Problem about the steady state simulation of fluidized bed

MFiX How to
#1

Hi everyone!

Recently, I am trying to simulate the steady state of a fluidized bed by TFM. The case just involves the energy equation, there is no species or reactions. However, The MFiX 24.2.3 reported the following error:

Error: Solver crash!

The MFiX solver has terminated unexpectedly

Error information:

float divide by zero in __dgtsv_mod_MOD_dgtsv

at DGTSV.f:190

I do not know what is wrong with it. I noticed that there are some similar topics in the forum but there is no reply, so I want to ask this question again.

The mfx file is attached, thank you very much!
Ammonia_3D.mfx (19.8 KB)

#2

It seems that the setting of steady state is not appropraite. I advise that changing the case to a transient simulation. If you want the results at the steady state, you can just simulate the cases for a period of time until the main parameters remain almost constant.

#3

Thank you for your reply! I will try to do some transient simulation.

By the way, I still want to know the reason about this problem, could you give me some advise about it?

#4

Sure!
In the physical landscape, the physical quantities in each cell are not kept constant with time. They are always oscillate slightly around a certain value. Therefore, it’s may be more apporiate to capture the features about the system by non-steady simulations.

#5

OK! I got it, Thank you very much!