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

  1. The location of the pole together with the connecting grid points of the element, define the geometry of the element.
  2. 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.
  3. 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.