Aerodynamics
Lifting Surface Tip Flows
The use of a raked tip has been shown to be a viable option for drag reduction in a manner similar to winglets. Local dihedral and sweep in the outboard tip region of a fixed wing have been studied in an effort to optimize this type of tip treatment. Parametric computational studies were conducted using TetrUSS from NASA Langley. Complimentary experimental studies were conducted to estimate lift and drag components from seven hole probe wake measurements in the Clarkson Subsonic Wind Tunnel. In particular, the impact on induced drag is being investigated as determined from the wake measurements.
Juncture Flows
The flow in the juncture region of two intersecting bodies can be subject to a wide range of conditions making optimal, drag reducing geometries difficult to achieve. Tailoring of the local geometry, such as with fillets, has been done in the past to minimize the impact of the juncture flow. New geometries ideas are being explored computationally and experimentally to reduce juncture flow drag.
Ken Visser
Associate Professor
Dept of Mechanical and Aeronautical Engineering
Clarkson University
PO Box 5725
CAMP Building 361
T: (315) 268 7687
Publications
Lee, M. and Visser, K.D., “Towards an Effective Nonplanar Wing Design Strategy,” AIAA 2016-4328, AIAA Aviation, 13-17 June 2016, Washington, D.C., 34th AIAA Applied Aerodynamics Conference
Streit, T, Visser, K., and Liersch, C.,“Minimal Induced Drag for Non-Planar Lifting Surfaces with Moderate and Small Aspect Ratio” New Results in Numerical and Experimental Fluid Mechanics VII (NNFM) Vol 112, Springer 2010.
Streit, Thomas und Visser, Kenneth und Liersch, Carsten (2008) Minimal Induced Drag for Non-Planar Lifting Surfaces with Moderate and Small Aspect Ratio in A. Dillmann, G.Heller, M.Klaas, H.-P. Kreplin, W.Nitsche, W. Schröder (Eds.), "New Results in Numerical and Experimental Fluid Mechanics VII", Notes on Numerical Fluid Mechanics and Multidisciplinary Design (NNFM), Vol. 112, Springer, 2010
Pomeroy, B. W., and Visser, K.D., “A Computational Study of Induced Drag Behavior for Spanwise Cambered Wings,” AIAA-2010-4227, 28th AIAA Applied Aerodynamics Conference, Chicago, IL., June 2010.
F.M. Payne, K.D. Visser and R.C. Nelson , “Leading Edge Vortex Flow Studies at the University of Notre Dame: Steady and Unsteady Investigations 1983-2000,” Chapter 7 in “Vortex Breakdown over Slender Delta Wings,” RTO-TR-AVT-080 AC/323(AVT-080)TP/253 , Research and Technology Organization, NATO, Neuilly-sur-Seine, Cedex, France. ISBN 978-92-837-0078-4 ed. N.G. Verhaagen, X.Z. Huang, October 2009
Liersch C., Streit T., Visser K, “Numerical Implications of Spanwise Camber on Minimum Induced Drag Configurations”, 47th AIAA Aerospace Conference, Orlando, January, 2009.
Streit, T, Visser, K., and Liersch, C.,“Minimal Induced Drag for Non-Planar Lifting Surfaces with Moderate and Small Aspect Ratio” 16th DGLR Symposium of STAB International Symposium of the German working Committee of Fluid Mechanics, RWTH Aachen University, Germany, November 3 to 4, 2008
Lazos, B. S., and Visser, K.D., “Aerodynamic Comparison of Hyper-Elliptic Cambered Span (HECS) Wings with Conventional Configurations,” AIAA-2006-3469, 25th AIAA Applied Aerodynamics Conference, San Francisco, CA., June 2006.
Visser, K.D., Ferrero Ferrero, M. del Carmen, and Nelson, R.C., “Physical Considerations of Leading Edge Flows,” CEAS/KATnet Conference, Bremen, Germany, June 2005.
Visser, K.D., Ferrero Ferrero, M. del Carmen, and Nelson, R.C., “Physical Considerations of Leading Edge Flows,” AIAA 2004-5083, 22nd Applied Aerodynamics Conference, Providence, RI, August 2004.
Gold, N.P. and Visser, K.D., “Aerodynamic Effects of Local Dihedral on a Raked Wing Tip,” AIAA-2002-0831, 40th AIAA Aerospace Sciences Meeting and Exhibit , January 14-17, 2002, Reno, NV.
Washburn, A.E.and Visser, K.D., “Evolution of Vortical Structures in the Shear Layers of Delta Wings,” 12th Applied Aerodynamics Conference, AIAA-94-2317, June 20-23, 1994 Colorado Springs, CO.
Visser, K.D. and Washburn, A.E., “Transition Behavior on Flat Plate Delta Wings ,” 12th Applied Aerodynamics Conference, AIAA-94-1850, June 20-23, 1994 Colorado Springs, CO.
Visser, K.D. and Nelson, R.C., “Measurements of Circulation and Vorticity in the Leading Edge Vortex of a Delta Wing,” AIAA Journal, Vol. 31, No. 1, pp. 104-111, January 1993.
Krist, S.L., Washburn, A.E., and Visser, K.D., “A Computational and Experimental Investigation of a Delta Wing with Vertical Tails,” 11th AIAA Computational Fluids Dynamics Conference, July 6-9, 1993.
Nelson, R.C. and Visser, K.D. “Breaking Down the Delta Wing Vortex /The Role of Vorticity in the Breakdown Process,” AGARD Symposium on Vortex Flow Aerodynamics, 1-4 October 1990, Scheveningen, The Netherlands.
Visser, K.D., Nelson, R.C., and Ng, T.T., “A Flow Visualization and Force Data Evaluation of Spanwise Blowing on Full and Half Span Delta Wings,” AIAA-89-0192, AIAA 27th Aerospace Sciences Meeting, January 9-12, 1989 Reno, NA.
Visser, K.D., Nelson, R.C., and Ng, T.T., “Method of Cold Smoke Generation for Vortex Core Tagging,” AIAA Journal of Aircraft, Vol. 25, No. 11, pp. 1069-1071, November 1988.
Visser, K.D., Iwanski, K.P., Nelson, R.C., and Ng, T.T., “Control of Leading Edge Vortex Breakdown by Blowing,” AIAA-88-0504, AIAA 26th Aerospace Sciences Meeting, January 11-14, 1988 Reno, NV.
