[FLASH-USERS] Solid State in simulation

[Hansen, Eddie]

Hi Lizy,

It is true that we do not have true solid mechanics in FLASH. What you found is the BDRY_VAR. When this is 1., the code treats these cells as “solid”, and when it is -1., they are fluid as usual. The fluid cells see the solid cells an an embedded reflecting boundary. However, diffusive processes that are not solved within the Hydro unit (such as implicit thermal conduction) ignore BDRY_VAR.

You could try writing your own code in Simulation_adjustEvolution that changes the value of BDRY_VAR based on some condition(s) (e.g., a melting temperature).

--
Eddie Hansen
Applications Group Leader
Flash Center for Computational Science


From: flash-users <flash-users-bounces at flash.rochester.edu> on behalf of lizy <3287940670 at qq.com>
Date: Wednesday, June 19, 2024 at 2:26 AM
To: flash-users <flash-users at flash.rochester.edu>
Subject: [FLASH-USERS] Solid State in simulation
Dear flash developers, hello!
     I am pleased that flash is one of the best solutions to the problem of magnetohydrodynamics.
    I have a problem with simulations being heated that start at room temperature (such as laserslab, or zpinch), where the metal is solid at room temperature at the beginning and the velocity is small. Can the characteristics of solid mechanics be reflected in the simulation? Because I noticed that in the hydro solver, there is a parameter called right body that can change with temperature? For example,  at 300K, aluminum is solid and the parameter is 1; At 1000K, the aluminum becomes a fluid and the parameter changes to -1.
And in the different parameter, the fluid flow state is different?
     Thank you for your careful answer!
                                                                Lizy
                                                      19,6,2024
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