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This command is used to construct a four-node 3D acoustic viscous boundary quad element object based on a bilinear isoparametric formulation.

element AV3D4 $eleTag $node1 $node2 $node3 $node4 $matTag

$eleTag unique element object tag
$node1 ..$node4 4 end nodes
$matTag Material Tag of previously defined nD material

For further documentation and figures see attached:pdf

Code Developed by: Quan Gu, Yichao Gao and Zhijian Qiu