Imperial College London

ProfessorDemetriosPapageorgiou

Faculty of Natural SciencesDepartment of Mathematics

Chair in Applied Maths and Mathematical Physics
 
 
 
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Contact

 

+44 (0)20 7594 8369d.papageorgiou Website

 
 
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Location

 

750Huxley BuildingSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
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127 results found

Cimpeanu R, Papageorgiou DT, 2018, Three-dimensional high speed drop impact onto solid surfaces at arbitrary angles, International Journal of Multiphase Flow, ISSN: 0301-9322

© 2018 The rich structures arising from the impingement dynamics of water drops onto solid substrates at high velocities are investigated numerically. Current methodologies in the aircraft industry estimating water collection on aircraft surfaces are based on particle trajectory calculations and empirical extensions thereof in order to approximate the complex fluid-structure interactions. We perform direct numerical simulations (DNS) using the volume-of-fluid method in three dimensions, for a collection of drop sizes and impingement angles. The high speed background air flow is coupled with the motion of the liquid in the framework of oblique stagnation-point flow. Qualitative and quantitative features are studied in both pre- and post-impact stages. One-to-one comparisons are made with experimental data available from the investigations of Sor and García-Magariño (2015), while the main body of results is created using parameters relevant to flight conditions with droplet sizes in the ranges from tens to several hundreds of microns, as presented by Papadakis et al. (2004). Drop deformation, collision, coalescence and microdrop ejection and dynamics, all typically neglected or empirically modelled, are accurately accounted for. In particular, we identify new morphological features in regimes below the splashing threshold in the modelled conditions. We then expand on the variation in the number and distribution of ejected microdrops as a function of the impacting drop size beyond this threshold. The presented drop impact model addresses key questions at a fundamental level, however the conclusions of the study extend towards the advancement of understanding of water dynamics on aircraft surfaces, which has important implications in terms of compliance to aircraft safety regulations. The proposed methodology may also be utilised and extended in the context of related industrial applications involving high speed drop impact such as inkjet printing and

JOURNAL ARTICLE

Ray PK, Hauge JC, Papageorgiou DT, 2018, Nonlinear interfacial instability in two-fluid viscoelastic Couette flow, Journal of Non-Newtonian Fluid Mechanics, Vol: 251, Pages: 17-27, ISSN: 0377-0257

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Tomlin RJ, Kalogirou A, Papageorgiou DT, 2018, Nonlinear dynamics of a dispersive anisotropic Kuramoto-Sivashinsky equation in two space dimensions, PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, Vol: 474, ISSN: 1364-5021

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Anderson TG, Cimpeanu R, Papageorgiou DT, Petropoulos PGet al., 2017, Electric field stabilization of viscous liquid layers coating the underside of a surface, PHYSICAL REVIEW FLUIDS, Vol: 2, ISSN: 2469-990X

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Dubrovina E, Craster RV, Papageorgiou DT, 2017, Two-layer electrified pressure-driven flow in topographically structured channels, JOURNAL OF FLUID MECHANICS, Vol: 814, Pages: 222-248, ISSN: 0022-1120

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Game SE, Hodes M, Keaveny EE, Papageorgiou DTet al., 2017, Physical mechanisms relevant to flow resistance in textured microchannels, PHYSICAL REVIEW FLUIDS, Vol: 2, ISSN: 2469-990X

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Gomes SN, Kalliadasis S, Papageorgiou DT, Pavliotis GA, Pradas Met al., 2017, Controlling roughening processes in the stochastic Kuramoto-Sivashinsky equation, PHYSICA D-NONLINEAR PHENOMENA, Vol: 348, Pages: 33-43, ISSN: 0167-2789

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Gomes SN, Papageorgiou DT, Pavliotis GA, 2017, Stabilizing non-trivial solutions of the generalized Kuramoto-Sivashinsky equation using feedback and optimal control, IMA JOURNAL OF APPLIED MATHEMATICS, Vol: 82, Pages: 158-194, ISSN: 0272-4960

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Kirk TL, Hodes M, Papageorgiou DT, 2017, Nusselt numbers for Poiseuille flow over isoflux parallel ridges accounting for meniscus curvature, JOURNAL OF FLUID MECHANICS, Vol: 811, Pages: 315-349, ISSN: 0022-1120

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Moore MR, Mughal MS, Papageorgiou DT, 2017, Ice formation within a thin film flowing over a flat plate, JOURNAL OF FLUID MECHANICS, Vol: 817, Pages: 455-489, ISSN: 0022-1120

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Papaefthymiou ES, Papageorgiou DT, 2017, Nonlinear stability in three-layer channel flows, JOURNAL OF FLUID MECHANICS, Vol: 829, ISSN: 0022-1120

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Tomlin RJ, Papageorgiou DT, Pavliotis GA, 2017, Three-dimensional wave evolution on electrified falling films, JOURNAL OF FLUID MECHANICS, Vol: 822, Pages: 54-79, ISSN: 0022-1120

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Wray AW, Matar OK, Papageorgiou DT, 2017, Accurate low-order modeling of electrified falling films at moderate Reynolds number, PHYSICAL REVIEW FLUIDS, Vol: 2, ISSN: 2469-990X

