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Dr Oliver G Harlen

Reader in Applied Mathematics
Faculty of MAPS

Contact details

Room: 9.07
Tel: +44 (0)113 3435189
Email: O.G.Harlen @ leeds.ac.uk

Keywords

Fluid Dynamics
Viscoelasticity
Polymers
Inkjets
Biomolecules
Suspensions
Ultrasound
Finite Elements

Research interests

Fluid dynamics of complex fluids such as polymer solutions, polymer melts and suspensions. These fluids do not obey the Navier-Stokes equation, but have a viscoelastic and nonlinear stress strain-rate relation due to their complex microscale structure. My research involves both developing constitutive models that capture this behaviour and predicting how these fluids flow in industrial applications.

Much of my current research is focussed on understanding how such fluid properties affect the performance of industrial inkjets (as part of an EPSRC programme grant on Industrial Inkjet Technology).

I am also studying methods for simulating large biomolecules, such as molecular motors, where the motion of interest occurs on timescales that are too long to be captured by atomistic simulations. Here we are using finite element methods to model the distortion of the biomolecules that result from thermal fluctuations.

Another area of my research is the scattering of ultrasound in colloidal suspensions, which can be used to determine the microstructure of these opaque suspensions.

Useful links

Innovation in Industrial Inkjet Technology
Centre for Doctoral Training in Fluid Dynamics
Centre for Doctoral Training in Soft Matter and Functional Interfaces

Publications

Hanson B; Harris S; Read D; Harlen O Fluctuating Finite Element Analysis: Development and Applications to Cytoplasmic DyneinBIOPHYSICAL JOURNAL, 329A-330A 2016

Hoath SD, Hsiao WK, Martin GD, Jung S, Butler SA, Morrison NF, Harlen OG, Yang LS, Bain CD, Hutchings IM Oscillations of aqueous PEDOT:PSS fluid droplets and the properties of complex fluids in drop-on-demand inkjet printing Journal of Non-Newtonian Fluid Mechanics, 223, 28-36, 2015
DOI:10.1016/j.jnnfm.2015.05.006
View abstract

Solernou A; Harris SA; Harlen OG; Read DJ; Smith KA; Muench SP Understanding fibrin protofibrils at the molecular level: formation and flexibility through a new coarse-grained protein modelling approach, 839-839 2015

Hanson B, Richardson R, Oliver R, Read DJ, Harlen O, Harris S Modelling biomacromolecular assemblies with continuum mechanics Biochemical Society Transactions, 43, 186-192, 2015
DOI:10.1042/BST20140294
View abstract

Harris SA, Hanson B, Richardson R, Read DJ, Harlen OG Mesoscale Modelling of Biomolecules using Continuum Mechanics BIOPHYSICAL JOURNAL, 108, 183A-183A, 2015

Mathues W, McIlroy C, Harlen OG, Clasen C Capillary breakup of suspensions near pinch-off Physics of Fluids, 27, 2015
DOI:10.1063/1.4930011
View abstract

Gray A, Harlen OG, Harris SA, Khalid S, Leung YM, Lonsdale R, Mulholland AJ, Pearson AR, Read DJ, Richardson RA In pursuit of an accurate spatial and temporal model of biomolecules at the atomistic level: a perspective on computer simulation. Acta Crystallogr D Biol Crystallogr, 71, 162-172, 2015
DOI:10.1107/S1399004714026777
View abstract

Richardson RA, Papachristos K, Read DJ, Harlen OG, Harrison M, Paci E, Muench SP, Harris SA Understanding the apparent stator-rotor connections in the rotary ATPase family using coarse-grained computer modeling. Proteins, 82, 3298-3311, 2014
DOI:10.1002/prot.24680
View abstract

Yang L, Kazmierski BK, Hoath SD, Jung S, Hsiao W-K, Wang Y, Berson A, Harlen O, Kapur N, Bain CD Determination of dynamic surface tension and viscosity of non-Newtonian fluids from drop oscillations Physics of Fluids, 26, 2014
DOI:10.1063/1.4901823
View abstract

