8. F modeling

8.1. Characteristics of modeling

This modeling is based on acoustic finite elements with pressure degrees of freedom \(p\) from PHENOMENE =” ACOUSTIQUE “.

The free surface (group of nodes: NOSURF) is affected by a Dirichlet condition: PRES =0.0. This Dirichlet condition is performed by dualization (AFFE_CHAR_ACOU (PRES_IMPO)). This modeling gives access to only acoustic modes.

8.2. Characteristics of the mesh

The mesh contains: 513 HEXA8; 57 QUAD4.

8.3. Tested values

Identification	Reference (\(\mathit{Hz}\))
Acoustic mode 0, 0, 0	1166.67
Acoustic mode 1, 0, 0	1458.33
Acoustic mode 2, 0, 0	2103.24
Acoustic mode 3, 0, 0	2872.58
Acoustic mode 0, 0, 1	3500.00