1. Reference problem

1.1. Geometry

It is a parallelepiped with a length \(1.m\) following \(x\), a width \(0.2m\) following, and a width following \(z\) and a depth \(0.1m\) following \(y\).

1.2. Material properties

• \(\rho =1.3\mathit{Kg}/\mathit{m³}\)

• \(c=343.+0.jm/s\)

1.3. Boundary conditions

The speed imposed on the group “ENTREE” is \(0.014+2.jm/s\).

The impedance imposed on the “SORTIE” group is \(445.9+3.jNs/m\) .

The pressure imposed on the “NO600” node is \(1.+3.jN/{m}^{2}\) .

The pressure imposed on the “NO500” node is \(1.+3.jN/{m}^{2}\) .