[Fabi_THU]

Hello,

i am a student and i'm doing a simulation for a Formula Student Team regarding the electric motor heat transfer.

We have two Regions:
Region Housing (Solid Aluminum)
Region Water (Fluid)

We've done different Geometries (different cooling concepts) with the same solvers /physics and it worked just fine so i think it is a mesh problem but i have no idea how to solve it.
I already tried to delete Invalid Cells, but there are none. And i also tried to change the URF Settings.


This is the error that occurs at around 30 iterations:

WARNING: insufficient precision on multigrid level 8, nRows = 38
AMG coarsening halted.
This may indicate double precision version is needed.
A floating point error has occurred. The following error has been logged:
A non-finite residual (X-momentum) was added by star.segregatedflow.SegregatedFlowSolver. Typical causes are overflow, underflow, or a division by zero.Please check your usage and inputs.
Command: StepSimulation
error: Server Error

Those are the solvers we are using:
Steady
Segregated Flow
Segregated Energy
K-Omega Turbulence

I will add photos of the mesh so you can "judge" it.
Thanks a lot for any type of help. If you need any more informations let me know.

https://imgur.com/a/4M1iIBt <- Pictures

I already did a finer mesh (pictures is the older mesh) but it changed nothing..same error.

[b2cud]

Hi, im having the same issue and cannot work this out. Did you figure this out or not.
many thanks

[Aeronautics El. K.]

Start by changing the verbosity of the solvers to see which one is diverging first.

[calim_cfd]

Hi..it looks like a mesh error... review your case regarding your domain before meshing..and mainly check your interfaces..check if there's any geometry issues... then try to run an isothermal case ..finally switch on the energy equations.
Good luck,

[cramr5]

Any update on that? I am running into the same problem when I am trying to model a thermal bath