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MassFlow Function? Absolute MassFlow? Failure in Caclulation |
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May 5, 2011, 10:46 |
MassFlow Function? Absolute MassFlow? Failure in Caclulation
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Join Date: Dec 2010
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Hi guys
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 Interface_Top Interface_Bottom Interface_Side 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 AbsInt Interface Top 0,0073 IAbsInt nterface Bottom: 0.0057 AbsInt nterface Side: 0,0155 MassFlow 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! :-) Thanks |
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