TY - GEN

T1 - Coupled FEM/BEM for fluid-structure interaction using ritz vectors and eigenvectors

AU - Seybert, A. F.

AU - Wu, T. W.

AU - Li, W. L.

PY - 1991

Y1 - 1991

N2 - In this paper, the finite element method (FEM) and the boundary element method (BEM) are combined together to solve a class of fluid-structure interaction problems. The FEM is used to model the elastic structure and the BEM is used to model the acoustic fluid. Quadratic isoparametric elements are used in both the FEM and BEM models. Continuity conditions of pressure and normal velocity are enforced at the fluid-structure interface on which the normal vector is not required to be uniquely defined. An enhanced CHIEF formulation is adopted to overcome the nonuniqueness difficulty at critical frequencies. To reduce the dimension of the coupled structural acoustic equations, the structural displacement is approximated by a linear combination of either Ritz vectors or eigenvectors. An error norm and a participation factor are defined so that it is possible to evaluate the accuracy of a solution and to omit vectors with small participation factors. Example problems are solved to examine the accuracy of the numerical solutions and to compare the efficiency of the Ritz vector and eigenvector syntheses.

AB - In this paper, the finite element method (FEM) and the boundary element method (BEM) are combined together to solve a class of fluid-structure interaction problems. The FEM is used to model the elastic structure and the BEM is used to model the acoustic fluid. Quadratic isoparametric elements are used in both the FEM and BEM models. Continuity conditions of pressure and normal velocity are enforced at the fluid-structure interface on which the normal vector is not required to be uniquely defined. An enhanced CHIEF formulation is adopted to overcome the nonuniqueness difficulty at critical frequencies. To reduce the dimension of the coupled structural acoustic equations, the structural displacement is approximated by a linear combination of either Ritz vectors or eigenvectors. An error norm and a participation factor are defined so that it is possible to evaluate the accuracy of a solution and to omit vectors with small participation factors. Example problems are solved to examine the accuracy of the numerical solutions and to compare the efficiency of the Ritz vector and eigenvector syntheses.

UR - http://www.scopus.com/inward/record.url?scp=0026407930&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0026407930&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:0026407930

SN - 0791808866

T3 - American Society of Mechanical Engineers, Noise Control and Acoustics Division (Publication) NCA

SP - 171

EP - 178

BT - Structural Acoustics

T2 - Winter Annual Meeting of the American Society of Mechanical Engineers

Y2 - 1 December 1991 through 6 December 1991

ER -