[simonsg]

Hi guys,

Is anyone know how to calculate mean turbulent flux (mean u'c') in openfoam? I know people can set function object in controlDict for fieldAverage to compute turbulence fluctuation such as mean u' or mean c'. But how to compute mean u'c'? Do we need to create customized functions for that? Anyone with similar experience can give suggestions?

Thanks & regards,
Simon

[ykanani]

Originally Posted by simonsg

Hi guys,

Is anyone know how to calculate mean turbulent flux (mean u'c') in openfoam? I know people can set function object in controlDict for fieldAverage to compute turbulence fluctuation such as mean u' or mean c'. But how to compute mean u'c'? Do we need to create customized functions for that? Anyone with similar experience can give suggestions?

Thanks & regards,
Simon

1- define new variable like uc (with multiplying instantaneous values of u to c)
2- use fieldaverage utility to calculate <uc>, <u>, <c> (time average )

3- Then <u'c'> = <uc> - <u><c> (you can either calculate it in paraview or by adding the calculation to the solver, first one is easier)