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Time step about forced harmonic simulation

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Old   September 19, 2022, 10:01
Default Time step about forced harmonic simulation
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chunlong Tan
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Dear all,

when I chosen Harmonic->Fluid Structure->Mechanical Coupling->Modal->Forced motion to conduct an flutter analysis. I found that there was no imformation about iteration time step. I'm wondering if this type of simulation is not related to the time step, or if I didn't find where to set the time step.

Kind regards,
Chunlong
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Old   September 30, 2022, 11:43
Default Time step about forced harmonic simulation
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Wout Poncelet
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Dear Chunlong,

Given that you're performing a flutter analysis and you mention the harmonic, I assume you're running a NLH simulation? Is my understanding correct?

In that case, there is no need to specify a time step (just a CFL number). The NLH method will solve the NS-equations in the frequency domain. Once your simulation is converged, you will be able to reconstruct your solution in space and time, here you can specify the time step and the number of time steps you want to reconstruct.

The imposed forced motion, in case of a NLH simulation, can be constant in time or defined with a given frequency/mean value/IBPA/Real and imaginary part.

I hope this may help you.

With best regards,
Wout Poncelet
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Old   October 13, 2022, 03:22
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chunlong Tan
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Dear Wout,

Thank you, your answer has completely solved my confusion.

Kind regards,
Chunlong
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