Unsteady Model of Sail and Flow Interaction

Maître, Olivier Le; Huberson, S.; Cursi, Eduardo Souza de

doi:10.1006/jfls.1998.0188

Cited by 25 publications

(23 citation statements)

References 12 publications

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“…This capability is also of interest for diagnostics or as a way of generating additional data for image simulation and rendering for education and training purposes. The method we use for stationary modeling of the closed valve is inspired by shape-finding finite element approaches applied to fabric ( [21] through [24]). We have chosen this approach because the valve leaflets are very thin structures made up of connective tissue with elastic properties (tensile, compressive and bending modulus) similar to some types of thin cloth and fabric.…”

Section: Computation Of the Closed Valve Configurationmentioning

confidence: 99%

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Patient-Specific Modeling and Analysis of the Mitral Valve Using 3D-TEE

Burlina

Sprouse

DeMenthon

et al. 2010

Lecture Notes in Computer Science

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Abstract. We describe a system dedicated to the analysis of the complex threedimensional anatomy and dynamics of an abnormal heart mitral valve using three-dimensional echocardiography to characterize the valve pathophysiology. This system is intended to aid cardiothoracic surgeons in conducting preoperative surgical planning and in understanding the outcome of "virtual" mitral valve repairs. This paper specifically addresses the analysis of threedimensional transesophageal echocardiographic imagery to recover the valve structure and predict the competency of a surgically modified valve by computing its closed state from an assumed open configuration. We report on a 3D TEE structure recovery method and a mechanical modeling approach used for the valve modeling and simulation.

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Section: Computation Of the Closed Valve Configurationmentioning

confidence: 99%

“…Our valve mechanical modeling is also novel and takes its inspiration from methods characterizing cloth and sail behavior [21] [22][23] [24]. Sections 2 and 3 describe our approaches for structure recovery and modeling, while Sections 4 and 5 report experimental results and conclude.…”

Section: Introductionmentioning

confidence: 99%

Patient-Specific Modeling and Analysis of the Mitral Valve Using 3D-TEE

Burlina

Sprouse

DeMenthon

et al. 2010

Lecture Notes in Computer Science

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“…2D steady laminar flow, turbulent flow, 3D unsteady, etc..), and then to solve the problem numerically by coupling a structural solver to a fluid dynamical solver. [5][6][7][8][9][10] As an example, Smith and Shyy 5 modeled the membrane airfoil as a two dimensional linear elastic membrane governed by the Young-Laplace equation. In their calculations, they assigned the membrane with a large modulus-sufficiently large to make the wing approximately inextensible-and excess length, and coupled the membrane solver with a Reynolds-averaged Navier-Stokes solver to compute equilibrium 2D configurations for the sail-like wing.…”

Section: Introductionmentioning

confidence: 99%

Shape, lift, and vibrations of highly compliant membrane wings

Waldman

Breuer

2013

43rd Fluid Dynamics Conference

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Membrane wings are common in flying animals such as bats, lemurs, flying squirrels, and pterosaurs, as well as in low Reynolds number Micro Air Vehicles. Vortices shed from the sharp leading and trailing edges and wingtips of membrane wings, and the vortex interactions with the membrane play an important role in the wing's performance. With compliant membrane wings that are initially tension-free at rest, there are two issues to consider: (a) the static relationship between the net aerodynamic forces and the bulk wing deformation, and (b) the interaction between the membrane dynamics and unsteady flow structures. We present a simple model of the finite deformation and natural frequency of an initially tension-free membrane wing, which depends only on an aeroelastic parameter. We extend our theory with a computer model that accounts for nonuniform chordwise load. We conduct experiments on low aspect ratio membrane wings with different support structures and thicknesses, over a broad range of freestream velocities and angles of attack. We measure wing shape and dynamics, aerodynamic force, and the wake, and find good agreement between the experimental results, the computer model, and our theoretical model. Membrane deformation affects the membrane vibration modes, which in turn affects the coupling between the membrane and vortex shedding. Wings with different wingtip support, but similar stiffness show similar static behavior, but exhibit markedly different dynamic behavior.

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“…Newman and Païdoussis (1991) have also investigated the stability of two-dimensional membranes at small incidences. An inviscid, unsteady flow model has been developed and applied to the study of harmonic perturbations of the trailing edge of sails and random inflow velocities by Le Maitre et al (1999). In order to understand the complex flow interactions engendered by low Reynolds number membrane wing MAVs, higher-fidelity viscous aeroelastic solvers are required to capture the relevant physical phenomena.…”

Section: Introductionmentioning

confidence: 99%