3.10. Static Pressure

An Static Pressure load applies a constant pressure to one or more bodies in the acoustic fluid regions.

Note:  If both Static Pressure and Temperature are defined, the ideal gas model is activated.

Analysis Types

The Static Pressure 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 Static Pressure 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 Static Pressure.

  • Body: Supported.

  • Face: Not Supported.

  • Edge: Not Supported.

  • Vertex: Not Supported.

  • Nodes: Not Supported.

  • Element: Not Supported.

  • Element Face: Not Supported.

Loading Types: This boundary condition’s loading is only applied to the volume of the selected topology.

Loading Data Definition: Loading data specified as a constant only.

Boundary Condition Application

To apply a Static Pressure:

  1. On the Environment Context tab: click Acoustic Loads>Static Pressure. Or, right-click the Environment tree object or in the Geometry window and select Insert>Acoustics>Static Pressure.

  2. Define the Scoping Method. Options include Geometry Selection (default) and Named Selection. For either scoping type, you must use the Body selection filter (on the Graphics Toolbar) for geometry selection or Named Selection definition. Only bodies specified in the acoustics Physics Region(s) can be selected or defined.

  3. Define the Magnitude of the pressure.

Details View Properties

The selections available in the Details view are described below.

CategoryFields/Options/Description
Scope

Scoping Method, options include:

  • Geometry Selection: Default setting, indicating that the boundary condition is applied to a geometry or geometries, which are chosen using a graphical selection tools.

    • Geometry (Body selection only): Visible when the Scoping Method property is set to Geometry Selection. Geometry (Body only) selections must be made on bodies specified in the acoustic Physics Region.

      Use the Body selection filter to pick your geometry, click in the Geometry field, and then click the Apply button that displays. After you select the geometry, this property displays the geometric entities (1 Body, 3 Bodies, etc.).

  • Named Selection: Indicates that the geometry selection is defined by a Named Selection.

    • Named Selection: Visible when the Scoping Method is set to Named Selection. This field provides a drop-down list of available user–defined Named Selections (body-based only).

Definition

Type: Read-only field that describes the object - Static Pressure.

Magnitude: Enter a constant pressure value.

Suppressed: Include (No - default) or exclude (Yes) the boundary condition.

Mechanical APDL References and Notes

Static Pressure is applied using the SPRE label of BF command. Also see the Non-Uniform Ideal Gas Material section in the Mechanical APDL Acoustic Analysis Guide for more information.

API Reference

See the Static Pressure section of the ACT API Reference Guide for specific scripting information.