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2024

Grassia, Paul and Torres-Ulloa, Carlos and Hernández-Montelongo, Jacobo (2024) A cluster of N-bubbles driven along a channel at high imposed driving pressure : film orientations and bubble pressures. Proceedings of the Royal Society A : Mathematical, Physical and Engineering Sciences, 480 (2294). 20230722. ISSN 1471-2962

2023

Grassia, Paul and Rajabi, Hamed and Rosario, Ruben and Torres-Ulloa, Carlos (2023) Surfactant transport upon foam films moving through porous media. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 679. 132575. ISSN 0927-7757

Rajabi, Hamed and Rosario, Ruben and Grassia, Paul (2023) Transport of convected soluble surfactants on and within the foam film in the context of a foam fractionation process. Chemical Engineering Science, 281. 119100. ISSN 0009-2509

Grassia, Paul and Torres-Ulloa, Carlos (2023) A model for foam fractionation with spatially varying bubble size. Chemical Engineering Science, 281. 119163. ISSN 0009-2509

Torres-Ulloa, Carlos and Grassia, Paul (2023) Viscous froth model applied to multiple topological transformations of bubbles flowing in a channel : three-bubble case. Proceedings of the Royal Society A : Mathematical, Physical and Engineering Sciences, 479 (2275). 20220785. ISSN 1471-2962

Grassia, Paul (2023) Quasistatic model for foam fractionation. Chemical Engineering Science, 275. 118721. ISSN 0009-2509

Torres-Ulloa, Carlos and Grassia, Paul (2023) Foam propagation with flow reversal. Transport in Porous Media, 147 (3). pp. 629-651. ISSN 0169-3913

Rajabi, Hamed and Grassia, Paul (2023) Transport of soluble surfactant on and within a foam film in the context of a foam fractionation process. Chemical Engineering Science, 265. 118171. ISSN 0009-2509

2022

Boakye-Ansah, Y. A. and Grassia, P. (2022) Sensitivity of travelling wave solution to Richards equation to soil material property functions. Transport in Porous Media, 145. pp. 789-812. ISSN 0169-3913

Torres-Ulloa, C. and Grassia, P. (2022) Viscous froth model applied to the dynamic simulation of bubbles flowing in a channel : three-bubble case. Proceedings of the Royal Society A : Mathematical, Physical and Engineering Sciences, 478 (2267). 20220487. ISSN 1471-2962

Esmaeili, Elaheh and Grassia, Paul and Torres Ulloa, Carlos Alejandro (2022) Squeeze film flow of viscoplastic Bingham fluid between non-parallel plates. Journal of Non-Newtonian Fluid Mechanics, 305. 104817. ISSN 0377-0257

Grassia, P. (2022) Analysis of a model for surfactant transport around a foam meniscus. Proceedings of the Royal Society A : Mathematical, Physical and Engineering Sciences, 478 (2262). 20220133. ISSN 1471-2962

Grassia, Paul (2022) Electro-osmotic and viscous effects upon pressure to drive a droplet through a capillary. Proceedings of the Royal Society A : Mathematical, Physical and Engineering Sciences, 478 (2258). 20210801. ISSN 1471-2962

Torres-Ulloa, C. and Grassia, P. (2022) Viscous froth model applied to the motion and topological transformations of two-dimensional bubbles in a channel : three-bubble case. Proceedings of the Royal Society A : Mathematical, Physical and Engineering Sciences, 478 (2258). 20210642. ISSN 1471-2962

Alexander, Shirin and Barron, Andrew R. and Denkov, Nikolai and Grassia, Paul and Kiani, Sajid and Sagisaka, Masanobu and Shojaei, Mohammad Javad and Shokri, Nima (2022) Foam generation and stability : role of the surfactant structure and asphaltene aggregates. Industrial and Engineering Chemistry Research, 61 (1). 372–381. ISSN 0888-5885

2021

Grassia, Paul (2021) Surfactant transport between foam films. Journal of Fluid Mechanics, 928. F1. ISSN 0022-1120

