>>
>> Hey Klaus,
>>> I am also trying to implement hytrogen ionization in my simulation. I am
>>> wondering, instead of using IOMIX documents, is it possible to implement
>>> a
>>> self-written function that calculates electron densities from temperature
>>> please?
>>>
>>
>> Hi Siyi,
>>
>> In principle this is possible. Even in the best case, it will probably
>> require some significant (re)writing of code. How much, and how difficult,
>> will depend a lot on what you want to do. Some initial questions to narrow
>> down your requirements:
>>
>>   * Do you want to use this in 1T or in 3T (or RadFLAH?) simulations?
>>
>>   * Do you Nele / ZBAR depend on only (density,temperature,composition),
>>     or on additional independent variables? (maybe including time /
>>     history?)
>>
>>   * Do you just want one Eos implementation for all of your material(s),
>>     or do you want an implementation that models just the behavior of the
>> hydrogen
>>     fraction in a multi-material, multi-type situation and can be combined
>>     with other implementations for other materials?
>>
>>   * Do you want an Eos that is thermally ideal or something more
>>     complicated?
>>
>>   * Do you need the derived quantities that Eos can potentially
>>     provide - see Eos.h - and if yes, which ones, or would you be
>> satisfied
>>     (at least initially) with just getting the main variables
>>     like EOS_PRES, EOS_EINT, EOS_TEMP returned correctly by Eos?
>>
>> Klaus
>>
>>
>
> --
> Carlo Graziani                                 (773) 702-7973 (Voice)
> University of Chicago Astronomy                (773) 702-6645 (FAX)
> 5640 South Ellis Avenue     -------------------------------------
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> carlo at oddjob.uchicago.edu  |               --- Kin Hubbard
>
>
>
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