Publications
95 results found
Charpentier TVJ, Neville A, Millner P, et al., 2013, An Investigation of Freezing of Supercooled Water on Anti-Freeze Protein Modified Surfaces, JOURNAL OF BIONIC ENGINEERING, Vol: 10, Pages: 139-147, ISSN: 1672-6529
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- Citations: 23
Berci M, Gaskell PH, Hewson RW, et al., 2013, A semi-analytical model for the combined aeroelastic behaviour and gust response of a flexible aerofoil, Journal of Fluids and Structures, Vol: 38, Pages: 3-21, ISSN: 0889-9746
Charpentier TVJ, Neville A, Millner P, et al., 2013, Development of anti-icing materials by chemical tailoring of hydrophobic textured metallic surfaces, JOURNAL OF COLLOID AND INTERFACE SCIENCE, Vol: 394, Pages: 539-544, ISSN: 0021-9797
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- Citations: 42
Berci M, Toropov VV, Hewson RW, et al., 2012, Multidisciplinary multifidelity optimisation of a flexible wing aerofoil for small UAV
The preliminary Multidisciplinary Design and Optimisation (MDO) of a flexible wing aerofoil apropos a small Unmanned Air Vehicle (UAV) is performed using a multifidelity model-based strategy. Both the passively adaptive structure and the shape of the flexible wing aerofoil are optimised for best aerodynamic performance under aero-structural constraints, within a coupled aeroelastic formulation. A typical flight mission for surveillance purposes is considered and includes the potential occurrence of wind gusts. A metamodel for the high-fidelity objective function and each of the constraints is built, based on a tuned low-fidelity one, in order to improve the efficiency of the optimisation process. Both metamodels are based on solutions of the aeroelastic equations for a flexible aerofoil but employ different levels of complexity and computational cost for modelling aerodynamics and structural dynamics within a modal approach. The high-fidelity model employs nonlinear Computational Fluid Dynamics (CFD) coupled with a full set of prescribed structural modes, whereas the low-fidelity one employs linear thin aerofoil theory coupled with a reduced set of the latter. The low-fidelity responses are then corrected according to few high-fidelity responses, as prescribed by an appropriate Design of Experiment (DOE), by means of a suitable tuning technique. A standard Genetic Algorithm GA) is hence utilised to find the global optimum, showing that a flexible aerofoil characterised by higher aerodynamic efficiency than its rigid counterpart. © 2012 by Vassili Toropov.
Gao L, Hewson RW, 2012, A multiscale frame work for EHL and micro-EHL, Tribology Transactions, Vol: 55, Pages: 713-722, ISSN: 1547-397X
Hewson RW, 2012, Approximate numerical method for lubrication with generalised Newtonian fluids, Tribology - Materials, Surfaces and Interfaces, Vol: 6, Pages: 142-145, ISSN: 1751-584X
Culmer PR, Barrie J, Hewson RW, et al., 2012, Reviewing the technological challenges associated with the development of a laparoscopic palpation device, International Journal of Medical Robotics and Computer Assisted Surgery, Vol: 8, Pages: 146-159
Jayne DJ, Culmer PR, Barrie JM, et al., 2011, Robotic platforms for general and colorectal surgery, Colorectal Disease, Vol: 13, Pages: 78-82, ISSN: 1462-8910
Surgeons are increasingly turning to new technologies to help them overcome the barriers imposed by minimally invasive surgery (MIS). Robotics is an enabling technology with obvious applications to MIS. This manuscript looks at robotic platforms for general surgical application and explores the advantages, limitations and possible future roles. © 2011 The Authors. Colorectal Disease © 2011 The Association of Coloproctology of Great Britain and Ireland.
Hewson RW, Kapur N, Gaskell PH, 2011, A two-scale model for discrete cell gravure roll coating, Chemical Engineering Science, Vol: 66, Pages: 3666-3674, ISSN: 0009-2509
A two-dimensional model for predicting the fluid pick out and coated film thickness characteristics of a discrete cell direct gravure roll coater operating in reverse mode is derived. A novel multiscale approach is adopted for this purpose and the resulting equations solved numerically for inertia-less flow conditions. A system of stiff ordinary differential equations is found to be sufficient to capture the major gross flow features, while at the cell level the analysis is based on a finite element solution of the momentum and continuity equations. It represents the first such predictive model of its kind, with particular interest placed on the nature of both the pressure distribution and web-to-roll gap profile spanning the coating bead. The effect of key operating parameters, web-to-roll speed ratio, web tension, wrap-angle, capillary number and cell-geometry, on the degree of fluid pick out from gravure cells and the coated film thickness is explored. Although an idealised model, the trends observed show qualitative agreement with existing experimental data collected on a small-scale gravure coating rig and point the way forward to the eventual formulation of a full three-dimensional predictive model of the process. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved.
