This acoustic model enables you to account for the interaction between an acoustic pressure wave in a viscous fluid and a rigid wall for specific structures according to Low Reduced Frequency (LRF) approximation. For additional information, see the Low Reduced Frequency (LRF) Model topic in the Mechanical APDL Acoustic Analysis Guide.
Guidelines
See Low Reduced Frequency for guidelines in using a Low Reduced Frequency Model in an acoustic simulation.
Analysis Types
Low Reduced Frequency Model is an Acoustics Model that is available for the following analysis types.
Common Characteristics
This section describes the characteristics of the boundary condition, including the application requirements, support limitations, and loading definitions and values.
Dimensional Types
3D Simulation: Supported.
2D Simulation: Not Supported.
Scoping: The Low Reduced Frequency Model model is scoped bodies.
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 Low Reduced Frequency:
On the Environment Context tab: select > Low Reduced Frequency Model. Or, right-click the Environment tree object or click in the Geometry window and select > > Low Reduced Frequency Model.
Define body scoping.
Details View Properties
The selections available in the Details view are described below.
Category | Fields/Options/Description |
---|---|
Definition |
Type: Read-only field that describes the object - Low Reduced Frequency Model. Model Type: This property specifies the type of structure to be represented. It provides a drop-down with the options: (default), , and . Based on the Model Type property selection, one of the following properties displays:
Suppressed: Include ( - default) or exclude ( ) the boundary condition. |
Mechanical APDL References and Notes
The Low Reduced Frequency Model is applied using the command:
TB,AFDM,,,,TBOPT |
Where:
TBOPT = THIN for Model Type = .
TBOPT = RECT for Model Type = .
TBOPT = CIRC for Model Type = .
API Reference
See the Low Reduced Frequency section of the ACT API Reference Guide for specific scripting information.