Home / Examples / Acoustic Analysis [Mach] / Example 6: Reflection and Diffraction
Sound waves reflect and diffract at a rigid wall.
Unless specified in the list below, the default conditions will be applied.
Results will vary depending on Femtet version and the PC environment.
Item |
Settings |
Analysis Space |
2D |
Model Unit |
mm |
Item |
Settings |
Solver |
Acoustic Analysis [Mach] |
Analysis Type |
Harmonic Analysis |
Options |
N/A |
Tab |
Setting Item |
Settings |
Harmonic Analysis |
Frequency |
Minimum: 10,000 [Hz] Maximum: 10,000 [Hz] |
Open Boundary |
Coordinates of Origin |
x = 0 y = 0 |
A rigid wall is placed behind the sounder. The model is enclosed in a circle.
The open boundary condition is set on the circumference.
Body Number/Type |
Body Attribute Name |
Material Name |
13/Sheet |
AIR |
000_Air(*) |
* Available from the material DB
The [Speed] boundary condition is set on the face of the sounder and the [Open boundary] condition is set on the perimeter.
Boundary Condition Name/Topology |
Tab |
Boundary Condition Type |
Settings |
v/Edge |
Acoustic |
Speed |
1 [m/s] |
OPEN/Edge |
Acoustic |
Open Boundary |
|
The isosurface contour of the sound pressure [Pa] is shown below.
Most of sound waves reflect at the rigid wall. Some diffraction is observed.