Khadaroo, Sabeeha N.B.A. and Grassia, Paul and Gouwanda, Darwin and He, Jing and Poh, Phaik Eong (2021) Enhancing the biogas production and the treated effluent quality via an alternative palm oil mill effluent (POME) treatment process : integration of thermal pretreatment and dewatering. Biomass and Bioenergy, 151. 106167. ISSN 0961-9534

Boakye-Ansah, Yaw Akyampon and Grassia, Paul (2021) Similarity solutions for early-time constant boundary flux imbibition in foams and soils. European Physical Journal E, 44 (9). 111. ISSN 1292-8941

Shojaei, Mohammad Javad and Méheust, Yves and Osman, Abdulkadir and Grassia, Paul and Shokri, Nima (2021) Combined effects of nanoparticles and surfactants upon foam stability. Chemical Engineering Science, 238. 116601. ISSN 0009-2509

Boakye-Ansah, Y. A. and Grassia, P. (2021) Comparing and contrasting travelling wave behaviour for groundwater flow and foam drainage. Transport in Porous Media, 137 (1). pp. 255-280. ISSN 0169-3913

Torres-Ulloa, Carlos and Grassia, Paul (2021) Breakdown of similarity solutions : a perturbation approach for front propagation during foam improved oil recovery. Proceedings of the Royal Society A: Mathematical Physical and Engineering Sciences, 477 (2245). 20200691. ISSN 1471-2962

2020

Eneotu, M. and Grassia, P. (2020) Modelling foam improved oil recovery : towards a formulation for pressure- driven growth with flow reversal. Proceedings of the Royal Society A: Mathematical Physical and Engineering Sciences, 476 (2244). ISSN 1471-2962

Grassia, P. (2020) Viscous and electro-osmotic effects upon motion of an oil droplet through a capillary. Journal of Fluid Mechanics, 899. A31. ISSN 0022-1120

Khadaroo, Sabeeha N.B.A. and Grassia, Paul and Gouwanda, Darwin and Poh, Phaik Eong (2020) The impact of thermal pretreatment on various solid-liquid ratios of palm oil mill effluent (POME) for enhanced thermophilic anaerobic digestion performance. Journal of Cleaner Production, 261. 121159. ISSN 0959-6526

Khadaroo, Sabeeha N.B.A. and Grassia, Paul and Gouwanda, Darwin and Poh, Phaik Eong (2020) The influence of different solid-liquid ratios on the thermophilic anaerobic digestion performance of palm oil mill effluent (POME). Journal of Environmental Management, 257. 109996. ISSN 0301-4797

Vitasari, D. and Cox, S. and Grassia, P. and Rosario, R. (2020) Effect of surfactant redistribution on the flow and stability of foam films. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 476 (2234). 20190637. ISSN 1471-2962

2019

Khadaroo, Sabeeha N.B.A. and Poh, Phaik Eong and Gouwanda, Darwin and Grassia, Paul (2019) Applicability of various pretreatment techniques to enhance the anaerobic digestion of Palm Oil Mill Effluent (POME) : a review. Journal of Environmental Chemical Engineering, 7 (5). 103310. ISSN 2213-3437

Khadaroo, Sabeeha N.B.A. and Grassia, Paul and Gouwanda, Darwin and Poh, Phaik Eong (2019) Is the dewatering of Palm Oil Mill Effluent (POME) feasible? Effect of temperature on POME's rheological properties and compressive behavior. Chemical Engineering Science, 202. pp. 519-528. ISSN 0009-2509

Grassia, P. (2019) Motion of an oil droplet through a capillary with charged surfaces. Journal of Fluid Mechanics, 866. pp. 721-758. ISSN 0022-1120

Shojaei, Mohammad Javad and Osei-Bonsu, Kofi and Richman, Simon and Grassia, Paul and Shokri, Nima (2019) Foam stability influenced by displaced fluids and by pore size of porous media. Industrial and Engineering Chemistry Research, 58 (2). 1068–1074. ISSN 0888-5885

2018

Torres Ulloa, Carlos Alejandro and Berres, S. and Grassia, P. (2018) Foam-liquid front motion in Eulerian coordinates. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 474 (2220). 20180290. ISSN 1471-2962