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Wray AW, Papageorgiou DT, Matar OK, 2017, REDUCED MODELS FOR THICK LIQUID LAYERS WITH INERTIA ON HIGHLY CURVED SUBSTRATES, SIAM JOURNAL ON APPLIED MATHEMATICS, Vol: 77, Pages: 881-904, ISSN: 0036-1399

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Kalogirou A, Cimpeanu R, Keaveny EE, Papageorgiou DTet al., 2016, Capturing nonlinear dynamics of two-fluid Couette flows with asymptotic models, JOURNAL OF FLUID MECHANICS, Vol: 806, ISSN: 0022-1120

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Kalogirou A, Papageorgiou DT, 2016, Nonlinear dynamics of surfactant-laden two-fluid Couette flows in the presence of inertia, JOURNAL OF FLUID MECHANICS, Vol: 802, Pages: 5-36, ISSN: 0022-1120

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Thompson AB, Gomes SN, Pavliotis GA, Papageorgiou DTet al., 2016, Stabilising falling liquid film flows using feedback control, PHYSICS OF FLUIDS, Vol: 28, ISSN: 1070-6631

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Thompson AB, Tseluiko D, Papageorgiou DT, 2016, Falling liquid films with blowing and suction, JOURNAL OF FLUID MECHANICS, Vol: 787, Pages: 292-330, ISSN: 0022-1120

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Cimpeanu R, Papageorgiou DT, 2015, Electrostatically induced mixing in confined stratified multi-fluid systems, INTERNATIONAL JOURNAL OF MULTIPHASE FLOW, Vol: 75, Pages: 194-204, ISSN: 0301-9322

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Gomes SN, Pradas M, Kalliadasis S, Papageorgiou DT, Pavliotis GAet al., 2015, Controlling spatiotemporal chaos in active dissipative-dispersive nonlinear systems, PHYSICAL REVIEW E, Vol: 92, ISSN: 2470-0045

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Kalogirou A, Keaveny EE, Papageorgiou DT, 2015, An in-depth numerical study of the two-dimensional Kuramoto–Sivashinsky equation, Proceedings of the Royal Society A: Mathematical, Physical and Engineering Science, Vol: 471, Pages: 20140932-20140932, ISSN: 1364-5021

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Lin T-S, Pradas M, Kalliadasis S, Papageorgiou DT, Tseluiko Det al., 2015, COHERENT STRUCTURES IN NONLOCAL DISPERSIVE ACTIVE-DISSIPATIVE SYSTEMS, SIAM JOURNAL ON APPLIED MATHEMATICS, Vol: 75, Pages: 538-563, ISSN: 0036-1399

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Papaefthymiou ES, Papageorgiou DT, 2015, Vanishing viscosity limits of mixed hyperbolic–elliptic systems arising in multilayer channel flows, Nonlinearity, Vol: 28, Pages: 1607-1631, ISSN: 0951-7715

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Wang Q, Papageorgiou DT, Vanden-Broeck J-M, 2015, Korteweg–de Vries solitons on electrified liquid jets, Physical Review E, Vol: 91, ISSN: 1539-3755

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Wray AW, Papageorgiou DT, Craster RV, Sefiane K, Matar OKet al., 2015, Electrostatic suppression of the "coffee-stain effect", IUTAM SYMPOSIUM ON MULTIPHASE FLOWS WITH PHASE CHANGE: CHALLENGES AND OPPORTUNITIES, Vol: 15, Pages: 172-177, ISSN: 2210-9838

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Cimpeanu R, Papageorgiou DT, 2014, On the generation of nonlinear travelling waves in confined geometries using electric fields, PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, Vol: 372, ISSN: 1364-503X

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Cimpeanu R, Papageorgiou DT, Petropoulos PG, 2014, On the control and suppression of the Rayleigh-Taylor instability using electric fields, PHYSICS OF FLUIDS, Vol: 26, ISSN: 1070-6631

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Wray AW, Papageorgiou DT, Craster RV, Sefiane K, Matar OKet al., 2014, Electrostatic Suppression of the "Coffee Stain Effect", LANGMUIR, Vol: 30, Pages: 5849-5858, ISSN: 0743-7463

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Akrivis G, Papageorgiou DT, Smyrlis Y-S, 2013, On the analyticity of certain dissipative-dispersive systems, BULLETIN OF THE LONDON MATHEMATICAL SOCIETY, Vol: 45, Pages: 52-60, ISSN: 0024-6093

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Cimpeanu R, Papageorgiou DT, 2013, Electrohydrodynamically induced mixing in immiscible multilayer flows

In the present study we investigate electrostatic stabilization mechanismsacting on stratified fluids. Electric fields have been shown to control andeven suppress the Rayleigh-Taylor instability when a heavy fluid lies abovelighter fluid. From a different perspective, similar techniques can also beused to generate interfacial dynamics in otherwise stable systems. We aim toidentify active control protocols in confined geometries that induce timedependent flows in small scale devices without having moving parts. This effecthas numerous applications, ranging from mixing phenomena to electriclithography. Two-dimensional computations are carried out and several suchprotocols are described. We present computational fluid dynamics videos withdifferent underlying mixing strategies, which show promising results.

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