Some challenges in computational vibro-acoustics: verification, validation and medium frequencies

The simulation of the wave propagation phenomenon is one of the most challenging issue in the computational mechanics field. Many questions are still open among which we quote: the need for reliable error estimators, preferably in local or engineering quantities, the need for reliable updating methods with respect to material absorption parameters, and, finally, the need for more accurate numerical solutions, particularly to extend the frequency range that can be properly simulated by deterministic approaches. This paper gives an overview showing that the key issue to face all these challenges is the control of the pollution error, mainly caused by the dispersion effect.