Oliver R, Richardson RA, Hanson B, Kendrick K, Read DJ, Harlen OG, Harris SA Modelling the dynamic architecture of biomaterials using continuum mechanics In Protein Modelling, 175-197, 2014
DOI:10.1007/978-3-319-09976-7_8
View abstract

Hoath SD, Vadillo DC, Harlen OG, McIlroy C, Morrison NF, Hsiao W-K, Tuladhar TR, Jung S, Martin GD, Hutchings IM Inkjet printing of weakly elastic polymer solutions Journal of Non-Newtonian Fluid Mechanics, 205, 1-10, 2014
DOI:10.1016/j.jnnfm.2014.01.002
View abstract

McIlroy C, Harlen OG Modelling capillary break-up of particulate suspensions Physics of Fluids, 26, 2014
DOI:10.1063/1.4866789
View abstract

Hazlehurst TA, Harlen OG, Holmes MJ, Povey MJW Multiple scattering in dispersions, for long wavelength thermoacoustic solutions Journal of Physics: Conference Series, 498, 2014
DOI:10.1088/1742-6596/498/1/012005
View abstract

Hoyle DM, Auhl D, Harlen OG, Barroso VC, Wilhelm M, McLeish TCB Large amplitude oscillatory shear and Fourier transform rheology analysis of branched polymer melts Journal of Rheology, 58, 969-997, 2014
DOI:10.1122/1.4881467
View abstract

Hoath SD; Hsiao WK; Jung S; Yang LS; Bain CD; Wright SC; Morrison NF; Harlen OG; Martin GD; Hutchings IM Properties of PEDOT: PSS from oscillating drop studiesInternational Conference on Digital Printing Technologies, 299-303 2014
View abstract

Hoath SD; Vadillo DC; Harlen OG; Mcllroy C; Morrison NF; Hsiao WK; Tuladhar TR; Jung S; Martin GD; Hutchings IM DoD inkjet printing of weakly elastic polymer solutionsInternational Conference on Digital Printing Technologies, 152-156 2014
View abstract

Morrison NF; Harlen OG; Hoath SD Towards satellite free drop-on-demand printing of complex fluidsInternational Conference on Digital Printing Technologies, 162-165 2014
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Morrison NF; Harten OG Drop-on-demand printing of complex liquidsInternational Conference on Digital Printing Technologies, 271-276 2013
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McIlroy C, Harlen OG, Morrison NF Modelling the jetting of dilute polymer solutions in drop-on-demand inkjet printing Journal of Non-Newtonian Fluid Mechanics, 201, 17-28, 2013
DOI:10.1016/j.jnnfm.2013.05.007
View abstract

Hoath SD, Castrejen-Pita JR, Hsiao W-K, Jung S, Martin GD, Hutchings IM, Tuladhar TR, Vadillo DC, Butler SA, Mackley MR, McIlroy C, Morrison NF, Harlen OG, Yow HN Jetting of complex fluids Journal of Imaging Science and Technology, 57, 40403-1-4040310, 2013
DOI:10.2352/J.ImagingSci.Technol.2013.57.4.040403
View abstract

Hoath SD, Hsiao W-K, Jung S, Martin GD, Hutchings IM, Morrison NF, Harlen OG Drop speeds from drop-on-demand ink-jet print heads Journal of Imaging Science and Technology, 57, 2013
DOI:10.2352/J.ImagingSci.Technol.2013.57.1.010503
View abstract

Oliver R, Read DJ, Harlen OG, Harris SA A Stochastic Finite Element Model for the Dynamics of Globular Macromolecules Journal of Computational Physics, 239, 147-165, 2013
DOI:10.1016/j.jcp.2012.12.027
View abstract

Hwang WR, Harlen OG, Walkley MA An efficient iterative scheme for the highly constrained augmented Stokes problem for the numerical simulation of flows in porous media Korea-Australia Rheology Journal, 25, 55-64, 2013
DOI:10.1007/s13367-013-0006-9
View abstract

Hoyle DM, Huang Q, Auhl D, Hassell D, Rasmussen HK, Skov AL, Harlen OG, Hassager O, McLeish TCB Transient overshoot extensional rheology of long chain branched polyethylenes: experimental and numerical comparisons between filament stretching and cross-slot flow Journal of Rheology, 57, 293-313, 2013
DOI:10.1122/1.4767982
View abstract

