Heat balances .... or lack of

Jason Norman

Has anyone come across a problem that, not matter how well 'converged' doesn't give anywhere near a proper heat balance when viewed according to: REPORT FLUXES

Total Heat Transfer Rate

Select all boundaries and then hit compute.

The problem is a combustion problem that is 'converged' so that all residuals are below 1e-7 and have all bottomed out with no noticeable change in any variable over 1000 iterations. Results look ok, but total heat transfer rate is miles off. For added info... the combustion 'box' is adiabatic (done to figure out what's going on). The mass flow rate balance in the flux reports is 1e-9 kg/s which I'm fairly happy with and the predicted exit gas composition is as expected.

By the way, the imbalance reported is such that I am getting twice as much heat out of the exit as I put in with the fuel. (patent pending......)