Hi,

My application involves cooling an object from an initial temperature (500C) in an array of air nozzles over 90 seconds. Running the simulation on the entire assembly is taking ridiculous amounts of time (I set it to run over the weekend, and Monday morning the solver had made it through under one second of physical time, and said it had over 800 hours of computation time left).

The individual nozzles solve quickly, when simulated as a steady-state flow problem. Is there a way to solve for the flow conditions, then assign the temperature to the part, and solve for the transient case?

I've been looking into the transferred boundary condition technique, but I'm either doing something wrong, or it's not a valid way to approach this.

Thanks,

Steve

How long does a steady state of all the nozzles take?

You should be able to setup the steady state and use it as the starting point even if you override the temp conditions of a component at the start. What is your work flow? Suggest you start with a simple model that you can post to get help.