How to know if the run time is reasonable?

[jack7z]

Hi Charles,

I think I solved the run time problem by running the DMP solver in 16 processors. It takes only 3 days to run the simulation now. However, could you help me take a look at my reaction rate coefficient problem? Thanks a lot!

Jack

Reaction rate coefficient caused problem

Hey guys, I’m trying to simulate a TFM that has really fast reaction, which absorbs most of the CO2 in the air as soon as air flows into the fluidized bed. usr_rates.f (2.4 KB) td_jelly_roll.mfx (25.9 KB) When I increased the reaction rate coefficient to 100 (line 69 of usr_rates.f ), it gave me an error: ERROR time_step.f:193 DT < DT_MIN. Recovery not possible! However, it did not happen when I had lower reaction rate coefficient (at 1 or 10). Does anyone know what is causing the error? M…