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Flow simulation breaks heat laws?

Question asked by Euan Long on Jul 18, 2013
Latest reply on Jul 18, 2013 by Euan Long

I'm attempting to carry out a flow simulation to look at the temperatures within a solid; for purposes of simplicity I have created a cube to test on. The boundary conditions necessary are:

boundary conditions.png

The simulation uses air and titanium as the fluid and solid properties.

On applying these boundary conditions using "Total pressure" and "Static pressure" for the inlet and outlet flows respectively, the following cut plot is attained:

cut plot.png

Which looks OK until you realise that the minimum temperature, 955 K, is below any of the input conditions (min. 986 K at flow inlet).

From the moment of entry in fact, the flow looses heat (which does not make sense as it has a lower temperature than the rest of the block), see below: NB different temp. scale

cut plot.png

If anyone has any ideas on what is going on, and why this is an unsuccessful simulation, that would be greatly appreciated.

Additional comment: For the outlet I would like to set simply a pressure outlet without having to define end temperature which it asks for under thermodynamic properties - I think it is over-constrained as is...?

Thanks, Euan

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