[FLASH-USERS] Adding viscous term in the momentum equation

[Rodrigo Fernandez]

Dear Nitish,

I've used viscosity in FLASH via the
Diffuse/DiffuseFluxBased/Diffuse_visc.F90 routine, which modifies the
fluxes out of the Riemann solver and before the conservative update (with
the split PPM hydro solver, but it should hopefully work with other solvers
too). The viscosity is input via the materialProperties/Viscosity module.
It has worked quite well for me after some customization to the problem at
hand (e.g., viscous fluxes at boundaries, which you need to set by hand,
etc.).

Best,

Rodrigo


On Thu, Jun 11, 2020 at 7:01 PM Acharya, Nitish <nachary2 at ur.rochester.edu>
wrote:

> Hi everyone,
>
> I figured FLASH solves only the non-viscous Euler equations for simulating
> HED experiments. I plan to solve a complete Navier Stokes Equation for a
> Laserslab problem by explicitly defining a constant viscosity coefficient
> for materials. From what I understand, I might have to add a viscous term
> in the momentum equation and modify the hydro unit in FLASH. How convenient
> is it to implement this? What should be the general approach to add this
> extra term in the hydro solver? I would really appreciate any sort of help
> here?
>
> Thanks,
> Nitish
>
> ---------------------------
>
> Nitish Acharya
>
> PhD Student
>
> Department of Mechanical Engineering
>
> University of Rochester
>
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