[anthi]

I am trying to simulate a quasi 2D and two phase (water -air) settling tank. I use the homogeneous model to model the air - water domains and the ASM model to simulate the solids.

Firstly, I run the two - phase tank without solids and the solution converged. However, when I tried to run the model with solids, the run is terminated with error after approximately 1000 iterations. I attach the error:

Parallel run: Received message from slave
-----------------------------------------
Slave partition : 3
Slave routine : ErrAction
Master location : RCVBUF,MSGTAG=1214
Message label : 001100279
Message follows below - :

+--------------------------------------------------------------------+
| ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| Floating point exception: Overflow |

+--------------------------------------------------------------------+

Parallel run: Received message from slave
-----------------------------------------
Slave partition : 3
Slave routine : ErrAction
Master location : RCVBUF,MSGTAG=1214
Message label : 001100279
Message follows below - :

+--------------------------------------------------------------------+
| ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| Stopped in routine FPX: C_FPX_HANDLER |

+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| An error has occurred in cfx5solve: |
| |
| The ANSYS CFX solver exited with return code 1. No results file |
| has been created. |
+--------------------------------------------------------------------+

End of solution stage.

+--------------------------------------------------------------------+
| The following transient and backup files written by the ANSYS CFX |
| solver have been saved in the directory |
| C:/Windphd/Small/small_pending_tasks/dp0_CFX_Solution/Fluid Flow |
| CFX_001: |
| |
| 0_full.trn |
+--------------------------------------------------------------------+


+--------------------------------------------------------------------+
| The following user files have been saved in the directory |
| C:/Windphd/Small/small_pending_tasks/dp0_CFX_Solution/Fluid Flow |
| CFX_001: |
| |
| mon |
+--------------------------------------------------------------------+


+--------------------------------------------------------------------+
| Warning! |
| |
| After waiting for 60 seconds, 1 solver manager process(es) appear |
| not to have noticed that this run has ended. You may get errors |
| removing some files if they are still open in the solver manager. |
+--------------------------------------------------------------------+

This run of the ANSYS CFX Solver has finished.

I have read the FAQ and the relative before answeared threads in the forum, so I tried the following:

1.) Double precision.
2.) Minimizing the timestep.
3.) Changing the mesh.

Nothing worked.

Any other idea that could possibly help me?

Since the run converged without solids, I believe that something is happening with ASM model. Has anybody used ASM model combined with homogeneous model?

Thanx a lot in advance

Anthi

[ghorrocks]

I have never tried that combination of models.

I would output a backup file before it crashes. Then have a close look in the post-processor and see if you can find something which is going haywire. That will give you some clues for where to look.

Just a thought - ASM with a homogeneous free surface model could end up with some strange results - like solids flying out of the liquid phase and into the solid phase. You might need something more sophisticated than ASM. But I could be wrong. Just a thought.

[anthi]

Thanx for your advice.

Do you have any idea about the model that I could try for simulating the solids?

[ghorrocks]

I was thinking of just a normal eularian-eularian multiphase model.