[FLASH-USERS] Meaning of the extremely large temporal parameters in example.par of LaserSlab

[Chul Min Kim]

> Dear Klaus,
>
> Thank you for the propmt answer, with which and the section 7.1.5 of 
> User's Guide (4.6) 
> (http://flash.uchicago.edu/site/flashcode/user_support/flash4_ug_4p6/node51.html#SECTION04115000000000000000), 
> I could understand the implication of the extremely large values.
>
> Regards,
>
> Chul Min
>
> 2019-06-01 오전 3:30에 Klaus Weide 이(가) 쓴 글:
>> On Sat, 1 Jun 2019, Chul Min Kim wrote:
>>
>>> I am going through the example.par of LaserSlab and curious about 
>>> the meaning
>>> of the extremely large temporal parameters:
>>>
>>> df_diff_factor = 1.0e+100
>>>
>>> hx_dtFactor = 1.0e+100
>> Regarding runtime parameters, you can find documentation for many of 
>> them
>> in the file setup_params (which is built by ./setup), for example,
>>
>>       dt_diff_factor [REAL] [0.8]
>>          Valid Values: Unconstrained
>>          factor that scales the timestep returned by Diffuse_computeDt
>>
>>> Do these extremely large values imply that the program tries to have 
>>> \nabla^2
>>> Q = 0 (Q is a physical quantity.) and tele=tion? Or, does it mean that
>>> diffusion and heat exchange is effectively removed in the simulation?
>> Those values just mean that dependence of the time step on both 
>> diffusion
>> and heat exchange is effectively removed. They do not affect the 
>> operation
>> of diffusion and of heat exchange otherwise.
>>
>> Klaus