6,104 research outputs found
CFD Study of the Impact of Variable Cant Angle Winglets on Total Drag Reduction
No full textWinglets are commonly used drag-reduction and fuel-saving technologies in today’s aviation. The primary purpose of the winglets is to reduce the lift-induced drag, therefore improving fuel efficiency and aircraft performance. Traditional winglets are designed as fixed devices attached at the tips of the wings. However, because they are fixed surfaces, they give their best lift-induced drag reduction at a single design point. In this work, we propose the use of variable cant angle winglets which could potentially allow aircraft to get the best all-around performance (in terms of lift-induced drag reduction), at different angle-of-attack values. By using computational fluid dynamics, we study the influence of the winglet cant angle and sweep angle in the performance of a benchmark wing at a Mach number of 0.8395. The results obtained demonstrate that by carefully adjusting the cant angle, the aerodynamic performance can be improved at different angles of attack
Variable cant angle winglets for improvement of aircraft flight performance
No full textTraditional winglets are designed as fixed devices attached at the tips of the wings. The primary purpose of the winglets is to reduce the lift-induced drag, therefore improving aircraft performance and fuel efficiency. However, because winglets are fixed surfaces, they cannot be used to control lift-induced drag reductions or to obtain the largest lift-induced drag reductions at different flight conditions (take-off, climb, cruise, loitering, descent, approach, landing, and so on). In this work, we propose the use of variable cant angle winglets which could potentially allow aircraft to get the best all-around performance (in terms of lift-induced drag reduction), at different flight phases. By using computational fluid dynamics, we study the influence of the winglet cant angle and sweep angle on the performance of a benchmark wing at Mach numbers of 0.3 and 0.8395. The results obtained demonstrate that by adjusting the cant angle, the aerodynamic performance can be improved at different flight conditions
Adjoint-aided Homogenisation for Flows Through Heterogeneous Membranes
No full textPorous membranes, like nets or filters, are thin structures that allow fluid to flow through their pores. Homogenisation can be used to rigorously link the flow velocity with the stresses on the membrane via several coefficients (e.g. permeability and slip) stemming from the solution of Stokes problems at the pore level. For a periodic microstructure, the geometry of a single pore determines these coefficients for the whole membrane. However, many biological membranes are not periodic, and the porous microstructure of industrial membranes can be modified to address specific needs, resulting in non-periodic patterns of solid inclusions and pores. In this case, multiple microscopic calculations are needed to retrieve the local non-periodic membrane properties, negatively affecting the efficiency of the homogenised model. In this paper, we introduce an adjoint-based procedure that drastically reduces the computational cost of these operations by computing the pore-scale solution's first- and second-order sensitivities to geometric modifications. This adjoint-based technique only requires the solution of a few problems on a reference geometry and allows us to find the homogenised solution on any number of modified geometries. This new adjoint-based homogenisation procedure predicts the macroscopic flow around a thin aperiodic porous membrane at a fraction of the computational cost of classical approaches while maintaining comparable accuracy.LFM
Kevin Brockmeier, Fiction Reading
No full textOctober 25, 2013, Ulrich Museum of Art, Wichita State UniversityAward winning author Kevin Brockmeier, reads from his work.University Libraries, Department of English, Department of Women's Studies, Watermark Books & Cafe, Ulrich Museum of Ar
Dr. Kevin Pelletier – Faculty Author Interview
No full textDr. Kevin Pelletier, Associate Professor of English, discusses his new book, Apocalyptic Sentimentalism: Love and Fear in US Antebellum Literature, published recently by the University of Georgia Press. The book provides powerful insights into the relationship between nineteenth-century sentimentality, religious discourse, and antislavery reform
Kevin Fenton: A Reading
No full textThe John S. Lucas Great River Reading Series (GRRS) hosts Winona native and author Kevin Fenton. Fenton will read from his new novel Cyan Magenta Yellow Black published by Black Lawrence Press, 2025.
Kevin Fenton is the author of Merit Badges, which won the AWP Prize for the Novel and the Friends of the American Writers Award, and Leaving Rollingstone, which Patricia Hampl called “the most important memoir to come out of the Midwest (or anywhere) in years.” He works as an advertising writer and creative director; in that capacity, he’s published essays in the design quarterlies Émigré and Eye (London), the anthology Looking Closer 2: Critical Writing On Graphic Design, and the UX design blog Boxes and Arrows. He got a slightly better education than he deserved at Beloit College, the University of Minnesota Law School, and the University of Minnesota MFA program. He lives in St Paul with his wife Ellen and his greyhound Evie
'Web of Life' - Profile of Kevin Petrie in Printmaking Today Winter 2024
No full textKevin Petrie, Professor of Creative Practice at the University of Sunderland, uses print to explore the novels and philosophy of Iris Murdoch writes Dr Miles Leeson. This is a 1200 word profile of Kevin Petrie and his recent work for 'Printmaking Today' which is the journal of the Royal Society of Painter Printmakers. The piece gives an overview of Petrie's creative practice focusing on the novels and thinking of Dame Iris Murdoch (1919-1999). The piece discusses Petrie's evolving model of creative practice for this project: reading the novels, sketching to visualise elements, developing and combining images in the studio and then reengagement with Murdoch (through the community, literature and archive). Petrie's 'Other Journeys' and 'Web of Life' exhibitions are discussed.
The author, Dr Miles Leeson, is the Director of the Iris Murdoch Research Centre at University of Chichester and Visiting Research Fellow at Kingston University. He is the lead editor of the Iris Murdoch Review, the Series Editor of ‘Iris Murdoch Today’ with Palgrave Macmillan, and has published widely on Murdoch’s work. He published Iris Murdoch: Philosophical Novelist (Continuum) in 2010, the edited collection Incest in Contemporary Literature (Manchester University Press, 2018), the festschrift Iris Murdoch: A Centenary Celebration (Sabrestorm Fiction, 2019), the edited collection Iris Murdoch and the Literary Imagination (Palgrave Macmillan, 2022) and is currently writing Iris Murdoch: Feminist.
Four prints by Kevin Petrie are reproduced with the text:
Untangle
2024
Etching from two plates with Chine Collé
Paper 38x29cm Image 14.8x12.5cm
Photo: Dave Williams
Friends
2023
Etching with Chine Collé
Paper 38x29cm Image 14.8x12.5cm
Photo: Dave Williams
Love
2023
Etching with Chine Collé
Paper 38x29cm Image 14.8x12.5cm
Photo: Dave Williams
What lies beneath
2024
Lithograph
38.5x28cm
Printed by Lee Turner at Hole Editions Newcastle
Photo: Dave William
Dr. Kevin Cherry – Faculty Author Interview
No full textDr. Kevin Cherry, Assistant Professor of Political Science,discusses his new book, Plato, Aristotle, and the Purpose of Politics, published recently by Cambridge University Press. In this book, he compares the views of Plato and Aristotle about the practice, study and the purpose of politics
Dr. Kevin Cruz - Faculty Author Interview
No full textDr. Kevin Cruz, Assistant Professor of Management in the Robins School of Business, discusses his recent article, “Perceptions of psychological contract breach and perceptions of co-worker exclusion: The moderating effects of collectivism and individualism,” in Occupational Health Science. Dr. Cruz’s research interests focus on employee – employer relationships, employee – team relationships and employee – co-worker relationships
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