[FLASH-USERS] Viscous simulation of Laser-slab problem

[Acharya, Nitish]

Hi all,

I am running a simple laser slab (vacuum + CH target) problem with addition of viscosity in my problem. I have used the flux-based implementation of viscosity with the unsplit hydro solver. Constant kinematic viscosity is input via materialProperties/Viscosity module.

Below are the lineouts taken at location shown in the figure. It totally makes sense that my shock front has flattened out with use of some viscosity. All my density, vely and tele plots seem ok. But in my pressure plot, I see a strange artifact (an unsual spike at ~ the ablation front location) that I don't observe in my inviscid simulations. I even lowered my CFL (to ~0.05) to see if that would mitigate the issue (which to me look like some numerical issues) but it still persists.

Has anyone encountered a similar issue with viscosity implementation in laser driven simulation? I would really appreciate any suggestions or feedbacks.

Thanks,
Nitish


---------------------------

Nitish Acharya

PhD Student

Department of Mechanical Engineering

University of Rochester
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