, but this code // executes before the first paint, when

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is not yet present. The // classes are added to so styling immediately reflects the current // toolbar state. The classes are removed after the toolbar completes // initialization. const classesToAdd = ['toolbar-loading', 'toolbar-anti-flicker']; if (toolbarState) { const { orientation, hasActiveTab, isFixed, activeTray, activeTabId, isOriented, userButtonMinWidth } = toolbarState; classesToAdd.push( orientation ? `toolbar-` + orientation + `` : 'toolbar-horizontal', ); if (hasActiveTab !== false) { classesToAdd.push('toolbar-tray-open'); } if (isFixed) { classesToAdd.push('toolbar-fixed'); } if (isOriented) { classesToAdd.push('toolbar-oriented'); } if (activeTray) { // These styles are added so the active tab/tray styles are present // immediately instead of "flickering" on as the toolbar initializes. In // instances where a tray is lazy loaded, these styles facilitate the // lazy loaded tray appearing gracefully and without reflow. const styleContent = ` .toolbar-loading #` + activeTabId + ` { background-image: linear-gradient(rgba(255, 255, 255, 0.25) 20%, transparent 200%); } .toolbar-loading #` + activeTabId + `-tray { display: block; box-shadow: -1px 0 5px 2px rgb(0 0 0 / 33%); border-right: 1px solid #aaa; background-color: #f5f5f5; z-index: 0; } .toolbar-loading.toolbar-vertical.toolbar-tray-open #` + activeTabId + `-tray { width: 15rem; height: 100vh; } .toolbar-loading.toolbar-horizontal :not(#` + activeTray + `) > .toolbar-lining {opacity: 0}`; const style = document.createElement('style'); style.textContent = styleContent; style.setAttribute('data-toolbar-anti-flicker-loading', true); document.querySelector('head').appendChild(style); if (userButtonMinWidth) { const userButtonStyle = document.createElement('style'); userButtonStyle.textContent = `#toolbar-item-user {min-width: ` + userButtonMinWidth +`px;}` document.querySelector('head').appendChild(userButtonStyle); } } } document.querySelector('html').classList.add(...classesToAdd); })(); Ken Visser | 黄大仙高手论坛

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Ken Visser

Professor
Engineering

Biography

Ken has had the opportunity to work at both NASA Langley in Virginia and the Boeing Aircraft Company after his graduate work, before joining Clarkson in 1998. He was involved in development and design aspects of the High Speed Civil Transport and the 767-400ER, the latter resulting in a novel wingtip patent flown on Boeing aircraft today.  Other fun activities included helping in the design of the America's Cup Team 2000, AmericaOne, and working with Fairchild Dornier Aircraft in Germany.  In 2006, Ken spent a year at the Deutsches Zentrum f眉r Luft- und Raumfahrt e.V. (DLR) in Braunschweig, Germany. He then went on to teach at Clarkson University and even developed a wind turbine prototype there as well. Now Ken finds himself leading the charge on the new Aerospace Engineering Concentration here at 黄大仙高手论坛. 

Education

Ph.D. - 1991 University of Notre Dame
M.S. - 1988 University of Notre Dame
B.Sc. - 1986 University of Calgary

Academic Interests

Ken鈥檚 research interests focus primarily on applied aerodynamics, including areas such as wind turbine design, drag reduction on ground vehicles, and aircraft wing design methodology. 

 

 

Recent Publications

Visser, K. D.: 鈥淥n the underperformance of the full-scale Clarkson University 3 meter ducted turbine 鈥, J. Phys.: Conf. Ser. 2767 072027, DOI 10.1088/1742-6596/2767/7/072027, TORQUE 2024, Florence, Italy, June 2024.

Safford, D., Wang, J., Liang, C., Visser, K..:鈥 Unsteady Reynolds-Averaged Navier-Stokes Simulations Of A Ducted Wind Turbine鈥, J. Fluids Eng. Paper No: FE-23-1203,  https://doi.org/10.1115/1.4063615

Ding, C., Zhang, B., Liang, C., Visser, K., and Yao, G.:鈥滺igh-Order Large-Eddy Simulations of a Wind Turbine in Ducted and Open-Rotor Configurations鈥, J. Fluids Eng. Paper No: FE-22-1281, https://doi.org/10.1115/1.4055989, February, 2023

Visser, K. D.: 鈥淩eal-world development challenges of the Clarkson University 3 meter ducted wind turbine鈥, J. Phys.: Conf. Ser. 2265 042072, https://doi.org/10.1088/1742-6596/2265/4/042072, June 2022.

Bagheri-Sadeghi, N., Helenbrook, B. T., and Visser, K. D.: 鈥淢aximal power per device area of a ducted turbine鈥, Wind Energ. Sci., 6, 1031-1041, https://doi.org/10.5194/wes-6-1031-2021, July 2021.

Kummer, A., DiMeo J., Hebel, M., and Visser, K.D. 鈥淥n the Use of Cambered Plate Airfoils for Small Wind Turbines鈥 J. Phys.: Conf. Ser. 1618 (2020) 042001 doi:10.1088/1742-6596/1618/4/042001, https://iopscience.iop.org/article/10.1088/1742-6596/1618/4/042001

Valyou, D.N. and Visser, K.D.: 鈥淒esign considerations for a small ducted wind turbine鈥,  J. Phys.: Conf. Ser. 1452 (2020) 012019, doi:10.1088/1742-6596/1452/1/012019 https://iopscience.iop.org/article/10.1088/1742-6596/1452/1/012019

Kanya, B. and Visser, K. D.: 鈥淓xperimental Validation of a Ducted Wind Turbine Design Strategy鈥, Wind Energ. Sci., 3, 919-928, Dec 2018 https://doi.org/10.5194/wes-3-919-2018

Bagheri-Sadeghi, N., Helenbrook, B.T., and Visser, K. D.: 鈥淒ucted wind turbine optimization and sensitivity to rotor position鈥, Wind Energ. Sci., 3, 221-229, https://doi.org/10.5194/wes-3-221-2018, April 2018.

Venters R, Helenbrook B.T, Visser KD. Ducted Wind Turbine Optimization. ASME. J. Sol. Energy Eng. 2017;140(1):011005-011005-8., doi:10.1115/1.4037741. Feb 2018

Kehs, J., Visser, K., Grossman, J., Niemiec, J. et al., "A Comparison of Full Scale Aft Cavity Drag Reduction Concepts With Equivalent Wind Tunnel Test Results," SAE Int. J. Commer. Veh. 6(2):2013, doi:10.4271/2013-01-2429.Streit, T, Visser, K., and Liersch, C.,鈥淢inimal Induced Drag for Non-Planar Lifting Surfaces with Moderate and Small Aspect Ratio鈥 New Results in Numerical and Experimental Fluid Mechanics VII (NNFM)  Vol 112, Springer 2010.

 

Ken Visser

Contact Me

EB 139 Engineering Building

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