Product: ABAQUS/Standard
AC1D2 AC1D3
AC2D3 AC2D4 AC2D6 AC2D8
AC3D4 AC3D6 AC3D8 AC3D10 AC3D15 AC3D20
ACAX3 ACAX4 ACAX6 ACAX8
The *MODEL CHANGE capability is applied to remove continuum acoustic elements during a steady-state acoustic analysis.
The models have dimensions 10.0 × 1.0 in the 
–
plane, with an out-of-plane dimension of 1.0.
Loading and boundary conditions:
The pressure at the left side of the model is constrained to equal one; there is a plane-wave radiation condition on the right side of the model. A steady-state solution at unit frequency is obtained. Then, one-half of the model is removed. When the elements are removed, the radiation condition is applied along the new external boundary.
The one-dimensional Helmholtz equation for steady-state acoustics is
is the acoustic wave number. Using the boundary conditions that 
at 
and that 
at 
, the solution for the continuum model is 
General test of AC1D2 elements in steady-state analysis.
AC1D3 elements.
AC2D3 elements.
AC2D4 elements.
AC2D6 elements.
AC2D8 elements.
AC3D4 elements.
AC3D6 elements.
AC3D8 elements.
AC3D10 elements.
AC3D15 elements.
AC3D20 elements.
ACAX3 elements.
ACAX4 elements.
ACAX6 elements.
ACAX8 elements.
ACINAX2 elements.
ACINAX3 elements.
ACIN2D2 elements.
ACIN2D3 elements.
ACIN3D3 elements.
ACIN3D4 elements.
ACIN3D6 elements.
ACIN3D8 elements.
