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Transient calculation - BC Profils and MassFlowRate

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Old   November 24, 2011, 13:14
Default Transient calculation - BC Profils and MassFlowRate
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Join Date: May 2011
Location: Germany
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Hey together,

I really have I big problem with my calculation .....

I want to simulate a channel of a two-pass cooling system.
My investigations are only on the inlet-channel.
And I want to comapre the experimental results with my numerical results.
But the problem is the folowing:

I need:
- Velocity Profil (fully developed) at the Inlet (there is an extra channel in the experiment, but I don't want to simualte this one too -> lots of cells and CPU-time)

- MassFlowRate at the Inlet (time variant from experimental datas)

- Temperature at the Inlet (time variant from experimental datas)

- Temperature Profil at the Inlet (fully developed)

The Temperature part is not really the problem. I did a periodic calculation and got values for Temperature/massFlowAve(Temperature)@INLET. Exportet these datas as BC. Importet the datas to CFX-Pre. And my Boundary at the Inlet is now the value from BC * Temperature (t).

But how can I do the other two Boundary conditions?

I tried to create a new variable (name it AVM) from the periodic results (Velocity/massflow) and added as Inlet condition MassflowRate: massflow(t) and direction x=0 y=AVM z=0 (my flow direction is y). But the I get values greater 0 at the wall.

Hope you guys can help me.
Thanks in advance.
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