|June 14, 2012, 11:31||
Need help: 7 times more Mass Flow out than in
Join Date: Jun 2012
Posts: 4Rep Power: 6
I want to simulate the Battery-Cooling of a formula student car.
I implemented a radial fan, like in the rigid body motion tutorial
Inlet: Velocity (15m/s)
Prism Layer Mesher (2)
If I try Coupled Energy, the outgoing Mass Flow is going to be 7 times bigger than the incoming Mass flow.
It is still increasing.
Please help me!
Have a nice day!
( Please excuse my bad English)
|June 15, 2012, 15:42||
Join Date: Oct 2009
Posts: 637Rep Power: 13
A mass flow report at each inlet and outlet should be fine to judge the mass imbalance.
How long did you run it? What about your time step size? Is it small enough? What about the convective courant number? Residuals? How does the flow field look like, is it reasonable?
In my experience, the coupled solver needs a long time until a reasonable flow field has established. So although CD-adapco recommends the coupled solver when ressources are no issue, I would stick to the segregated solver when there are no high mach numbers involved. Or at least try to initialise as good as possible.
When the setup is right and you run it long enough, the coupled solver will give you the same mass flow in and out for sure (assumed, you're looking on average values over a long enough period).
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|fan, invreasing mass, mass flow rate, rotating|
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