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Home / Examples / Acoustic Analysis [Mach] / Example 17: Incident Plane Wave
Example 17: Incident Plane Wave
General
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Apply plane waves.
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Then, reflected waves are generated due to a hole in the model. The incident and reflected waves are displayed separately.
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Obtain this session's project file. (Right-click and choose 'Save link as')
Analysis Space
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Item |
Settings |
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Analysis Space |
2D |
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Model Unit |
m |
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Thickness in Depth Direction |
1 [m] |
Analysis Conditions
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Item |
Settings |
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Solver |
Acoustic Analysis |
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Analysis Type |
Harmonic Analysis |
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Options |
Incident Wave |
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Tab |
Item |
Settings |
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Harmonic Analysis |
Frequency |
Single Frequency 0.5 [kHz] |
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Sweep Setting |
Discrete Sweep |
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Options |
Select [Enable each port's individual weight setting for the field display]. |
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Incident Wave (plane wave) |
Propagation Direction |
(1, -1, 0) |
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Pressure (Sound Pressureļ¼ |
1 [Pa] Select [Sound Pressure [Pa]]. |
Model
A hole is provided in the body of air. The hole does not need any setting. It is treated as a rigid wall, which has been set for the outer boundary condition.
Body Attribute and Material Property Setting
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Body Number/Type |
Body Attribute Name |
Material Name |
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Body2/Sheet Body |
Body_Attribute_001 |
000_Air * |
* Available from the material DB
Boundary Conditions
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Boundary Condition Name/Topology |
Tab |
Boundary Condition Type |
Settings |
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Open/Edge |
Acoustic |
Open Boundary |
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Outer Boundary Condition |
Acoustic |
Rigid Wall |
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Results
How to separate incident and reflected waves, shown at the top of this page, is explained below.
1. Display the gradation contour of the sound pressure [Pa] of the result fields.
2. Go to Graphics Setting to click it, and select [Field Superposition Setting] on the pull-down menu. The dialog box will appear (Fig. 1)
3. Select [Synthetic Wave] for the Plane Wave field type and click the OK button. The superposed result of incident and reflected waves is displayed. (Left side of Fig. 2)
4. Select [Incident Wave] for the Plane Wave field type and click the OK button. The incident wave is displayed. (Center of Fig. 2)
5. Select [Reflected Wave] for the Plane Wave field type and click the OK button. The reflected wave is displayed. (Right side of Fig. 2)
Fig. 1 Field Superposition Settings dialog box
Fig. 2 Result Field Displays