The Absorption Surface boundary condition enables you to dampen the effect of sound pressure on the impedance boundary as well as to approximate infinity.
Analysis Types
The Absorption Surface loading condition is available for Coupled Field Harmonic, Coupled Field Modal, Coupled Field Transient, Harmonic Acoustics, and Modal Acoustics analyses.
Common Characteristics
This section describes the characteristics of the boundary condition, including the application requirements, support limitations, and loading definitions and values.
Types Supported
3D Simulation: Supported.
2D Simulation: Not Supported.
Geometry Types: Geometry types supported for the Absorption Surface boundary condition include:
Solid: Supported.
Surface/Shell: Not Supported.
Wire Body/Line Body/Beam: Not Supported.
Topology: The following topology selection options are supported for Absorption Surface.
Body: Not Supported.
Face: Supported.
Edge: Not Supported.
Vertex: Not Supported.
Nodes: Not Supported.
Element: Not Supported.
Element Face: Not Supported.
Loading Data Definition: Enter loading data using one of the following options.
Constant
Tabular (Frequency Varying): Supported for Harmonic Acoustics only.
Boundary Condition Application
To apply a Absorption Surface:
On the Environment Context tab: click Acoustic Boundary Conditions>Absorption Surface. Or, right-click the Environment tree object or in the Geometry window and select Insert>Acoustics Absorption Surface.
Define the Scoping Method.
Define an
.
Details View Properties
The selections available in the Details view are described below.
Category | Fields/Options/Description |
---|---|
Scope |
Scoping Method, options include:
|
Definition |
Type: Read-only field that describes the object - Absorption Surface. Absorption Coefficient value for the selected boundary. This property can be designated as a parameter. : Specify anSuppressed: Include ( - default) or exclude ( ) the boundary condition. |
Mechanical APDL References and Notes
This boundary condition is applied using the SF command. Refer to the Boundary with Absorption Coefficient description in the Mechanical APDL Acoustic Analysis Guide for more information.
API Reference
See the Absorption Surface section of the ACT API Reference Guide for specific scripting information.