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automatic time step control

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Old   June 27, 2021, 04:24
Default automatic time step control
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Hi folks,
I want an atomatically adaptive time step in order to keep the convective clf stable. However I don't want to use an udf right now, since I don't have to time to learn anpther pseudo-language. So I just want to use expressions.

This should be actually very simple, I just want to use the maximum clf-number in the field to correct the current time step. For that I see two options, each with an own problem:

1. I use the existing parameter "delta-time" and combine it mathematically with the expression of the "Maximum(ElementConvectionCourantNumber,['int_fluid'], Weight=None)". Problem here is that in the window fot the calculation of expressions I don't see a way to implement parameters.

2. I just use an pseudo-variable to adapt each time step according to the current max-clf. However again, I don't know hot to create/use a variable, which is not connected to any quantity in the system and which can be just increased/decreased at each timestep.

Please solve one of the two problems, or provide me with a third option.
Thank you very much
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automatic, expression, time step, udf

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