Grassia, Paul and Ubal, Sebastiàn (2018) Streamline-averaged mass transfer in a circulating drop. Chemical Engineering Science, 190. pp. 190-218. ISSN 0009-2509

Osei-Bonsu, Kofi and Grassia, Paul and Shokri, Nima (2018) Effects of pore geometry on flowing foam dynamics in 3D-printed porous media. Transport in Porous Media, 124 (3). pp. 903-917. ISSN 0169-3913

Shojaei, Mohammad Javad and Osei-Bonsu, Kofi and Grassia, Paul and Shokri, Nima (2018) Foam flow investigation in 3D printed porous media : fingering and gravitational effects. Industrial and Engineering Chemistry Research, 57 (21). pp. 7275-7281. ISSN 0888-5885

Grassia, Paul (2018) Pressure-driven growth in strongly heterogeneous systems. European Physical Journal E, 41. 10. ISSN 1292-8941

2017

Grassia, P. (2017) Foam front displacement in improved oil recovery in systems with anisotropic permeability. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 534. pp. 44-51. ISSN 0927-7757

Grassia, P. and Lue, L. and Torres-Ulloa, C. and Berres, S. (2017) Foam front advance during improved oil recovery : similarity solutions at early times near the top of the front. Journal of Fluid Mechanics, 828. pp. 527-572. ISSN 0022-1120

Osei-Bonsu, Kofi and Grassia, Paul and Shokri, Nima (2017) Relationship between bulk foam stability, surfactant formulation and oil displacement efficiency in porous media. Fuel, 203. pp. 403-410. ISSN 0016-2361

Osei-Bonsu, Kofi and Grassia, Paul and Shokri, Nima (2017) Investigation of foam flow in a 3D printed porous medium in the presence of oil. Journal of Colloid and Interface Science, 490. pp. 850-858. ISSN 0021-9797

2016

Mas-Hernández, Elizabeth and Grassia, Paul and Shokri, Nima (2016) Modelling foam improved oil recovery within a heterogeneous reservoir. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 510. pp. 43-52. ISSN 0927-7757

Berres, Stefan and Maldonado, Linda and Grassia, Paul and Ventura-Medina, Esther and Magueijo, Vitor; (2016) Competencias necesarias en graduados de ingeniería según representantes de la industria regional Chilena. In: XXIX UFRO 2016 - Formación de Capital Humano en Ingeniería en el contexto de una Sociedad Global. Universidad de La Frontera, Temuco, Chile.

Grassia, P. and Torres-Ulloa, C. and Berres, S. and Mas-Hernández, E. and Shokri, N. (2016) Foam front propagation in anisotropic oil reservoirs. European Physical Journal E, 39 (4). 42. ISSN 1292-8941

Grassia, Paul and Ubal, Sebastian and Giavedoni, Maria Delia and Vitasari, Denny and Martin, Peter James (2016) Surfactant flow between a Plateau border and a film during foam fractionation. Chemical Engineering Science, 143. pp. 139-165. ISSN 0009-2509

Vitasari, D. and Grassia, Paul and Martin, Peter (2016) Surfactant transport onto a foam film in the presence of surface viscous stress. Applied Mathematical Modelling, 40. pp. 1941-1958. ISSN 0307-904X

Osei-Bonsu, Kofi and Shokri, Nima and Grassia, Paul (2016) Fundamental investigation of foam flow in a liquid-filled Hele-Shaw cell. Journal of Colloid and Interface Science, 462. pp. 288-296. ISSN 0021-9797

2015

Zhang, Yi and Grassia, Paul and Martin, Alastair and Usher, Shane P. and Scales, Peter J. (2015) Designing thickeners by matching hindered settling and gelled suspension zones in the presence of aggregate densification. Chemical Engineering Science, 134. pp. 297-307. ISSN 0009-2509

Osei-Bonsu, Kofi and Shokri, Nima and Grassia, Paul (2015) Surfactant dependent foam stability in the presence and absence of hydrocarbons : from bubble- to bulk-scale. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 481. pp. 514-526. ISSN 0927-7757

