3.1.10.89. ASI3D8 Element

This command constructs an eight-node quadrilateral fluid-structure interface element for coupled dam-reservoir analysis. The element connects four solid nodes (three displacement DOFs each) and four fluid nodes (one pressure DOF each). Use with compatible solid and fluid node DOF layouts in a 3D model.

element ASI3D8 $eleTag $N1 $N2 $N3 $N4 $N5 $N6 $N7 $N8

Argument

Type

Description

$eleTag

integer

unique element tag

$N1 $N2 $N3 $N4

integer

four solid-side interface nodes

$N5 $N6 $N7 $N8

integer

four fluid-side interface nodes

Note

  1. Pair with AC3D8 Element acoustic elements in the fluid domain and standard solid elements in the structure.

  2. The element enforces fluid-structure interaction tractions on the shared interface.

  3. Valid Element Recorder queries include force and stiffness.

Example

  1. Tcl Code

element ASI3D8 1 1 2 3 4 101 102 103 104

  1. Python Code

element('ASI3D8', 1, 1, 2, 3, 4, 101, 102, 103, 104)

Code developed by: Quan Gu, Yichao Gao, and Zhijian Qiu, Xiamen University