v8.22.101 AHLV101 - Anechoic Output Waveguide

Summary:

A rectilinear waveguide with anechoic output, with rigid walls, whose propagation medium is « normal » air, is excited by a harmonic incident wave, normal to the input face. The sound pressure field of the harmonic response is calculated using the elasto-acoustic formulation in pressure-displacement-displacement potential of the displacements.

The tests concern six different models (three-dimensional, two-dimensional and axisymmetric elasto-acoustic finite elements), they make it possible to validate the stiffness, mass, impedance and source vector matrices for the six models. The first three are for FORMULATION =”U_P_ PHI “, the next three for FORMULATION =”U_P” and the last three for FORMULATION =”U_ PSI”.

The reference result comes from an analytical calculation.

• 1. Reference problem
  • 1.1. Geometry
  • 1.2. Material properties
  • 1.3. Boundary conditions and loading
• 2. Benchmark solution
  • 2.1. Calculation method used for the reference solution
  • 2.2. Benchmark results
  • 2.3. Uncertainty about the solution
  • 2.4. Bibliographical references
• 3. Modeling A
  • 3.1. Characteristics of modeling
  • 3.2. Characteristics of the mesh
  • 3.3. Tested values
• 4. B modeling
  • 4.1. Characteristics of modeling
  • 4.2. Characteristics of the mesh
  • 4.3. Tested values
• 5. C modeling
  • 5.1. Characteristics of modeling
  • 5.2. Characteristics of the mesh
  • 5.3. Tested values
• 6. D modeling
  • 6.1. Characteristics of modeling
  • 6.2. Characteristics of the mesh
  • 6.3. Tested values
• 7. E modeling
  • 7.1. Characteristics of modeling
  • 7.2. Characteristics of the mesh
  • 7.3. Tested values
• 8. F modeling
  • 8.1. Characteristics of modeling
  • 8.2. Characteristics of the mesh
  • 8.3. Tested values
• 9. G modeling
  • 9.1. Characteristics of modeling
  • 9.2. Characteristics of the mesh
  • 9.3. Tested values
• 10. H modeling
  • 10.1. Characteristics of modeling
  • 10.2. Characteristics of the mesh
  • 10.3. Tested values
• 11. Modeling I
  • 11.1. Characteristics of modeling
  • 11.2. Characteristics of the mesh
  • 11.3. Tested values
• 12. Summary of results