Harlen OG; Castrejon-Pita JR; Castrejon-Pita A Asymmetric Detachment from Angled Nozzles Plates in Drop-on Demand Inkjet PrintingNIP29: 29TH INTERNATIONAL CONFERENCE ON DIGITAL PRINTING TECHNOLOGIES / DIGITAL FABRICATION 2013, 277-280 2013

Hoath SD, Hutchings IM, Harlen OG, McIlroy C, Morrison NF Regimes of polymer behaviour in drop-on-demand ink-jetting International Conference on Digital Printing Technologies, 408-411, 2012
View abstract

Vadillo DC, MacKley MR, Tembely M, Soucemarianadin A, Morrison NF, Harlen OG, Tembely M, Soucemarianadin A The matching of polymer solution fast filament stretching, relaxation, and break up experimental results with 1D and 2D numerical viscoelastic simulation Journal of Rheology, 56, 1491-1516, 2012
DOI:10.1122/1.4749828
View abstract

Hoath SD, Harlen OG, Hutchings IM Jetting behavior of polymer solutions in drop-on-demand inkjet printing Journal of Rheology, 56, 1109-1127, 2012
DOI:10.1122/1.4724331
View abstract

Yoon S, Walkley MA, Harlen OG Two particle interactions in a confined viscoelastic fluid under shear Journal of Non-Newtonian Fluid Mechanics, 185-186, 39-48, 2012
DOI:10.1016/j.jnnfm.2012.07.003
View abstract

Morrison NF, Harlen OG Inkjet printing of non-Newtonian fluids International Conference on Digital Printing Technologies, 360-364, 2011
View abstract

Hassell DG, Lord TD, Scelsi L, Klein DH, Auhl D, Harlen OG, McLeish TCB, Mackley MR The effect of boundary curvature on the stress response of linear and branched polyethylenes in a contraction-expansion flow RHEOLOGICA ACTA, 50, 675-689, 2011
DOI:10.1007/s00397-011-0551-4

Auhl D, Hoyle DM, Hassell D, Lord TD, Harlen OG, Mackley MR, McLeish TCB Cross-slot extensional rheometry and the steady-state extensional response of long chain branched polymer melts J RHEOL, 55, 875-900, 2011
DOI:10.1122/1.3589972

Hwang WR, Walkley MA, Harlen OG A fast and efficient iterative scheme for viscoelastic flow simulations with the DEVSS finite element method J NON-NEWTON FLUID, 166, 354-362, 2011
DOI:10.1016/j.jnnfm.2011.01.003

Castrejon-Pita JR, Morrison NF, Harlen OG, Martin GD, Hutchings IM Experiments and Lagrangian simulations on the formation of droplets in drop-on-demand mode PHYS REV E, 83, 2011
DOI:10.1103/PhysRevE.83.036306

Tenchev R, Gough T, Harlen OG, Jimack PK, Klein DH, Walkley MA Three dimensional finite element analysis of the flow of polymer melts J NON-NEWTON FLUID, 166, 307-320, 2011
DOI:10.1016/j.jnnfm.2010.12.008

Castrejon-Pita JR, Morrison NF, Harlen OG, Martin GD, Hutchings IM Experiments and Lagrangian simulations on the formation of droplets in continuous mode PHYS REV E, 83, 2011
DOI:10.1103/PhysRevE.83.016301

Harlen OG, Holmes MJ, Pinfield VJ, Povey MJW, Sleeman BD A perturbation solution for long wavelength thermoacoustic propagation in dispersions JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS, 234, 1996-2002, 2010
DOI:10.1016/j.cam.2009.08.101

Morrison NF, Harlen OG Viscoelasticity in inkjet printing RHEOLOGICA ACTA, 49, 619-632, 2010
DOI:10.1007/s00397-009-0419-z

Ahamadi M, Harlen OG Numerical study of the rheology of rigid fillers suspended in long-chain branched polymer under planar extensional flow J NON-NEWTON FLUID, 165, 281-291, 2010
DOI:10.1016/j.jnnfm.2010.01.002

