[altano]

Hello Everyone,

I'm trying to simulate a cyclone to estimate efficiency and pressure drop values. I have got sufficient convergence for pressure drop (could'nt say the same for particle behaviour) but solver crashes in every run.

Details;

1- Mesh contains 4m tetra elements and inflation layers on walls. ( I tried diffirent mesh densities)

2- 10 different size particle described at setup, solid particle size variation 5 mic to 150 mic. Particle density is 3000 kg m^-3. One way coupled, fully coupled or both definition tried.

3-) Continuous phase is air @ 25 C

4-) SSG Reynolds Stress used as turbulence model, k-e, SST also tried

5-) Steady State analyses with different time scale and also automatic time scale had been tried.

5-) Transient analyses with different time steps had been tried

6-) Boundary conditions; mass flow outlet, pressure inlet, no slip wall


In steady state analyses I have got that message;

ERROR #001100279 has occured in subroutine ErrAction
Message:
Stopped in Routine Get_FCI_INFO


In Transient analyses, solver just said that;
CFX solver exited with return Code1.

Finally I got to say that; There is no abnormality seen in backup results and on solver monitors.


Any idea will be appreciated.

Thanks,
Altan

[ghorrocks]

The error message is saying a required variable is not defined. The message is a bit cryptic so I cannot guess what variable it is. But probably something to do with the multiphase setup.

[altano]

Thank you Glenn,

Undefined variable, it is interesting. I could get a solution file when I stopped after ~100 iterations or time steps.

[ghorrocks]

If it runs for a short time OK then maybe not an undefined variable. My advice is to remove the physics one at a time until the message disappears to find where the problem lies.

[bharath]

yes, altano you are right.i done cyclone separator in CFX and got different error messages and could n't find a solution.sorry to say this.so i tried it in fluent and got the results.

[altano]

thanks bharat and glenn

I'm little bit stranger for fluent interface and i am in rush.But yes, it seems best way is DPM method in fluent.

For now, i'm triying to get single phase transient results with RSM and use it for 1 iteration limited steady run (one way coupling particle). As I read the documents, one way coupling is close to dpm, it solves particle at the last iteration only. Regarding the my first cyclone geometry, results are reasonable.

[airforcegb]

I have no problem if I remove particle tracking

but it came back once I add particle tracking back....

[ghorrocks]

Then you have a problem with your particle tracking setup. That is pretty obvious.