timeVaryingMappedFixedValue + turbulentinlet

kaaja · April 20, 2017, 06:59

Hi,

I have been simulating a channel flow using different RANS-models with an externally given inlet BC for the mean velocity by using timeVaryingMappedFixedValue. This works fine.

Now I want to run a LES simulation on the same domain. I want to keep the inlet BC for the mean velocities, given by the external data, but I must get in some fluctuations in this inlet. Basically what I want is a combination of "timeVaryingMappedFixedValue" and "turbulentInlet", where I just add some fluctuations to the mean profile supplied by "timeVaryingMappedFixedValue". Does anybody know how this can be achieved?

Ardali · May 10, 2017, 05:13

Hi,
For doing LES, that is much better to run the channel flow with a constant source term, pressure gradient, and then sample the results to your domain using timeVaryingMappedFixedValue.
Ardalan

April 20, 2017, 06:59	timeVaryingMappedFixedValue + turbulentinlet	#1
kaaja Member Join Date: Apr 2017 Posts: 68 Rep Power: 9	Hi, I have been simulating a channel flow using different RANS-models with an externally given inlet BC for the mean velocity by using timeVaryingMappedFixedValue. This works fine. Now I want to run a LES simulation on the same domain. I want to keep the inlet BC for the mean velocities, given by the external data, but I must get in some fluctuations in this inlet. Basically what I want is a combination of "timeVaryingMappedFixedValue" and "turbulentInlet", where I just add some fluctuations to the mean profile supplied by "timeVaryingMappedFixedValue". Does anybody know how this can be achieved?

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May 10, 2017, 05:13		#2
Ardali Member Ardalan Join Date: Jul 2012 Location: Atlanta, USA Posts: 77 Rep Power: 14	Hi, For doing LES, that is much better to run the channel flow with a constant source term, pressure gradient, and then sample the results to your domain using timeVaryingMappedFixedValue. Ardalan