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Fluctuating Inlet for DNS

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Old   March 7, 2019, 10:20
Default Fluctuating Inlet for DNS
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I am simulating a nozzle with a throat Re of 3500. I have the resources to directly resolve the jet breakdown after the nozzle but I need fluctuating inflow BCs to get physically realistic results.

I know there are fluctuating inflow BCs for LES but can't figure out how to use fluctuating inflow BCs when directly solving navier-stokes.

If anyone has suggestions I'd appreciate it.

Thanks in advance.
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Old   March 7, 2019, 15:16
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In DNS you have to directly specify the inflow, your fluctuating inlet BC is just a velocity inlet where you completely specify the velocity everywhere, all the time.
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Old   March 7, 2019, 18:24
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Yes, I understand I need to specify inflow everywhere for all time. Using the built-in turbulence generation features from LES would be nice as otherwise I need to write my own udf.
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