CHACAB

Bulk Data Entry

CHACAB – Acoustic Absorber Element Connection

Description

Defines the acoustic absorber element in coupled fluid-structural analysis.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
CHACAB	EID	PID	G1	G2	G3	G4	G5	G6
	G7	G8	G9	G10	G11	G12
			G17	G18	G19	G20

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
CHACAB	11	9	221	222	225	226	227	229
	321	323

Field	Contents
EID	Unique element identification number. No default (Integer > 0)
PID	Identification number of a PACABS property entry. Default = EID (Integer > 0)
Gi	Grid point identification numbers of connection points. Default = blank (Integer > 0)

Comments

1.	Element identification numbers should be unique with respect to all other element identification numbers.

2.	Grids G1 through G4 should be provided consecutively about one quadrilateral face. G5 through G8 should be provided on the opposite face with G5 opposite G1, G6 opposite G2, and so on.

The grids G9 to G20 are optional. If any edge connection point is blank or set to zero, the element formulations are modified to provide proper results for reduced number of connections. Corner grids cannot be deleted. The second continuation line is not mandatory. Additionally, it recommended that the edge points should be present within the mid-third of the edge.