Mas-Hernández, Elizabeth and Grassia, Paul and Shokri, Nima (2015) Foam improved oil recovery : modelling the effect of an increase in injection pressure. European Physical Journal E, 38. 67. ISSN 1292-8941

Zhang, Yi and Grassia, Paul and Martin, Alastair and Usher, Shane P. and Scales, Peter J. (2015) Mathematical modelling of batch sedimentation subject to slow aggregate densification. Chemical Engineering Science, 128. pp. 54-63. ISSN 0009-2509

Mas-Hernández, Elizabeth and Grassia, Paul and Shokri, Nima (2015) Foam improved oil recovery : foam front displacement in the presence of slumping. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 473. pp. 123-132. ISSN 0927-7757

2014

Grassia, P. and Mas-Hernández, E. and Shokri, N. and Cox, S. J. and Mishuris, G. and Rossen, W. R. (2014) Analysis of a model for foam improved oil recovery. Journal of Fluid Mechanics, 751. pp. 346-405. ISSN 0022-1120

Grassia, Paul and Zhang, Yi and Martin, Alastair D. and Usher, Shane P. and Scales, Peter J. and Crust, Adam H. and Spehar, Rudolf (2014) Effects of aggregate densification upon thickening of Kynchian suspensions. Chemical Engineering Science, 111. pp. 56-72. ISSN 0009-2509

Ubal, Sebastián and Grassia, Paul and Campana, Diego M. and Giavedoni, Maria D. and Saita, Femando A. (2014) The influence of inertia and contact angle on the instability of partially wetting liquid strips : a numerical analysis study. Physics of Fluids, 26 (3). 032106. ISSN 1070-6631

2013

Satomi, Ryo and Grassia, Paul and Oguey, Christophe (2013) Modelling relaxation following T1 transformations of foams incorporating surfactant mass transfer by the Marangoni effect. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 438. pp. 77-84. ISSN 0927-7757

Vitasari, Denny and Grassia, Paul and Martin, Peter (2013) Simulation of dynamics of adsorption of mixed protein-surfactant on a bubble surface. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 438. pp. 63-76. ISSN 0927-7757

Vitasari, Denny and Grassia, Paul and Martin, Peter (2013) Surfactant transport onto a foam lamella. Chemical Engineering Science, 102. pp. 405-423. ISSN 0009-2509

Zhang, Yi and Martin, Alastair and Grassia, Paul (2013) Prediction of thickener performance with aggregate densification. Chemical Engineering Science, 101. pp. 346-358. ISSN 0009-2509

Satomi, Ryo and Grassia, Paul and Cox, Simon and Mishuris, Gennady and Lue, Leo (2013) Diffusion of curvature on a sheared semi-infinite film. Proceedings A: Mathematical, Physical and Engineering Sciences, 469 (2159). 20130359. ISSN 1471-2962

Zhang, Yi and Martin, Alastair and Grassia, Paul (2013) Mathematical modelling of time-dependent densified thickeners. Chemical Engineering Science, 99. pp. 103-112. ISSN 0009-2509

2012

Grassia, P. and Embley, B. and Oguey, C. (2012) A Princen hexagonal foam out of physicochemical equilibrium. Journal of Rheology, 56 (3). pp. 501-526. ISSN 1520-8516

Ubal, S. and Xu, B. and Derby, B. and Grassia, P. (2012) Continuous deposition of a liquid thread onto a moving substrate. Numerical analysis and comparison with experiment. Journal of Fluids Engineering, 134 (2). 021301. ISSN 0098-2202

Grassia, P. and Oguey, C. and Satomi, R. (2012) Relaxation of the topological T1 process in a two-dimensional foam. European Physical Journal E, 35. 64. ISSN 1292-8941

2011

Ran, L. and Jones, S.A. and Embley, B. and Tong, M.M. and Garrett, P.R. and Cox, S.J. and Grassia, P. and Neethling, S.J. (2011) Characterisation, modification and mathematical modelling of sudsing. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 382 (1-3). pp. 50-57. ISSN 0927-7757

