Floating point exception in EDEM-fluent coupling.

fyw

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.

1. reduce the fluent timestep
2. change pressure cycle type to flexible.
3. 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.

1. volume fraction

2. velocity

3. pressure

2024.11.16

fang yanwei

Stephen Cole

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.

Error: Fluent - EDEM oupled simulation

Kiran Purushothama Keshavan

Mar 19, 2024

Hi,

I executed a coupled simulation for a simple EDEM-Fluent case, the simulation ran for 1011 iterations and it terminated because of divergence.

Please give me your comments on what might have gone wrong. I had previosly executed the EDEM and fluent case seperately and there were no errors.

I have included a few plots and the console data as attachments below.

Please advice.

Regards,
Kiran

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Regards

Stephen