Regularization

[spatel81]

Im solving a LES problem that includes a temperature field. In my par file, I set the following

regularization = hpfrt + nModes=1 + scalingCoeff=10 ...under the [GENERAL] section. Does this apply the high pass filter to all fields, including temperature?

If I were to add regularization = avm to the [TEMPERATURE] section, does that mean an additional viscous term (based on the paper by Lu 2019?) is treated, on top of the hpfrt?

[stgeke]

The regularization setting in [GENERAL] holds for all fields, but you can overwrite it in a field section. In your example you would use hpfRT to velocity and avm for temperature.

[spatel81]

I see. so it would not be both for my case - just avm for temp?

[stgeke]

Yes, just avm (not both) for temp.

[spatel81]

what is the difference between applying avm using the par file vs. applying avm via the .udf with uservp (e.g. here)?

[stgeke]

If applied manually (not in par), you gain greater flexibility. For example, you could multiply it with an additional coefficient or base it on another quantity.