Toward perfectly absorbing boundary conditions for Euler equations

We examine the effectiveness of absorbing layers as nonreflecting computati onal boundaries for the Euler equations. The absorbing-layer equations are simply obtained by splitting the governing equations in the coordinate dire ctions and introducing absorption coefficients in each split equation. This methodology is similar to that used by Berenger for the numerical solution s of Maxwell's equations. Specifically, we apply this methodology to three physical problems-shock-vortex interactions, a plane free shear how, and an axisymmetric jet-with emphasis on acoustic wave propagation. Our numerical results indicate that the use of absorbing layers effectively minimizes nu merical reflection in all three problems considered.