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Research Papers: Fluid-Structure Interaction

3D Modeling of Fluid-Structure Interaction With External Flow Using Coupled LBM and FEM

[+] Author and Article Information
Y. W. Kwon

Department of Mechanical and Astronautical Engineering, Naval Postgraduate School, Monterey, CA, 93943

J. C. Jo

 Korea Institute of Nuclear Safety, Taejon 305-338, Korea

J. Pressure Vessel Technol 130(2), 021301 (Mar 17, 2008) (8 pages) doi:10.1115/1.2892027 History: Received January 24, 2007; Revised July 12, 2007; Published March 17, 2008

Three-dimensional fluid-structure interaction was modeled using the coupled lattice Boltzmann and finite element methods. The latter technique was applied to model a structural behavior while the former was used to model a fluid field. For computationally efficient modeling of an external flow over embedded pipes with their interaction, the pipes were modeled using 3D beam elements rather than shell elements. This paper presented an algorithm on how to couple 3D beam elements with the lattice Boltzmann grids so that the fluid-structure interaction could be properly modeled at the outer surfaces of the pipes. Some numerical examples were analyzed using the developed technique, and the fluid-structure interaction characteristics were examined through the examples.

Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 7

Comparison of normalized velocities along the x-axis of the right pipes in the aligned positions with two different spacings, i.e., Cases A1 and A2

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Figure 8

Plot of fluid velocity vectors over staggered pipes with a close spacing at a given instant (Case B1)

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Figure 9

Normalized velocity along the z-axis of the right and left pipes of a staggered position with a close spacing between the pipes (Case B1)

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Figure 10

Normalized velocity along the x-axis of the right and left pipes of a staggered position with a far spacing between the pipes (Case B2)

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Figure 11

Normalized velocity along the z-axis of the right and left pipes of a staggered position with a far spacing between the pipes (Case B2)

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Figure 12

Comparison of normalized x-velocities of left pipes in a staggered position between near and far spacings, i.e., Cases B1 and B2

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Figure 13

Comparison of normalized z-velocities of left pipes in a staggered position between near and far spacings, i.e., Cases B1 and B2

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Figure 14

Comparison of normalized x-velocities of right pipes in a staggered position between near and far spacings, i.e., Cases B1 and B2

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Figure 15

Comparison of normalized z-velocities of right pipes in a staggered position between near and far spacings, i.e., Cases B1 and B2

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Figure 1

3D lattice (D3Q15) with 15 points showing discrete velocity vector directions; one black circle for the center node, six gray circles for face nodes, and eight white circles for corner nodes that show the discrete velocity directions in parentheses

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Figure 2

2D view of a pipe inside the lattice Boltzmann grid points

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Figure 3

A fluid grid point and a beam element representing a pipe

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Figure 4

A representative contact area of a fluid grid point denoted by a solid circle is shown by the gray area defined by bisecting all the lines connecting the grid point and the neighboring fluid grid points represented by open circles, all of which are in contact with the pipe’s outside surface

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Figure 5

Flow into a duct containing two flexible pipes, which are parallel to each other and normal to the duct’s longitudinal direction

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Figure 6

Normalized velocities along the x-axis of the right and left pipes in the aligned position with a close spacing (Case A1)

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