Example8 View by the Directivity Calculation Method

General

View the analysis results by the directivity calculation method.
Unless specified in the list below, the default conditions will be applied.

Analysis Space

Item	Settings
Analysis Space	3D
Model unit	mm

Analysis Conditions

Item	Settings
Solver	Acoustic Analysis [Mach]
Analysis Type	Static analysis
Options	N/A

Tab

Setting Item

Settings

Harmonic Analysis

Frequency

Minimum: 5[KHz]

Maximum: 5[KHz]

Graphical Objects

The model is to observe how the speaker’s sound travels for 1-meter distance in the air.

An area is extracted from the spherical ambient air for a speaker’s domain. Therefore, a body of speaker does not exist. The driving source is set at the pressure of 1 [Pa]. For easy viewing of the inside of the model, the open boundary condition is hidden. The directivity domain consists of two sheet bodies.

Body Attributes and Materials

Body Number/Type	Body Attribute Name	Material Name
2/Solid	Air	000_Air(*)
5/Solid	Air	000_Air(*)
6/Solid	Air	000_Air(*)
9/Sheet	OUTSIDE	000_Air(*)
10/Sheet	OUTSIDE	000_Air(*)

* Available from the Material DB

Body Attribute Name	Analysis Domain
OUTSIDE	Select “Use directivity calculation method”

If “Use directivity calculation method” is selected, such body will be recognized as the domain for the directivity calculation. The material “000_Air” is specified for this body but not used for the calculation. The simulation is performed assuming that the body material with open boundary condition exists in the outside of the boundary.

Boundary Conditions

Boundary Condition Name/Topology	Tab	Boundary Condition Type	Settings
F/Face	Acoustic	Pressure	1[Pa]
Open/Face	Acoustic	Open boundary

Results

The contour of the directivity domain has been made.

The sound pressure distribution in the wide space can be observed by using the directivity domain.

See other Acoustic Analysis examples.