TFM model, does not converge

MFiX
#1

Hi everyone,
I conducted the decomposition simulation of organic matter in MFIX21.3.2, using the TFM fluidized bed model, and the reactor was two-dimensional. When the calculation proceeded to 0.26~0.27 seconds, the time step decreased rapidly, and “DT < DT_min…” appeared. Then the calculation stops.

QQ截图20211212155422
QQ截图20211212155422660×668 40.9 KB

Later, I changed the minimum time step to 1.0e-15s and increased max_inlet_vel_fac to 1.0e5. In this case, the calculation could continue, but at 0.27s, a mutation occurred.
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I tried a lot, but I couldn’t solve the problem. Can you give me some advice?
In the compressed package are related files and calculation results.
12.10_rea.zip (46.5 MB)

#3

Turn off the reactions to see if this a hydrodynamic issue or a reaction issue. If it runs fine without reactions, review the reactions rates, they may be too large.

#4

Hello, I have recently encountered a similar problem to yours. Have you solved it yet? I look forward to your reply. Thank you!

#5

Hello, please attach the project file. mfx. I can help you have a look.

#6

Thank you very much for your quick reply. I look forward to your review. Thank you!
Qian_binhui_first_1.mfx (27.2 KB)