hallo, I am working with the VOF-modell and I want to calculate the mean mass flow rate within a period of time at the outlet during batch calculation mode. Has anybody an idea how to do that? Thanks in advance

Enable the Data Sampling for Time Statistics on the Iterate panel.

Then define define a Custom Field Function in which you specify Q = rho*v_avg*S, where rho is the density of the flow, v_avg is the time averaged velocity (you can find it in the Unsteady Statistics list) perpendicular to outlet and S is the section of outlet (if constant, just insert the value, else omit it: you'll obtain the mass flux instead of the mass flow rate).

To obtain the mean value on the surface, just use the Report->Surface Integral function to obtain a area weighted average of the Custom Field Function you defined.

That's should be the value you're looking for.

Hi

ap

Thank u ap. I'll try it! Ataki