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

[Klaus Weide]

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