Lord TD, Scelsi L, Hassell DG, Mackley MR, Embery J, Auhl D, Harlen OG, Tenchev R, Jimack PK, Walkley MA The matching of 3D Rolie-Poly viscoelastic numerical simulations with experimental polymer melt flow within a slit and a cross-slot geometry J RHEOL, 54, 355-373, 2010
DOI:10.1122/1.3306572

Hoyle DM, Harlen OG, Auhl D, McLeish TCB Non-linear step strain of branched polymer melts J RHEOL, 53, 917-942, 2009
DOI:10.1122/1.3143794

Scelsi L, Mackley MR, Klein H, Olmsted PD, Graham RS, Harlen OG, McLeish TCB Experimental observations and matching viscoelastic specific work predictions of flow-induced crystallization for molten polyethylene within two flow geometries J RHEOL, 53, 859-876, 2009
DOI:10.1122/1.3123209

Hassell DG, Hoyle D, Auhl D, Harlen O, Mackley MR, McLeish TCB Effect of branching in cross-slot flow: the formation of "W cusps" RHEOL ACTA, 48, 551-561, 2009
DOI:10.1007/s00397-009-0353-0

Graham RS, Bent J, Clarke N, Hutchings LR, Richards RW, Gough T, Hoyle DM, Harlen OG, Grillo I, Auhl D, McLeish TCB The long-chain dynamics in a model homopolymer blend under strong flow: small-angle neutron scattering and theory SOFT MATTER, 5, 2383-2389, 2009
DOI:10.1039/b817440g
View abstract

Graham RS, Bent J, Clarke N, Hutchings LR, Richards RW, Gough T, Hoyle DM, Harlen OG, Grillo I, Auhl D, McLeish TCB The long-chain dynamics in a model homopolymer blend under strong flow: small-angle neutron scattering and theory SOFT MATTER, 5, 2383-2389, 2009
DOI:10.1039/b817440g

Ahamadi M, Harlen OG A Lagrangian finite element method for simulation of a suspension under planar extensional flow J COMPUT PHYS, 227, 7543-7560, 2008
DOI:10.1016/j.jcp.2008.04.035

Hassell DG, Mackley MR, Sahin M, Wilson HJ, Harlen OG, McLeish TCB Molecular physics of a polymer engineering instability: Experiments and computation PHYS REV E, 77, 2008
DOI:10.1103/PhysRevE.77.050801

Hoyle DM; Harlen OG; McLeish TCB; Auhl D Non-linear step strain of branched polymer meltsXVTH INTERNATIONAL CONGRESS ON RHEOLOGY - THE SOCIETY OF RHEOLOGY 80TH ANNUAL MEETING, PTS 1 AND 2, 451-453 2008

Tenchev R; Harlen O; Jimack PK; Walkley MA Finite Element Modelling of Two- and Three-Dimensional Viscoelastic Polymer FlowsTRENDS IN ENGINEERING COMPUTATIONAL TECHNOLOGY, 81-101 2008

Malidi A; Harlen O Numerical simulations of suspensions of elastic particles in polymer meltsXVTH INTERNATIONAL CONGRESS ON RHEOLOGY - THE SOCIETY OF RHEOLOGY 80TH ANNUAL MEETING, PTS 1 AND 2, 641-643 2008

Ahamadi M; Harlen OG Rheology of suspensions derived from numerical simulationNUMIFORM '07: Materials Processing and Design: Modeling, Simulation and Applications, Pts I and II, 343-348 2007

Everitt SL, Harlen OG, Wilson HJ Bubble growth in a two-dimensional viscoelastic foam J NON-NEWTON FLUID, 137, 46-59, 2006
DOI:10.1016/j.jnnfm.2006.03.004

Everitt SL, Harlen OG, Wilson HJ Competition and interaction of polydisperse bubbles in polymer foams J NON-NEWTON FLUID, 137, 60-71, 2006
DOI:10.1016/j.jnnfm.2006.03.005

