Summary
Energy flux density in dissipative solids and fluids is investigated. First it is emphasized that inescapably ambiguities arise about the expression of the energy flux if the identification is merely based on possible splittings of the terms occurring in the energy equation. Then the energy flux density is determined for inhomogeneous waves in solids and fluids. New terms for solids are found in connection with transverse waves due to the complex-valuedness of the amplitude. The results for fluids are new and turn out to be qualitatively similar to those for solids.
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Caviglia, G., Morro, A. Energy flux in dissipative media. Acta Mechanica 94, 29–41 (1992). https://doi.org/10.1007/BF01177003
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DOI: https://doi.org/10.1007/BF01177003