Fluid shells interaction thesis

Diaz Find articles by V. Scambler Find articles by P. Burriesci Find articles by G. Abstract Modelling and simulation of heart valves is a challenging biomechanical problem due to anatomical variability, pulsatile physiological pressure loads and 3D anisotropic material behaviour.

Fluid shells interaction thesis

History Abstract 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. 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.

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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.

The fluid-structure interaction problem is formulated as a three-field system: Motion of the fluid domain is accounted for with the arbitrary Lagrangian-Eulerian formulation with two different mesh update strategies. The coupling between the fluid and the structure is performed with the strong coupling block Gauss-Seidel partitioned technique.

Fluid shells interaction thesis

Since the fluid-structure interaction problem is highly nonlinear, a relaxation technique based on Aitken's method is implemented in the strong coupling formulation to accelerate the convergence. Finally several example problems are presented in each field to verify the robustness and efficiency of the overall algorithm, many of them validated with reference solutions.

In civil engineering applications, their elegance, effectiveness and optimal material usage make these light weight structures an ideal construction element.

Fluid Structure Interaction Ansys Pdf

The introduction of new fiber materials, such as glass, carbon or aramide fibers with orthotropic material behavior have motivated a deep study of such elements which are used to build membrane and thin shell structures.

Membrane long span structure Moreover membrane and thin shell structures are characterized by their low flexural stiffness. Consequently these elements should not resist any compression at all. Therefore the usage of such construction materials is performed by introducing a prestressed force to the structure.

Prestressed membrane structure Other examples where light weight structures can be found include aircraft and spacecraft applications, parachutes, automobile airbags, sails, windmills and human tissues. Since this kind of structures are highly flexible systems, they are susceptible to wind loads applied to them.

Wind flow and structural motion may lead to aeroelastic instabilities which may cause important damage or even collapse of the structure. Maybe one of the most important examples of aeroelastic instabilities is the disaster of the Tacoma Narrows suspension bridge that took place in the U.Liu, Junjun () Interaction of magnetic field and flow in the outer shells of giant planets.

Dissertation (Ph.D.), California Institute of Technology. CaltechETD:etd This study of the interaction of magnetic field and flow in the outer shells of giant planets consists of three parts.

This is to certify that the work in this thesis entitled “Analysis for Water Hammer considering the effect of Fluid Structure Interaction in Straight Pipes ” by Suyash Mishra (ME), has been carried out under my supervision in partial fulfillment of the requirements for the.

FRACKING FLUID BY COMPUTING ITS CHEMICAL INTERACTION WITH ILLITE A Thesis in Geosciences by Oluwaseyi Ajayi of the Requirements for the Degree of Master of Science May ii The thesis of Oluwaseyi Ajayi was reviewed and approved* by the following: Michael Arthur also thank Shell for providing another year of funding for my graduate.

PhD position:Fluid-Structure Interactions in Hydraulic Turbine - Montreal Canada | iMechanica

In this paper, a fluid–structure interaction model for stability analysis of shells conveying fluid is developed. This model is developed for shells of arbitrary geometry and structure and is based on incompressible potential flow.

About Michael Tooley Michael Tooley is a Lead Technical Services Specialist at ANSYS, Inc Fluid structure interaction ansys pdf., specalizing in Fluid Structure Interaction simulations.

Fluid structure interaction ansys pdf. PARAMETRIC INVESTIGATIONS INTO FLUID-STRUCTURE INTERACTIONS IN HOVERING FLAPPING FLIGHT by Jesse Maxwell Thesis submitted to the Faculty of the Graduate School of the.

Interaction of magnetic field and flow in the outer shells of giant planets - CaltechTHESIS