|May 5, 2011, 09:46||
MassFlow Function? Absolute MassFlow? Failure in Caclulation
Join Date: Dec 2010
Posts: 135Rep Power: 8
I posted a similar question a few months ago and I am trying it now again. I have a geometry with 2 Inlets where fluid can go in and out and also one Outlet on the side, where fluid can go in and out. (For a pic see in the attachement)
This is my problem
I want to calculate Percentage of the Massflow which is going inside the domain and coming out.
These are my 3 domoins
I created an AbsInt for every Interface Expression:
AbsIntTop = areaInt(Density * abs(Velocity in Stn Frame w))@Interface_Top
I also used the CFX Massflow function for every surface.
MassFlowTop = massFlow()@Interface Top
If the MassFlow result is positive on Top Side (x-y Plane) it means that the Result is that part which is going inside the domain, which means that I can just say:
AbsInt - MassFlow = Fluidpart which is coming out again and not keeping inside
For the Interface_Side I used of course the radial velocity and not the Velocity w!
So these are my results:
AbsInt Interface Top 0,0073
IAbsInt nterface Bottom: 0.0057
AbsInt nterface Side: 0,0155
MassFlow Interface Top: 0,00626
MassFlow Interface Bottom:0,00562
MassFlowInterface Side: 0,0139
Let's do AbsInt - MassFlow for every Inteface.
Delta Interface Top 0,00104
Delta Interface Bottom 0,0001
Delta Interface Side 0,0016
These must be the part of the fluid which is a Loss. So If I sum up e.g.:
AbsInt Interface Top - Delta Interface Top + IAbsInt nterface Bottom - Delta Interface Bottom it should be MassFlowInterface Side
0,0073-0,00104+0,0057-0,0001 = 0,01186 which is NOT MassFlow InterfaceSide = 0,0139
Sorry for the complicated way to explain my question?
Need help! :-)
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