Local energy equation for unsteady vibrations and acoustics prediction

Insights and additionnal clarifications concerning the energy diffusion. mo del [4] are in concern herein. We showed informer times under steady state conditions, that the diffusion model is well suited for an uncorrelated pla ne wave dynamics [7], energy behaviour modelling. We will prove, in this sh ort note, that the later is not enough when transient dynamics is in concer n. We thus propose a new equation alternative to the diffusion equation. (C ) 2001 Academie des sciences/Editions scientifiques et medicales Elsevier S AS.