CFD-DEM case exits without any error message

MFiX
#1

Hi all,

I’m working on a simple case of invert trap with particles inside.
The case is uploaded here.
I don’t know why it simply exits without providing any error messages.

I’m quite new to MFIX. Please help.
Thanks!

Screenshot%20from%202019-04-26%2013-29-04
Screenshot%20from%202019-04-26%2013-29-041920×1080 180 KB
trap_2019-04-26T122109.zip (34.3 KB)

#2

When I run your case on my system, I see the error:

Operating system error: Cannot allocate memory
Allocation would exceed memory limit

Your mesh may be too fine, requiring too much memory for your system.

#3

Thanks for your reply.
Howevev, I tried to decrease the number of mesh, but got the same problem without any error message.
Could you also try to run with less mesh?
Thanks

#4

There are multiple things are not well defined.

  1. Do you want to generate particle with MFiX (gener_part_config = .True.) or do you want to provide the particle by particle_input.dat? You should use either one not both of them.
  2. Do you want to simulate a pure granular flow or a gas-solids system? If it is a pure granular flow, you can change it in the model setup.
  3. Your particle diameter is too small, it is 0.00015 as you defined. While your region is 5 times 0.48 times 0.15, when you generate particles, you will generate a very big number of particles, I simply increase the particle by 100 times, it can run.
#5

Thank you very much!
Your reply helps me solve this problem.
It’s just because there are too many particles.

#6

You can try PIC instead of DEM.