Graham RS, Bent J, Hutchings LR, Richards RW, Groves DJ, Embery J, Nicholson TM, McLeish TCB, Likhtman AE, Harlen OG, Read DJ, Gough T, Spares R, Coates PD, Grillo I Measuring and predicting the dynamics of linear monodisperse entangled polymers in rapid flow through an abrupt contraction. A small angle neutron scattering study MACROMOLECULES, 39, 2700-2709, 2006
DOI:10.1021/ma052357z

Pinfield VJ, Harlen OG, Povey MJW, Sleeman BD Scattering of Ultrasound by Particles SIAM Journal on Applied Mathematics, 66, 489-509, 2006

Pinfield VJ, Harlen OG, Povey MJW, Sleeman BD Acoustic propagation in dispersions in the long wavelength limit SIAM J APPL MATH, 66, 489-509, 2006
DOI:10.1137/04061698X

Collis MW, Lele AK, Mackley MR, Graham RS, Groves DJ, Likhtman AE, Nicholson TM, Harlen OG, McLeish TCB, Hutchings LR, Fernyhough CM, Young RN Constriction flows of monodisperse linear entangled polymers: Multiscale modeling and flow visualization J RHEOL, 49, 501-522, 2005
DOI:10.1122/1.1849180

Pinfield VJ, Harlen OG, Povey MJW, Sleeman BD ACOUSTIC PROPAGATION IN DISPERSIONS IN THE LONG WAVELENGTH LIMIT SIAM J APPL MATH, 66, 489-509, 2005
DOI:10.1137/04061698X

Everitt SL, Harlen OG, Wilson HJ, Read DJ Bubble dynamics in viscoelastic fluids with application to reacting and non-reacting polymer foams J NON-NEWTON FLUID, 114, 83-107, 2003
DOI:10.1016/S0377-0257(03)00108-3

Bent J, Hutchings LR, Richards RW, Gough T, Spares R, Coates PD, Grillo I, Harlen OG, Read DJ, Graham RS, Likhtman AE, Groves DJ, Nicholson TM, McLeish TCB Neutron-mapping polymer flow: Scattering, flow visualization, and molecular theory SCIENCE, 301, 1691-1695, 2003

Harlen OG, Holmes MJ, Povey MJW, Sleeman BD Acoustic propagation in dispersions and the geometric theory of diffraction SIAM J APPL MATH, 63, 834-849, 2003

Harlen OG The negative wake behind a sphere sedimenting through a viscoelastic fluid JOURNAL OF NON-NEWTONIAN FLUID MECHANICS, 108, 411-430, 2002

Lee K, Mackley MR, McLeish TCB, Nicholson TM, Harlen OG Experimental observation and numerical simulation of transient "stress fangs" within flowing molten polyethylene J RHEOL, 45, 1261-1277, 2001

Harlen OG, Holmes MJ, Povey MJW, Qiu Y, Sleeman BD A low frequency potential scattering description of acoustic propagation in dispersions SIAM J APPL MATH, 61, 1906-1931, 2001

Blackwell RJ, Harlen OG, McLeish TCB Theoretical linear and nonlinear rheology of symmetric treelike polymer melts MACROMOLECULES, 34, 2579-2596, 2001

Graham RS, McLeish TCB, Harlen OG Using the pom-pom equations to analyze polymer melts in exponential shear J RHEOL, 45, 275-290, 2001

Blackwell RJ; McLeish TCB; Harlen OG Molecular drag-strain coupling in branched polymer meltsMaterials Research Society Symposium - Proceedings 2000
View abstract

Blackwell RJ, McLeish TCB, Harlen OG Molecular Drag-Strain Coupling in Branched Polymer Melts Journal of Rheology, 44, 121-136, 2000
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Harlen O; Qiu Y; Sleeman B; Povey M Acoustic scattering in dis]dispersionsANALYTICAL AND COMPUTATIONAL METHODS IN SCATTERING AND APPLIED MATHEMATICS, 123-134 2000

Inkson NJ, McLeish TCB, Harlen OG, Groves DJ Predicting low density polyethylene melt rheology in elongational and shear flows with "pom-pom" constitutive equations J RHEOL, 43, 873-896, 1999

Harlen OG, Sundararajakumar RR, Koch DL Numerical simulations of a sphere settling through a suspension of neutrally buoyant fibres J FLUID MECH, 388, 355-388, 1999