Kapur N, Hewson RW, Sleigh PA, et al., 2011, A review of gravure coating systems, Convertech & e-Print, Vol: 1, Pages: 56-60, ISSN: 2185-6931
Berci M, Gaskell PH, Hewson RW, et al., 2011, Multifidelity metamodel building as a route to aeroelastic optimization of flexible wings, Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, Vol: 225, Pages: 2115-2137
Hewson RW, Kapur N, Gaskell PH, 2010, Tri-Helical Gravure Roll Coating, Chemical Engineering Science, Vol: 65, Pages: 1311-1321, ISSN: 0009-2509
Charpentier T, Milner P, Neville A, et al., 2010, Development of novel bio-inspired antifreeze surfaces, Vienna, Austria, Proceedings of the COST Strategic Workshop, Principles and Development of Bio-inspired Materials
Berci M, Toropov VV, Hewson RW, et al., 2010, Aeroelastic analysis and gust respons of a flexible airfoil, Orlando, Florida, USA, AIAA 6th Multidisciplinary Design Optimisation Specialist Conference
Hewson RW, Kapur N, Gaskell PH, 2009, A model for film-forming with Newtonian and shear-thinning fluids, Journal of Non-Newtonian Fluid Mechanics, Vol: 162, Pages: 21-28, ISSN: 0377-0257
Hewson RW, 2009, Free surface model derived from the analytical solution of stokes flow in a wedge, Journal of Fluids Engineering-Transactions of the ASME, Vol: 131, ISSN: 0098-2202
The formation of a thin liquid film onto a moving substrate is a commonly encountered industrial process, and one that is encountered in lubrication, oil extraction processes, and coating flows. The formation of such a film is analyzed via the analytical Stokes flow solution for the flow in a wedge bounded on one side by a free surface and on the other by a moving surface. The full solution is obtained by numerically integrating a set of ordinary differential equations from far downstream, in the region of the final film thickness. The results show excellent agreement with the results obtained by the Bretherton equation, the Ruschak equation, the Coyne and Elrod model, and a two-dimensional free surface finite element simulation of the problem.
Hewson RW, Kapur N, Gaskell PH, 2009, Modelling the discrete-cell gravure roll coating process, The European Physical Journal Special Topics, Vol: 166, Pages: 99-102, ISSN: 1951-6355
Berci M, Toropov VV, Hewson RW, et al., 2009, Metamodelling Based on High and Low Fidelity Model Interaction for UAV Gust Performance Optimization, Palm Springs, California, USA, AIAA 5th Multidisciplinary Design Optimization Specialist Conference
Haas A, Scholle M, Aksel N, et al., 2009, Laminar Thermal Mixing in Coating Flows, Milan, Italy, COMSOL Conference
Scholle M, Haas A, Aksel N, et al., 2009, The effect of locally induced flow structure on global heat transfer for plane laminar shear flow, International Journal of Heat and Fluid Flow, Vol: 30, Pages: 175-185, ISSN: 0142-727X
Heat transfer in a plane laminar shear flow configuration consisting of two infinitely long plates orientated parallel to each other is investigated theoretically. The upper plate, which is planar, drives the flow; the lower one, which is fixed, has a regular sinusoidally varying profile. A closed form analytical solution for velocity, based on lubrication theory, together with a semi-analytic one for temperature, from application of Ritz's direct method, is derived for creeping flow. In addition, detailed numerical solutions are obtained from a finite element formulation of the weak form of the governing equations for mass, momentum and energy (temperature) conservation, enabling the effects of inertia to be explored. It is shown that changes in the mean plate separation, that is the geometry, and the level of inertia present affect the local hydrodynamic flow structure in the form of kinematically and inertially induced eddies, respectively. These in turn impact on the local "laminar thermal mixing", and consequently enhance the global heat transfer. Results are reported for a wide range of Peclet, Reynolds and Nusselt numbers with agreement between the two methods of solution, for the case of creeping flow, found to be extremely good. The key flow features that emerge are (i) For creeping flow and varying Peclet number, the thermal field is asymmetric for all values of the Peclet number other than the limiting conditions of zero and infinity, at which extremes the corresponding thermal field is symmetric. In the limit of infinite Peclet number the eddy becomes a basin of fluid at uniform temperature. (ii) Global heat transfer in the case of creeping flow, expressed in terms of the Nusselt number, for a given Peclet number increases as the mean plate separation decreases, that is as the local kinematically induced eddy structure becomes more pronounced. (iii) There exists a subtle interplay between variations in the mean plate separation and the level of
Scholle M, Haas A, Aksel N, et al., 2009, Laminar Thermal Mixing in Coating Flows, Karlsruhe, Germany, European Coating Symposium
Hewson RW, Kapur N, Gaskell PH, 2009, Modelling the Discrete-Cell Gravure Roll Coating Process: A New Perspective, European Physical Journal Special Edition (European Coating Symposium 2007), Vol: 166, Pages: 99-102
Berci M, Toropov V, Hewson R, et al., 2009, Metamodelling Based on High and Low Fidelity Model Interaction for UAV Gust Performance Optimization, Palm Springs, California, 5th AIAA Multidisciplinary Design Optimization Specialist Conference
Berci M, Hewson R, Toropov V, et al., 2008, Multi-fidelity Modeling Strategy for Gust Performance Optimization of a Small UAV of Flexible Wing, Bath, UK, 7th ASMO-UK
Berci M, Hewson RW, Toropov VV, et al., 2008, A Multifidelity Modelling Strategy for Gust Perfomance Optimization of a Small UAV Flexible Wing, Bath, 7th International ASMO-UK/ISSMO conference on Engineering Design Optimization
Morina A, Hewson R, Neville A, et al., 2008, Cartilage Inspired Lubrication Mechanism, Biological Approaches for Engineering, Publisher: Biological Approaches for Engineering
Hewson RW, Kapur N, Gaskell PH, 2007, Analytical and numerical solutions of thin lubricating films for differing shear-thinning viscosity models, PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY, Vol: 221, Pages: 355-366, ISSN: 1350-6501
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- Citations: 4
Hewson RW, Kapur N, Gaskell PH, 2007, Analytical and numerical solution of thin lubricating films for differing shear-thinning viscosity models, P I MECH ENG J-J ENG, Vol: 221, Pages: 460-460, ISSN: 1350-6501
Hewson RW, Kapur N, Gaskell PH, 2006, A Theoretical and Experimental Investigation of Tri-Helical Gravure Roll Coating, Chemical Engineering Science, Vol: 61, Pages: 5487-5499
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