Ubal, S. and Grassia, P. and Harrison, C.H. and Korchinsky, W.J. (2011) Reprint of numerical simulation of multi-component mass transfer in rigid or circulating drops : multi-component effects even in the presence of weak coupling. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 382 (1-3). 251–260. ISSN 0927-7757

Embley, B. and Grassia, P. (2011) Viscous froth simulations with surfactant mass transfer and Marangoni effects : deviations from Plateau's rules. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 382 (1-3). pp. 8-17. ISSN 0927-7757

Ubal, S. and Grassia, P. and Harrison, C.H. and Korchinsky, W.J. (2011) Numerical simulation of multi-component mass transfer in rigid or circulating drops : multi-component effects even in the presence of weak coupling. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 380 (1-3). pp. 6-15. ISSN 0927-7757

Grassia, P. and Usher, S.P. and Scales, P.J. (2011) Closed-form solutions for batch settling height from model settling flux functions. Chemical Engineering Science, 66 (5). pp. 964-972. ISSN 0009-2509

2010

Ubal, S. and Harrison, C.H. and Grassia, P. and Korchinsky, W.J. (2010) Numerical simulation of mass transfer in circulating drops. Chemical Engineering Science, 65 (10). pp. 2934-2956. ISSN 0009-2509

Shin, Dong-Youn and Grassia, Paul (2010) Preliminary study on the self-patterning and self-registration of metal electrodes by exploiting chemical and optical traits of an organic silver compound in conjunction with polyaniline. Journal of Micromechanics and Microengineering, 20 (2). 025030. ISSN 0960-1317

2009

Green, T. E. and Grassia, P. and Lue, L. and Embley, B. (2009) Viscous froth model for a bubble staircase structure under rapid applied shear : an analysis of fast flowing foam. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 348 (1-3). pp. 49-58. ISSN 0927-7757

Embley, B. and Grassia, P. (2009) Strain and liquid content of sheared stretching foams : a model for dynamic dilatancy. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 344 (1-3). pp. 24-32. ISSN 0927-7757

Bannerman, Marcus N. and Green, Thomas E. and Grassia, Paul and Lue, Leo (2009) Collision statistics in sheared inelastic hard spheres. Physical Review E, 79 (4). 041308. ISSN 2470-0053

Korchinsky, W.J. and Grassia, P. and Harrison, C.H. (2009) Multicomponent mass transfer in films and rigid drops : the influence of concentration-variable diffusivity. Chemical Engineering Science, 64 (3). pp. 433-442. ISSN 0009-2509

2008

Grassia, P. and Usher, S.P. and Scales, P.J. (2008) A simplified parameter extraction technique using batch settling data to estimate suspension material properties in dewatering applications. Chemical Engineering Science, 63 (7). pp. 1971-1986. ISSN 0009-2509

Grassia, P. and Montes-Atenas, G. and Lue, L. and Green, T. E. (2008) A foam film propagating in a confined geometry : analysis via the viscous froth model. European Physical Journal E - Soft Matter, 25 (1). pp. 39-49. ISSN 1292-8941

2007

Embley, B. and Grassia, P. (2007) Effects of volume conservation on Plateau border sag in foams. Philosophical Magazine, 87 (36). pp. 5697-5718. ISSN 1478-6435

Embley, B. and Grassia, P. (2007) A single sagging Plateau border. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 309 (1-3). pp. 20-29. ISSN 0927-7757

2006

Green, T. E. and Bramley, A. and Lue, L. and Grassia, P. (2006) Viscous froth lens. Physical Review E, 74 (5). 051403. ISSN 2470-0053

Embley, B. and Grassia, P. (2006) Mechanisms for the onset of convective instability in foams. Philosophical Magazine Letters, 86 (6). pp. 385-394. ISSN 1362-3036

Grassia, P. and Neethling, S.J. and Cervantes, C. and Lee, H.T. (2006) The growth, drainage and bursting of foams. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 274 (1-3). pp. 110-124. ISSN 0927-7757

2005

Grassia, P. and Neethling, S.J. (2005) Quasi-one-dimensional and two-dimensional drainage of foam. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 263 (1-3). pp. 165-177. ISSN 0927-7757

