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Abstracts and Talk Materials

Biophysical Fluid Dynamics

Biophysical Fluid Dynamics

June 19-30, 2006

Short presentations by participants

Short presentations by participants

Silas Alben (New York University)

Flow-body interactions in fish swimming

Lisa Fauci (Tulane University)

Spirochetes and spermatozoa: Fluid dynamic models of microorganism
motility

The observed swimming behavior of a motile microorganism is the result of a complex interplay between mechanisms of internal force generation, the passive elastic properties of its structure, and a surrounding viscous fluid. In this talk, we will focus on two very different types of microorganisms: the spirochetes, which are a type of bacteria characterized by an efficient mode of motility that allows them to screw through viscous fluids and mucosal surfaces, and spermatozoa, that undulate as a result of the action of thousands of molecular motors positioned along the flagellum. We will present mathematical and computational models that couple the internal force generating mechanisms of these microorganisms with external fluid mechanics. We will describe our methodology, which includes both the method of regularized Stokeslets and the immersed boundary method. We will discuss recent successes as well as challenges associated with these models.

Raymond Goldstein (University of Arizona)

Lecture

Raymond Goldstein (University of Arizona)

Lecture

Raymond Goldstein (University of Arizona)

Lecture

Raymond Goldstein (University of Arizona)

Lecture

Raymond Goldstein (University of Arizona)

Lecture

Raymond Goldstein (University of Arizona)

Lecture

Raymond Goldstein (University of Arizona)

Lecture: Overview

Raymond Goldstein (University of Arizona)

Lecture

Raymond Goldstein (University of Arizona)

Lecture

Anette (Peko) Hosoi (Massachusetts Institute of Technology)

Optimizing Locomotion

Thomas Powers (Brown University)

Mechanics of Flagella

Michael J. Shelley (New York University)

Lecture

Michael J. Shelley (New York University)

Lecture

Michael J. Shelley (New York University)

Lecture

Michael J. Shelley (New York University)

Lecture

Michael J. Shelley (New York University)

Lecture

Michael J. Shelley (New York University)

Lecture

Michael J. Shelley (New York University)

Lecture

Michael J. Shelley (New York University)

Introduction to Biophysical Fluid Dynamics

Michael J. Shelley (New York University)

Lecture

Michael J. Shelley (New York University)

Lecture

Idan Tuval (University of Arizona)

Right Hand-Left Hand: On the Origins of Asymmetry in Vertebrates

Jane Wang (Cornell University)

Falling Paper and Dragonfly Flight

Charles Wolgemuth (University of Connecticut Health Center)

Two-phase Fluids and the Mechanics of Crawling Cells

Jun Zhang (New York University)

Unidirectional Forward Flight of a Flapping Wing

The locomotion of most fish and birds is realized by flapping wings or fins transverse to the direction of travel. Here, we study experimentally the dynamics of a wing that is flapped up and down but is free to move in the horizontal direction. In this table-top prototype experiment, we show that flapping flight occurs abruptly at a critical flapping frequency as a symmetry-breaking bifurcation. We then investigate the separate effects of the flapping frequency, the flapping amplitude, the wing geometry and the influence from the solid boundaries nearby. Through dimensional analysis, we found that there are two dimensionless parameters well describe this intriguing problem that deals with this fluid-solid interaction. The first one is the dynamical aspect ratio that combines four length scales, including the wing geometry and the flapping amplitude. The second parameter, the Strouhal number, relates the vertical flapping speed and its resultant forward flight speed. Overall, we emphasize the robustness of the thrust-generating mechanisms determining the forward flight speed of a flapping wing, as observed in our experiments.