How to input different particle-wall mechanical properties on different walls in MFix-DEM

MFiX
1

Hello,

I want to input different particle-wall mechanical properties on different walls in MFix-DEM for the same channel. Since the front and rear wall are of different material, I should be using different particle-wall values.

If the walls are considered same in DEM.

How can I separate the walls to input different particle-wall mechanical properties separately?

Do I need to modify fortran code?

Please clarify me on the same.

Thanks.

2

Hello,

Can someone please clarify me on how to input particle wall properties on different walls separately?

Thanks.

3

This is not natively supported, it is assumed all walls behave the same. If you want to modify the code, you can start by studying model/des/calc_collision_wall_mod.f and model/check_data/check_solids_dem.f.

4

Thank you for your response.

I need to modify only these two .f files and build the solver to compile right?

What about .mfx file. Do I need to modify that too?

5

You may need to modify more files depending on how you want to implement it. If you just want a quick ad hoc implementation, where you overwrite existing variables, this may be sufficient. If you want a robust implementation, then you need to introduce new variables and new keywords. This will require some time investment so you get familiar with the code. The two files I mentioned is a starting point, then you need to decide how you want to implement and browse through the code.