TAGGED: fluent
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May 20, 2024 at 6:37 pm
vipul.gupta
SubscriberI am working on VOF multiphase simulation. Everything was ok up to 138 seconds, but suddenly after 138.18 seconds, the correct number increased to a high value of more than 250. Velocity unexpectedly becomes very high. Maximum velocity reaches 220124 m/s. The simulation stops with a floating point exception error.Â
How to resolve this issueÂ
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May 21, 2024 at 10:55 am
Rob
Forum ModeratorI assume you mean Courant Number.Â
What happens in the flow at around that time? Ie does something change? If you restart from an autosave case & data does the error repeat?
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May 21, 2024 at 4:32 pm
vipul.gupta
SubscriberI mean Golbal courant number. I used the adaptive time step method for time step size. Velocity becomes very high around this time. I restarted from an autosave case and data. The issue remains the same.Â
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May 21, 2024 at 4:43 pm
Rob
Forum ModeratorTurn off adaptive time stepping and see what's going on. The function can be very useful for flows with gradual changes in time scale, if something suddenly changes the scheme may not drop the time step rapidly enough.Â
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May 21, 2024 at 5:14 pm
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May 21, 2024 at 5:17 pm
vipul.gupta
SubscriberRight side middle plane velocity vectors plot goes to near 155 m/s which is unrealistic.Â
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May 22, 2024 at 12:27 pm
Rob
Forum ModeratorThat's the traditional "big red vector". Check the mesh in that region and that you're resolving the gas phase as it looks like a very narrow gap between the wall & free surface.Â
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