Neethling, S.J. and Lee, H.T. and Grassia, P. (2005) The growth, drainage and breakdown of foams. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 263 (1-3). pp. 184-196. ISSN 0927-7757

Shin, Dong-Youn and Grassia, Paul and Derby, Brian (2005) Oscillatory incompressible fluid flow in a tapered tube with a free surface in an inkjet print head. Journal of Fluids Engineering, 127 (1). pp. 98-109. ISSN 0098-2202

2004

Grassia, P. and Neethling, S.J. (2004) Iterative approach to weir drainage. Chemical Engineering Science, 59 (20). pp. 4349-4359. ISSN 0009-2509

Pieruz, G. and Grassia, P. and Dryfe, R.A.W. (2004) Boron removal from produced water by facilitated ion transfer. Desalination, 167. p. 417. ISSN 0011-9164

Shin, Dong-Youn and Grassia, Paul and Derby, Brian (2004) Numerical and experimental comparisons of mass transport rate in a piezoelectric drop-on-demand inkjet print head. International Journal of Mechanical Sciences, 46 (2). pp. 181-199. ISSN 0020-7403

2003

Shin, Dong-Youn and Grassia, Paul and Derby, Brian (2003) Oscillatory limited compressible fluid flow induced by the radial motion of a thick-walled piezoelectric tube. Journal of the Acoustical Society of America, 114 (3). pp. 1314-1321. ISSN 1520-8524

Grassia, P. (2003) Vertex interactions and film shapes in two-dimensional foam. Philosophical Magazine Letters, 83 (6). pp. 403-409. ISSN 1362-3036

2002

Grassia, P. and Richardson, D. (2002) A local nonlinear solution as an approximation to low-frequency spanwise Jitter in thermoconvective flows. Journal of Fluid Mechanics, 469. pp. 343-367. ISSN 0022-1120

Grassia, P. and Neethling, S.J. and Cilliers, J.J. (2002) Foam drainage on a sloping weir. European Physical Journal E, 8 (1 Supp). pp. 517-529. ISSN 1292-8941

2001

Grassia, P. and Cilliers, J.J. and Neethling, S.J. and Ventura-Medina, Esther (2001) Quasi-one-dimensional foam drainage. European Physical Journal E, 6 (4). pp. 325-348. ISSN 1292-8941

Grassia, P S and Cilliers, J J and Neethling, S J (2001) The foam geometry "paradox". Canadian Journal of Physics, 79 (10). pp. 1265-1281. ISSN 0008-4204

Grassia, Paul (2001) Dissipation, fluctuations and conservation laws. American Journal of Physics, 69 (2). pp. 113-119. ISSN 0002-9505

2000

Grassia, P.S. (2000) Delay, feedback and quenching in financial markets. European Physical Journal B - Condensed Matter and Complex Systems, 17 (2). pp. 347-362. ISSN 1434-6028

1999

Grassia, P. (1999) The design of a droplet ejector. Journal of Fluids Engineering, 121 (3). pp. 658-664. ISSN 0098-2202

1998

Grassia, P. and Homsy, G. M. (1998) Buoyant flows with low frequency jitter. Physics of Fluids, 10 (8). 1903. ISSN 1070-6631

Grassia, P. and Homsy, G. M. (1998) Thermocapillary and buoyant flows with low frequency jitter. I. Jitter confined to the plane. Physics of Fluids, 10 (6). pp. 1273-1290. ISSN 1070-6631

Grassia, P. and Homsy, G. M. (1998) Thermocapillary and buoyant flows with low frequency jitter. II. Spanwise jitter. Physics of Fluids, 10 (6). pp. 1291-1314. ISSN 1070-6631

1996

Grassia, P. and Hinch, E. J. (1996) Computer simulations of polymer chain relaxation via Brownian motion. Journal of Fluid Mechanics, 308. pp. 255-288. ISSN 0022-1120

1995

Grassia, P. and Hinch, E. J. and Nitsche, L. C. (1995) Computer simulations of Brownian motion of complex systems. Journal of Fluid Mechanics, 282. pp. 373-403. ISSN 0022-1120