Floating point exception in EDEM-fluent coupling.
I tried to simulate flow impingement on particle bed. I use quiet big mesh as the particles is large. The flow simulation without particle runs properly.
But when I run EDEM-Fluent coupling simulation, the residuals increase in the beginning and floating point exception error occurs within 100 iterations.
The error message is
" Reversed flow on 770 faces of pressure-outlet 9.
Stabilizing mp-x-momentum to enhance linear solver robustness.
Stabilizing mp-x-momentum using GMRES to enhance linear solver robustness.
Divergence detected in AMG solver: pressure correction
……..
Divergence detected in AMG solver: pressure correction
Error at host: floating point exception
Error: floating point exception
Error Object: #f"
I tried these ways, but they seems have no effect.
- reduce the fluent timestep
- change pressure cycle type to flexible.
- increase the max iterations per time step.
I guess the error comes from volume fraction caculation, but I have no clue how to solve it. Below is the volume fraction and fluid velocity, pressure.
- volume fraction
2. velocity
3. pressure
2024.11.16
fang yanwei
Answers
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Hi Fang,
Fluent tends to be unstable when the particle is larger than the mesh, ultimately this is a limitation on mesh size however modifying (reducing) the fluent Under Relaxation Factors for Volume Fraction and Momentum transfer does also help.
Regards
Stephen
0
Altair Employee