Hoyer, Klaus Werner, Dr.

Dr. Hoyer is currently Senior Research Associate at the Institute of Hydromechanics and Water Resources Management. His main field of interest is the development of scanning particle tracking velocimetry. He was recipient of a Research Fellowship from the German Academic Exchange Service (DAAD) (8/95-7/96). He earned his doctorate at ETH in 1994, conducting research in drag reduction of Non-Newtonian fluids in turbulent pipe flow. He used a customized Laser Doppler Velocimetry system to measure turbulent flow velocities. During this time he was also a teaching assistant in hydraulics. He was a post graduate researcher at the Ocean Engineering Lab at UCSB from 1998-1999 where he designed, built and implemented a quasi-3D single camera particle tracking system for the orbital velocity measurements of mechanically generated modulated waves. From 1999-2000 he was an engineering specialist for the Ocean Engineering Lab at UCSB. He implemented a stereoscopic particle tracking velocimetry system for the measurement of orbital and drift velocity of the water surface for mechanically and wind generated waves. Before joining the institute he was a self employed business consultant working in California as a lead investigator for a Phase II Navy SBIR program on high alpha aerodynamics for fighter aircraft (FA 18) (2000-2003).

Research Projects

• Development of Scanning Particle Tracking Velocimetry SPTV
• Lagrangian measurements of Vorticity and Material Elements

Publications

Hoyer K., Tulin M., A stereo video imaging system for surface particle tracking. In PIV and Modeling Water Wave Phenomena., Cambridge, UK, 17-19 April 2002. or: http://www.math.uio.no/~atlej/PIVWW2002/Abstracts/Hoyer.pdf

Matsiev D., Hoyer K., Tulin M.P., Surface Lagrangian Velocity Measurements for Breaking and Non-Breaking Modulated Waves and the Criterion for Breaking Inception, Submitted for Publication in JFM.

Kramer B., Hoyer K., Suarez C., Kerho M., Heid J., Dinovo R., Determination of nonlinear dynamic aerodynamic coefficients for aircraft.

Final report for Navy SBIR II Contract, N68335-97-C0283, Naval Air Systems Command
Patuxent River, MD 20670-1906, USA, 2000

Hoyer K., Technical Report TR98-177, Single camera surface particle tracking system., Ocean Engineering Lab, UCSB 1998.
Gasljevic K., Hoyer K, Matthys E. F., Temporary degradation and recovery of drag reducing surfactant solutions. Publication pending patent application

Gasljevic K., Hoyer K, Matthys E. F., Heat transfer control by temporary degradation of surfactant solutions. Publication pending patent application

Hoyer K. Gyr A. Heterogeneous drag Reduction - Concepts and Consequences Journal of Fluids Engineering, Trans. ASME, Vol. 120, 818-823, Dec. 1998

Hoyer K., Gyr A., Turbulent velocity field in heterogeneously drag reduced pipe flow. Journal of Non Newtonian Fluid Mechanics, 65, 221-240, 1996

Bewersdorff H.-W., Gyr A., Hoyer K., Sobolik V., Simultaneous wall shear rate measurements by a three segmented electrodiffusion probe and Laser Doppler Anemometry. Exp. in Fluids, 22, 281-285, 1997

Hoyer K., Bewersdorff H.-W., Gyr A., Tsinober A., An investigation of possible mechanisms of heterogeneous drag reduction in pipe and channel flows. Rheologica Acta 32, 140-149, 1993

Hoyer K., Bewersdorff H.-W., Gyr A., Tsinober A.,An investigation of possible mechanisms of heterogeneous drag reduction in pipe and channel flows. Near Wall Turbulent Flows , Ed. R.M.C. SO, C.G. Speziale, B.E. Launder, 679-687, 1993, Elsevier

Hoyer K., Bewersdorff H.-W., Gyr A., A study on thread ribblets. Applied Scientific Research, 52, 169-172, 1994
Hoyer K., Bewersdorff H.-W., Gyr A., Drag Reduction by an Elastic Rubber Band ?. Applied Scientific Research, 52, 161-168, 1994

Hoyer K., Gyr A., Tsinober A., On the mechanism of drag reduction in dilute polymer solutions. Applied Scientific Research, 55, 289-295, 1996

Hoyer K., Bewersdorff H.-W., Gyr A., Tsinober A., Studies on the mechanism of heterogeneous drag reduction. XI Congress of Rheology, Brussels, 183-185, 1992 in Theory & Applied Rheology, Elsevier

Hoyer K, Gyr A., Heterogeneous drag reduction. Actes du 12e Congres Francais de Mecanique, Strasbourg,Vol. 3, 313 - 316 (1995)

Hoyer K., Gyr A., Heterogeneous drag reduction, Concepts and Consequences. ASME Symposium proceedings: Turbulence modification and drag reduction. July 7-11 1996, San Diego

Hoyer K., Diss. ETH Nr. 10525, Heterogene Widerstandsverminderung in turbulenten Rohrstroemungen. Zurich, Switzerland 1994.