After running the analysis, to output additional quantities, select them from this list, set the number of iterations to 0, and click Solve. These additional quantities will be available for viewing on the Results task.
By default, the film coefficient result quantity is calculated based on heat transfer results (thermal residual). However, sometimes it is advantageous to obtain film coefficient data based on the flow solution. This is accomplished by using an empirical correlation. The dialog is accessed by clicking the Options button on the Optional Post-Processor Output dialog. The dialog is shown:
Nu is the Nusselt number, Re is the local Reynolds number, and Pr is the Prandtl number. The flow solution is used to calculate the Reynolds and Prandtl numbers. Use either the default values for a, b, and c, or select new values. Note that the definition of Reynolds number and Nusselt number requires a length constant. If you are unsure what to use for these length scales, use the default of 1.
Vorticity is the measure of the spin (angular speed) of a fluid particle. The mathematical definition of vorticity is the curl of the velocity vector. Another way to look at it is that vorticity is twice the angular rotation (omega). Since omega is a measure of the net angular rotation, vorticity is a measure of the local spin of the fluid particle. (If omega, the angular velocity, = 0, then the flow is irrotational and the vorticity is zero.)