Mean calculation in LES
I am simulating the lock-exchange density current flow. Here, a heavy lock fluid is released under an ambient light fluid. The dynamic Smagorinsky method is used for the simulation.
The simulation is completely unsteady (not even periodic or like that) and I need to calculate a mean and fluctuation component, to calculate the profiles of epsilon, k, production, ... in different sections. I have searched the web but found nothing about how to calculate the mean. I read somewhere about averaging on a time window about every point in time. Is this possible? If yes, how much should be the window size?
I'd really appreciate it if you could help me with this (it wouldn't be a problem if the physics of your simulations are different). I really am looking towards the basics.
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