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Nonlinear response of membranes to ocean waves using boundary and finite elements
Fluid-filled membrane structures could have several engineering applications in the ocean environment. They could be used as floating breakwaters, berm breakwaters and as storage bladders. Membrane structures are ideally suited to locations where dynamic distributed loads exist, such as the hydrodynamic loads with water waves. The behavior of a highly deformable membrane to ocean waves was studied by coupling a nonlinear boundary element model of the fluid domain to a nonlinear finite element model of the membrane. The hydrodynamic loadings induced by water waves are computed assuming large body hydrodynamics and ideal fluid flow and then solving the transient diffraction/radiation problem. Either linear waves or finite amplitude waves can be assumed in the model and thus the nonlinear kinematic and dynamic free surface boundary conditions are solved iteratively. The nonlinear nature of the boundary condition requires a time domain solution. To implicitly include time in the governing field equation, Volterra's method was used. The approach is the same as the typical boundary element method for a fluid domain where the governing field equation is the starting point. The difference is that in Volterra's method the time derivative of the governing field equation becomes the starting point. The boundary element model was then coupled through an iterative process to a finite element model of membrane structures. The coupled model predicts the nonlinear interaction of nonlinear water waves with highly deformable bodies. To verify the coupled model a large scale test was conducted in the OH Hinsdale wave Research Laboratory at Oregon State University on a 3-ft-diameter fabric cylinder submerged in the wave tank. The model data verified the numerical prediction of the structure displacements and of the changes in the wave field.
Nonlinear response of membranes to ocean waves using boundary and finite elements
Fluid-filled membrane structures could have several engineering applications in the ocean environment. They could be used as floating breakwaters, berm breakwaters and as storage bladders. Membrane structures are ideally suited to locations where dynamic distributed loads exist, such as the hydrodynamic loads with water waves. The behavior of a highly deformable membrane to ocean waves was studied by coupling a nonlinear boundary element model of the fluid domain to a nonlinear finite element model of the membrane. The hydrodynamic loadings induced by water waves are computed assuming large body hydrodynamics and ideal fluid flow and then solving the transient diffraction/radiation problem. Either linear waves or finite amplitude waves can be assumed in the model and thus the nonlinear kinematic and dynamic free surface boundary conditions are solved iteratively. The nonlinear nature of the boundary condition requires a time domain solution. To implicitly include time in the governing field equation, Volterra's method was used. The approach is the same as the typical boundary element method for a fluid domain where the governing field equation is the starting point. The difference is that in Volterra's method the time derivative of the governing field equation becomes the starting point. The boundary element model was then coupled through an iterative process to a finite element model of membrane structures. The coupled model predicts the nonlinear interaction of nonlinear water waves with highly deformable bodies. To verify the coupled model a large scale test was conducted in the OH Hinsdale wave Research Laboratory at Oregon State University on a 3-ft-diameter fabric cylinder submerged in the wave tank. The model data verified the numerical prediction of the structure displacements and of the changes in the wave field.
Nonlinear response of membranes to ocean waves using boundary and finite elements
Untersuchungen zu nichtlinearen Reaktionen von Membranen auf Ozeanwellen unter Nutzung von FEM und BEM
Broderick, L.L. (Autor:in) / Leonard, J.W. (Autor:in)
Ocean Engineering ; 22 ; 731-745
1995
15 Seiten, 12 Bilder, 19 Quellen
Aufsatz (Zeitschrift)
Englisch
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