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Fluent crashing suddently "Received signal SIGSEGV"

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Old   December 18, 2023, 07:03
Unhappy Fluent crashing suddently "Received signal SIGSEGV"
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Pavel Novosad
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For the last few days I have been stuggling to resolve a problem where my Fluent solution crashes after time step ends.

I am simulating an two phase flow round a spray nozzle. For this I am using implicit VOF and DES models together with automatic mesh refinement. As a boundary condition for the nozzle outlet I use profile data from previous simulation.

The simulation ran fine for 2411 timesteps. However i get

Process 12552: Received signal SIGSEGV.
Process 5360: Received signal SIGSEGV.
Process 10216: Received signal SIGSEGV.

errors when starting timestep 2412. I have not changed anything in this time step and it does not seem to be caused by divergence as residuals seem normal.

From what i have found so far, the SIGSEGV error seems to be connected to memory alocation and UDFs. I however do not use any. And this should not be caused by lack of memory as I have tried running the file on both local windows and linux cluster.

Do you have any recomendations as to what could cause such problems?
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Old   December 18, 2023, 07:27
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AlexanderZ will become famous soon enoughAlexanderZ will become famous soon enough
as you have an error at specific timestep 2411 you may try to change timestep value around that moment ( may be few step in advance)

Received signal SIGSEGV. means fluent is asking for data which is not allocated
it could be because of VOF model or mesh refining or combination or others

you may try to turn off mesh refinement
best regards

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cluster setup, multiphase flow, sigsegv

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