Temat: acoustic fluid-structure interaction

Skocz do pozycji: 1.

Tytuł:: 2D Structural Acoustic Analysis Using the FEM/FMBEM with Different Coupled Element Types
Autorzy:: Chen, L.
Zhao, W.
Liu, C.
Chen, H.
Tematy:: boundary element method
finite element method
discontinuous boundary elements
acoustic fluid-structure interaction
fast multipole method; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/176330.pdf Link otwiera się w nowym oknie
Opis:: A FEM-BEM coupling approach is used for acoustic fluid-structure interaction analysis. The FEM is used to model the structure and the BEM is used to model the exterior acoustic domain. The aim of this work is to improve the computational efficiency and accuracy of the conventional FEM-BEM coupling approach. The fast multipole method (FMM) is applied to accelerating the matrix-vector products in BEM. The Burton-Miller formulation is used to overcome the fictitious eigen-frequency problem when using a single Helmholtz boundary integral equation for exterior acoustic problems. The continuous higher order boundary elements and discontinuous higher order boundary elements for 2D problem are developed in this work to achieve higher accuracy in the coupling analysis. The performance for coupled element types is compared via a simple example with analytical solution, and the optimal element type is obtained. Numerical examples are presented to show the relative errors of different coupled element types.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Eigencharacteristics of fluid filled tanks: an extended symmetrical coupled approach
Autorzy:: Wiśniewski, A.
Kucharski, R.
Tematy:: fluid-structure interaction
modal analysis
free vibration
acoustic method
FEM; Pokaż więcej
Wydawca:: Politechnika Gdańska
Powiązania:: https://bibliotekanauki.pl/articles/1933192.pdf Link otwiera się w nowym oknie
Opis:: In the numerical analysis of the eigen behaviour of large liquid and gas storage tanks, an important role is played by initial pre-stressing of such thin-walled structures due to high fluid pressure and gravity. In a majority of numerical simulations, the finite state of deformation is first calculated, following which small, linear vibrations are superimposed on the finite state. This paper is devoted to refinement and assessment of the basic Eckart superimposed eigencharacteristics problem simultaneously stated in fluid and thin-walled structures. Eckart's coupled approach leads to variational structure-fluid coupling in the so-called acoustic approximation. In order to verify the feasibility and correctness of the symmetrical Eckart approach, finite element discretization and a calculation example of a rectangular tank are presented. The calculated results are compared with literature ones.
Dostawca treści:: Biblioteka Nauki

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