Contact:C.H.K. Williamson (cw26@cornell.edu)
Phone:227-6176
Office/Lab:128-144 Upson Hall – Please visit us!
WEB SITE:
http://www.mae.cornell.edu/fdrl Anchor _Hlt78775848 _Hlt78775848
The Aircraft Wake Phenomenon - Project 1
This is an important problem to the US Air Force, and the FAA, since it concerns flight safety, where the tip-vortex wake of one aircraft can be a hazard to other maneuvering aircraft. Our approach is both visual and exciting in that fluid motions can be very beautiful, as well as important from the standpoint of fundamental vortex instabilities and turbulence. We shall study the motion and instabilities of these tip vortices, involving their small and long wavelength instabilities, and their interaction with the ground. Please come to 144 Upson Hall, and see the posters showing these phenomena, as well as take a look on the Web site, where you will find animations. Come and visit us in 144 Upson Hall!
Flow Visualisation! We will undertake flow visualisation as a part of this project, and this will involve digital cameras at high resolution, and techniques to visualise fluid flow, principally employing Laser-Induced Fluorescence. The project will be beautiful as well as scientific!
Facilities: We have built a novel Computer-controlled XY Towing Tank, a 26-foot Water Channel and also a Vortex Generator Facility, all of which will be used to visualize the trailing vortex pair wakes of aircraft, and problems in Vortex-induced vibrations in a set of projects suitable for bright MEng research! This work follows from several enjoyable projects over the last 3 years.
DPIV (Digital Particle Image Velocimetry). Exciting development of this front-line technique is needed as a part of the project. DPIV is a modern technique which enables us to determine the velocity and vorticity fields in 2D slices of a fluid, using the motions of neutrally-buoyant fluorescent particles. It is part of our Fluid Image Processing Center.
This project will give the student exposure to research computational analysis, design of a fluid mechanics experiment, the use of various flow visualization techniques, photography, video and also fluid mechanics instrumentation in challenging and important problems. The tools gained by the student will be exceedingly useful to future work in fluid mechanics and aerospace.
Contact:C.H.K. Williamson (cw26@corneAnchor
Phone:5-3838
Office/Lab:128-144 Upson Hall – Please visit us!
WEB SITE: http://www.mae.cornell.edu/fdrl
The Vortex-Induced Vibration Problem - Project 2
!worddav9a71ceceb21bdc9acac99f2ff5fa8e56.png|height=5040,width=4910!We shall study the phenomenon whereby bodies are induced to resonate due to the forcing from wake vortex dynamics. We shall employ the modern DPIV technique (see below) to study the vortex dynamics modes that give rise to different branches of amplitude response to the fluid forcing. We shall study to what extent the phenomena discovered for simple paradigm systems extend to more complicated arrangements - in particular we wish to explore where the concept of a critical mass is applicable in vortex-induced vibration systems. If the system mass falls below a critical value, then a resonance begins, and will persist at all flow speeds (to infinity). This is a radical new discovery, which has fundamental and practical significance, changing the way we view resonance in such systems. Come and visit us in 144 Upson Hall
Flow Visualisation! We will undertake flow visualisation as a part of this project, and this will involve digital cameras at high resolution, and techniques to visualise fluid flow, principally employing Laser-Induced Fluorescence. The project will be beautiful as well as scientific!
Facilities: We have built a novel Computer-controlled XY Towing Tank, a 26-foot Water Channel and also a Vortex Generator Facility, all of which will be used to visualize the trailing vortex pair wakes of aircraft, and problems in Vortex-induced vibrations in a set of projects suitable for bright MEng research! This work follows from several enjoyable projects over the last 3 years.
DPIV (Digital Particle Image Velocimetry). Exciting development of this front-line technique is needed as a part of the project. DPIV is a modern technique which enables us to determine the velocity and vorticity fields in 2D slices of a fluid, using the motions of neutrally-buoyant fluorescent particles. It is part of our Fluid Image Processing Center.
This project will give the student exposure to research computational analysis, design of a fluid mechanics experiment, the use of various flow visualization techniques, photography, video and also fluid mechanics instrumentation in challenging and important problems. The tools gained by the student will be exceedingly useful to future work in fluid mechanics and aerospace.