Westervelt APS DFD 2013

1. Fluid-Structure Interactions as Flow Propagates Tangentially Over a Flexible Plate with Application to Voiced Speech Production Andrea R. Westervelt Byron D. Erath Department of Mechanical and Aeronautical Engineering Clarkson University, Potsdam, NY American Physical Society Division of Fluid Dynamics 66th Annual Meeting November 2426, 2013 Pittsburgh, Pennsylvania 2. Objective1 Fluid-structure interactions Between a vortex ring and cantilevered flexible beam in axial flow Relates to impact of vortices on vocal folds Future applications Apply more directly to speech Energy harvesting in a flexible beam66th Annual APS DFD Meeting, November 26, 2013 3. Introduction2 Formation Areas of concentrated rotational motion Intraglottal flow separation Shear layer Effects in speech Cause pressure drop along vocal folds Assists in rapid closure Sources of sound Effects in energy harvesting Impact plate to create a voltageVorticity plot of regular vocal fold motion (Erath and Plesniak, 2010)66th Annual APS DFD Meeting, November 26, 2013 4. Research Questions3 How are the dynamics of a flexible beam affected as a vortex ring propagates tangentially over it? What effect will intraglottal vortices have on the dynamics of human vocal folds during phonation? Is this worth investigating?66th Annual APS DFD Meeting, November 26, 2013 5. Experimental Setup4 Rectangular tank filled with deionized water Tank dimensions: 4 x 1 x 2 Vortex generation Pressure-driven flow generated by timed solenoid release L/d (slug length to pipe diameter) ratio regulated by LabVIEW Beam properties 4 x 4 x 0.005 Offset from vortex output, 3-1/2 downstreamDiagram of experimental setup66th Annual APS DFD Meeting, November 26, 2013 6. 5Experimental Setup: Beam Properties66th Annual APS DFD Meeting, November 26, 2013 7. Experimental Setup: Data Analysis6 High-speed camera Integrated Design Tools MotionPro X3 Plus 35 mm lens Aperture: 16 100 frames per second Image contrast Laser Fluorescein Motion-tracking software IDT MotionSense MATLAB66th Annual APS DFD Meeting, November 26, 2013 8. Results766th Annual APS DFD Meeting, November 26, 2013 9. Results8Snapshots of vortex ring passing over plate from current experiment 66th Annual APS DFD Meeting, November 26, 2013 10. Results9Snapshots of vortex ring passing over plate from current experiment 66th Annual APS DFD Meeting, November 26, 2013 11. Results1066th Annual APS DFD Meeting, November 26, 2013 12. Discussion and Conclusions11 Voiced speech Movement Match stiffness Unknown mass ratio, external tension Circulation strength? Advection velocity? Energy Harvesting Small displacements Angle of impact Expand parameter regime66th Annual APS DFD Meeting, November 26, 2013 13. Future Works12 Scaling to speech Beam/vocal fold dimensions Nondimensional parameters Physiological parameters PIV system Vortex circulation Quiescence Energy harvesting Piezoelectric plate66th Annual APS DFD Meeting, November 26, 2013 14. 13AcknowledgementsThis research was supported by A Scholarship Program to Increase Retention in Engineering (ASPIRE) through Clarkson Universitys Community of Underrepresented Professional Opportunities (CUPO).66th Annual APS DFD Meeting, November 26, 2013 15. References14 Erath, B. D., & Plesniak, M. W. (2010). Viscous flow features in scaled-up physical models of normal and pathological vocal phonation. International Journal of Heat and Fluid Flow, 31(3), 468-481. doi:10.1016/j.ijheatfluidflow.2010.02.01466th Annual APS DFD Meeting, November 26, 2013