Tesis doctoral de Jesús Gerardo Valdes Vazquez
Nowadays, fluid-structure interaction problems are a great challenge of different fields in engineering and applied sciences. In civil engineering applications, wind flow and structural motion may lead to aeroelastic instabilities on constructions such as long-span bridges, high-rise buildings and light-weight roof structures. On the other hand, biomechanical applications are interested in the study of hemodynamics, i.E. Blood flow through large arteries, where large structural membrane deformations interact with incompressible fluids. in the structural part of this work, a new methodology for the analysis of geometrically nonlinear orthotropic membrane and rotation-free shell elements is developed based on the principal fiber orientation of the material. A direct consequence of the fiber orientation strategy is the possibility to analyze initially out-of-plane prestressed membrane and shell structures. Additionally, since conventional membrane theory allows compression stresses, a wrinkling algorithm based on modifying the constitutive equation is presented. The structure is modeled with finite elements emerging from the governing equations of elastodynamics. the fluid portion of this work is governed by the incompressible navier-stokes equations, which are modeled by stabilized equal-order interpolation finite elements. Since the monolithic solution for these equations has the disadvantage that take great computer effort to solve large algebraic system of equations, the fractional step methodology is used to take advantage of the computational efficiency given by the uncoupling of the pressure from the velocity field. In addition, the generalized-a time integration scheme for fluids is adapted to be used with the fractional step technique. the fluid-structure interaction problem is formulated as a three-field system: the structure, the fluid and the moving fluid mesh solver. Motion of the fluid domain is accounted for with the arbitrary lagrangian-eulerian form
Datos académicos de la tesis doctoral «Nonlinear analysis of orthotropic membrane and shell structures including fluid-structure interaction.«
- Título de la tesis: Nonlinear analysis of orthotropic membrane and shell structures including fluid-structure interaction.
- Autor: Jesús Gerardo Valdes Vazquez
- Universidad: Politécnica de catalunya
- Fecha de lectura de la tesis: 18/10/2007
Dirección y tribunal
- Director de la tesis
- Eugenio Oñate Ibáñez De Navarra
- Tribunal
- Presidente del tribunal: sergio horacio Oller martínez
- María no Vázquez (vocal)
- salvador Botello rionda (vocal)
- guillaume Houzeaux (vocal)