Computational divergence due to mesh

MFiX
#1

Dear developer,
I want to simulate a reactor base on CGP model, but the calculation always diverges. I am not sure why. This question has been bothering me for a week.
Could you help me check it? Thank you very much!
mfix-22.3.4.
dangban_chuchuncao_2023-05-24T114817.245701.zip (262.2 KB)

#2

mfix-22.4.3，not 22.3.4

#3

I cannot start your simulation. You have set the Cp to be computed based on species mixture, but you did not define species. Please fix or attach the setup that diverges

#4

Sorry, are you referring to the specific heat capacity of fluids and solids? The new calculation file has been uploaded, thanks!
dangban_chuchuncao_new.zip (7.6 MB)

image
image680×634 14.8 KB

image
image696×475 11.1 KB

#5

Thanks, yes this is what I was referring to. You may need to adjust some of the meshing parameters. I increased the “normal distance tolerance” to 0.01 and it seems to run better.

#6

Yes, it can run, amazing！So cool! And is there any meshing strategy can be referred to, thanks！

#7

emmm, it diverges at 0.92s :cry:

image
image863×515 45 KB

#8

2D-9_extend.stl (9.1 KB)
dangban_chuchuncao.mfx (21.2 KB)

Please try the attached. I extended the stl geometry in the z-direction to get better intersection and set wall BCs along zmin and zmax planes. This one ran to completion for me.

#9

OK, thank you very much!!!