Abstract
Theoretical work addition is derived in a form analogous to that of classical Rayleigh heat addition. From this derivation it is evident that work terms can be added to the Navier ‐Stokes momentum and energy equations representing work interaction. A second-law-based effectiveness parameter controlling the ratio of realizable work interaction to theideal work interaction isrequired fornonidealanalysis.Thus, thetheoreticallimitson work interaction are parameterized, and a method is developed for easily modeling isentropic and nonisentropic work interaction in computational e uid dynamics. This fundamental theoretical approach is independent of the method employed for the work interaction, that is, turbomachinery, magnetohydrodynamics, etc....
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