"use_exp_form = true" flag often causes simulations to fail

[arfc]

"use_exp_form = true" flag often causes simulations to fail

[gridley]

I think deprecating use_exp_form would be worth considering. It adds a pretty large expense to have to compute logarithms/exponentials at each quadrature point. In fact, I believe it would speed moltres up fairly to simply eliminate the computeQpConcentration. I can't think of any problem where this approach is actually necessary. Maybe there is some problem where this is required in plasma problems, but there are no neutronics problems documenting this in the literature which require this approach. Its accuracy is also debatable considering that discretization error is much larger than roundoff error in any case Moltres runs.

[smpark7]

Hi @gridley . Yea I also can't think of cases when computeQpConcentration would be useful. MOOSE provides better alternatives for scaling. I'll probably make a PR for this when I have the time.