Bishko GB, Harlen OG, McLeish TCB, Nicholson TM Numerical simulation of the transient flow of branched polymer melts through a planar contraction using the 'pom-pom' model JOURNAL OF NON-NEWTONIAN FLUID MECHANICS, 82, 255-273, 1999

Koch DL, Harlen OG Interfacial tension at the boundary between nematic and isotropic phases of a hard rod solution Macromolecules, 32, 219-226, 1999

Inkson N; McLeish T; Harlen O Modelling low density polyethylene rheology using the pom-pom modelPROGRESS AND TRENDS IN RHEOLOGY V, 336-337 1998

Harlen OG, Koch DL Orientational drift of a fibre suspended in a dilute polymer solution during oscillatory shear flow J NON-NEWTON FLUID, 73, 81-93, 1997

Harlen O Ten-bob swerver NEW SCI, 156, U1-U1, 1997

Bishko G, McLeish TCB, Harlen OG, Larson RG Theoretical molecular rheology of branched polymers in simple and complex flows: The pom-pom model PHYS REV LETT, 79, 2352-2355, 1997

Harlen OG Simulations of Viscoelastic Flows In The Mechanics of Thin Films, 366-374, 1996

Koch DL; Sundararajakumar AA; Harlen OG Dynamic simulations of fiber suspensions with mechanical contactsXIITH INTERNATIONAL CONGRESS ON RHEOLOGY, PROCEEDINGS, 604-605 1996

Bishko GB; Harlen OG; McLeish TCB; Bick D Molecular constitutive equation in a Lagrangian flow solver - bridging the gapXIITH INTERNATIONAL CONGRESS ON RHEOLOGY, PROCEEDINGS, 275-276 1996

HARLEN OG, RALLISON JM, SZABO P A SPLIT LAGRANGIAN-EULERIAN METHOD FOR SIMULATING TRANSIENT VISCOELASTIC FLOWS J NON-NEWTON FLUID, 60, 81-104, 1995

Szabo P; Hinch EJ; Rallison JM; Harlen OG Simulation of viscoelastic flow through a tube with a constrictionANNUAL TRANSACTIONS OF THE NORDIC RHEOLOGY SOCIETY, VOL 3, 1995, 3-5 1995

HARLEN OG, KOCH DL SIMPLE SHEAR-FLOW OF A SUSPENSION OF FIBERS IN A DILUTE POLYMER-SOLUTION AT HIGH DEBORAH NUMBER J FLUID MECH, 252, 187-207, 1993

HARLEN OG, HINCH EJ, RALLISON JM BIREFRINGENT PIPES - THE STEADY FLOW OF A DILUTE POLYMER-SOLUTION NEAR A STAGNATION POINT J NON-NEWTON FLUID, 44, 229-265, 1992

HARLEN OG, KOCH DL EXTENSIONAL FLOW OF A SUSPENSION OF FIBERS IN A DILUTE POLYMER-SOLUTION PHYS FLUIDS A-FLUID, 4, 1070-1073, 1992

HARLEN OG HIGH-DEBORAH-NUMBER FLOW OF A DILUTE POLYMER-SOLUTION PAST A SPHERE FALLING ALONG THE AXIS OF A CYLINDRICAL TUBE J NON-NEWTON FLUID, 37, 157-173, 1990

HARLEN OG, RALLISON JM, CHILCOTT MD HIGH-DEBORAH-NUMBER FLOWS OF DILUTE POLYMER-SOLUTIONS J NON-NEWTON FLUID, 34, 319-349, 1990

Walkley MA, Tenchev R, Gough T, Klein DH, Jimack PK, Harlen OG Finite element analysis of 3-d polymer melts Journal of Non-Newtonian Fluid Mechanics, 166, 307-320,
DOI:10.1016/j.jnnfm.2010.12.008

Greiciunas E, Wong J, Gorbatenko I, Hall J, Wilson MCT, Kapur W, Harlen OG, Vadillo D, Threlfall-Holmes P Design and operation of a Rayleigh Ohnesorge Jetting Extensional Rheometer (ROJER) to study extensional properties of low viscosity polymer solutions Journal of Rheology
View abstract