A boundary element formulation based on energy flow is developed for the analysis of high frequency acoustic problems. Unlike traditionally modelled acoustic pressure and velocity variables, the variation of space-averaged energy density at high frequencies is rather smooth and therefore energy parameters are well suited for the description of acoustic behavior. The governing differential and integral equations based on energy variables are similar to the Helmholtz equations for acoustic problems based on pressure and velocity variables and thus the extension of existing solution techniques for the solution of integral equations based on energy flow parameters is rather straightforward.

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