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#1 |
New Member
Wenyu Zhao
Join Date: Apr 2021
Posts: 18
Rep Power: 5 ![]() |
Hello, I set a working condition with a fixed time step, but the following contents are always displayed during operation{‘EMERGENCY STOP -- velocities exceeding critical value N 61’}. Then set the value of n61 large enough,, but the above situation still occurs. How should I adjust it?
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#2 |
Senior Member
Arun Kamath
Join Date: Nov 2014
Location: Trondheim, Norway
Posts: 265
Rep Power: 13 ![]() |
When you encounter an error due to "velocities exceeding N 61", it means that something is wrong with your simulation, resulting in unphysical high velocity values.
You need to inspect what is happening to your simulation, say, in Paraview. Since you use a constant time step, I believe this is the source of your problem. See if the problems goes away when you use the CFL criterion instead. And then, if you really wish to use a constant time step, use the time step that is of the order of that seen in the simulation with the CFL-based time step.
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#3 | |
New Member
Wenyu Zhao
Join Date: Apr 2021
Posts: 18
Rep Power: 5 ![]() |
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