THREE DIMENSIONAL NONLINEAR ANALYSIS OF FLUID-MEMBRANE INTERACTION IN THE RECTANGULAR TANK

In the aerospace area, the fluid and rubberlike membrane interaction forming as the rubber bag in the solid container which has been used for the 3 axis control satellite. In this study, the rubberlike membrane together with nonlinear sloshing-like behaviour was used as the bladder tank container for interaction investigation. To overcome the moving boundary problem from the large deformation, an arbitrary Lagrangian-Eulerian (ALE) description was used to support the moving boundaries. The three dimensional analytic model of rubberlike membrane and fluid interaction was evaluated by ALE with finite element using Newmark-beta and Newton Raphson method and compared by sloshing model. The nonlinear behaviours of fluid-membrane interaction in rectangular tank under the vertical vibration were examined. The flow rate and pressure distribution, strain and stress distribution, and the displacement of membrane were discussed. According to many parametric calculations, we obtained some nonlinear characteristics. Successfully, the results confirmed that the nonlinearity of fluid was important in the larger amplitude excitation.