[acakaacaka]

Hi,

I want to simulate a centrifugal compressor for a turbocharger. In my simulation domain I have a CAVITY which I model as a mass flow outlet that depends on the mass flow of the INLET with the formula

MassFlowCavity = massFlow()@INLET*0.0004

in some cases this will lead to an oscillating mass flow at the INLET (and OUTLET) of the main flow. So I have the idea to only update the CAVITY mass flow outlet every 50 Iteration.

MassFlowCavity = if(mod(citern, 50) == 0, massFlow()@INLET*0.0004, *DONT CHANGE*)

I dont quite know what to put for *DONT CHANGE*.

[ghorrocks]

There is no simple way of doing this in CFX.

If you have specified the mass flow rate through the device, then just specify the mass flow rate in the cavity directly (not as a function of another boundary).