PACINF
Bulk Data Entry Defines the properties of Acoustic Infinite Elements.
Format
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| PACINF | PID | MID | RIO | XP | YP | ZP |
Example
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| PACINF | 7 | 1 | 4 | 1.1 | 2.4 | 9.2 |
Definitions
| Field | Contents | SI Unit Example |
|---|---|---|
| PID | Unique property
identification number. No default (Integer > 0) |
|
| MID | Material identification
number of a MAT10 entry No default (Integer > 0) |
|
| RIO | Radial interpolation
order. 2
Default = 5 (0 < Integer < 12) |
|
| XP, YP, ZP | Coordinates of the pole of
the infinite elements (defined in the basic coordinate system).
1
3
No default (Real) |
Comments
- The location of the pole together with the connecting grid points of the element, define the geometry of the element.
- The radial interpolation order defines the order of the interpolation polynomial in the “infinite” direction. Higher values of RIO are generally expected to yield more accurate far-field results.
- The pole is the origin of the acoustic disturbance. In some geometries, the pole must be chosen so the distance between the pole and finite-infinite interface (defined by the element base connection points) is greater than the acoustic wavelength associated with the smallest excitation frequency.