For some reason, your energy equation is not converging. Please try out Keyur's suggestion to improve the overall mesh quality.
Also, do you have any natural convection effects you are trying to capture? If not, please change the Pressure Discretization for PRESTO! to Second Order.
Is your material 'Air'? If so, please change the density to a constant value. Once you do this, you should be able to turn-off the energy equation. If you are able to do this, could you please try and converge just your flow solution?
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