# Prof. C.P. Caulfield

## Professor, BP Institute and DAMTP

### Fellow of Churchill College

Dr Colm-cille P. Caulfield is interested in fluid flows where density

variations play a critical dynamical role. He strives to use a combination

of mathematical modelling, numerical simulation and laboratory experimentation

to understand and quantify fundamental physical processes, particularly when

they are transient in nature.

## Biography

- 1992-1994: Post-doctoral research fellow for the Japan-Canada Project in Weather and Climate of the Arctic, Department of Physics, University of Toronto
- 1992-1993: Senior Visitor, Department of Engineering Science, Hokkaido University
- 1995-1999: Lecturer, Department of Mathematics, University of Bristol
- 1999-2001: Assistant Professor of Environmental Engineering, Department of Mechanical and Aerospace Engineering, Irwin and Joan Jacobs School of Engineering, University of California, San Diego
- 2001-2005: Associate Professor (with tenure) of Environmental Engineering, Department of Mechanical and Aerospace Engineering, Irwin and Joan Jacobs School of Engineering, University of California, San Diego
- 2004-2005: Visiting Researcher (Poste Rouge au CNRS) in the Hydrodynamics Laboratory, (LaDyHX) Ecole Polytechnique-CNRS
- 2005-: University Lecturer in Fluid Flow, BP Institute and the Department of Applied Mathematics and Theoretical Physics, University of Cambridge
- 2005-: Fellow and College Lecturer in Mathematics, Churchill College, University of Cambridge

### Qualifications

- 1987 BSc Mathematics, University of Ulster at Coleraine
- 1991 PhD DAMTP, Cambridge

## Research

- stratified flows
- turbulent mixing processes
- flow instability and transition
- turbulent plumes
- building ventilation
- bubble dynamics and interaction with turbulence

## Publications

- Howland, C. J., Taylor, J. R. and Caulfield, C. P. (2018) Testing linear marginal stability in stratified shear layers. JOURNAL OF FLUID MECHANICS 839: FEB 2 2018
- Rao, P., Caulfield, C. P. and Gibbon, J. D. (2017) Nonlinear effects in buoyancy-driven variable-density turbulence. JOURNAL OF FLUID MECHANICS 810: 362-377 JAN 2017
- Sutherland, Bruce R. and Caulfield, C. P. (2017) Optimal perturbation growth in axisymmetric intrusions. JOURNAL OF FLUID MECHANICS 811: JAN 2017
- Deng, Jian, Xue, Jingyu, Mao, Xuerui and Caulfield, C. P. (2017) Coherent structures in interacting vortex rings. PHYSICAL REVIEW FLUIDS 2: FEB 21 2017
- Eaves, T. S. and Caulfield, C. P. (2017) Multiple instability of layered stratified plane Couette flow. JOURNAL OF FLUID MECHANICS 813: 250-278 FEB 2017
- Zhou, Qi, Taylor, John R. and Caulfield, C. P. (2017) Self-similar mixing in stratified plane Couette flow for varying Prandtl number. JOURNAL OF FLUID MECHANICS 820: JUN 2017
- Zhou, Qi, Taylor, J. R., Caulfield, C. P. and Linden, P. F. (2017) Diapycnal mixing in layered stratified plane Couette flow quantified in a tracer-based coordinate. JOURNAL OF FLUID MECHANICS 823: 198-229 JUL 2017
- Mashayek, A., Salehipour, H., Bouffard, D., Caulfield, C. P., Ferrari, R., Nikurashin, M., Peltier, W. R. and Smyth, W. D. (2017) Efficiency of turbulent mixing in the abyssal ocean circulation. GEOPHYSICAL RESEARCH LETTERS 44: 6296-6306 JUN 28 2017
- Kaminski, A. K., Caulfield, C. P. and Taylor, J. R. (2017) Nonlinear evolution of linear optimal perturbations of strongly stratified shear layers. JOURNAL OF FLUID MECHANICS 825: 213-244 AUG 2017
- Mashayek, A., Caulfield, C. P. and Peltier, W. R. (2017) Role of overturns in optimal mixing instratified mixing layers. JOURNAL OF FLUID MECHANICS 826: 522-552 SEP 2017
- Nabi, S., Grover, P. and Caulfield, C. P. (2017) Adjoint-based optimization of displacement ventilation flow. BUILDING AND ENVIRONMENT 124: 342-356 NOV 1 2017
- Lucas, Dan and Caulfield, C. P. (2017) Irreversible mixing by unstable periodic orbits in buoyancy dominated stratified turbulence. JOURNAL OF FLUID MECHANICS 832: OCT 26 2017
- Lucas, Dan, Caulfield, C. P. and Kerswell, Rich R. (2017) Layer formation in horizontally forced stratified turbulence:connecting exact coherent structures to linear instabilities. JOURNAL OF FLUID MECHANICS 832: 409-437 OCT 26 2017
- Dickinson, Alex, White, N. J. and Caulfield, C. P. (2017) Spatial Variation of Diapycnal Diffusivity Estimated From Seismic Imaging of Internal Wave Field, Gulf of Mexico. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 122: 9827-9854 DEC 2017
- Deng, Jian and Caulfield, C. P. (2016) Dependence on aspect ratio of symmetry breaking for oscillating foils: implications for flapping flight. JOURNAL OF FLUID MECHANICS 787: 16-49 JAN 2016
- Falder, Matthew, White, N. J. and Caulfield, C. P. (2016) Seismic Imaging of Rapid Onset of Stratified Turbulence in the South Atlantic Ocean*. JOURNAL OF PHYSICAL OCEANOGRAPHY 46: 1023-1044 APR 2016
- Deng, Jian, Teng, Lubao, Caulfield, C. P. and Mao, Xuerui (2016) Instabilities of interacting vortex rings generated by an oscillating disk. PHYSICAL REVIEW E 94: SEP 14 2016
- Salehipour, Hesam, Caulfield, C. P. and Peltier, W. R. (2016) Turbulent mixing due to the Holmboe wave instability at high Reynolds number. JOURNAL OF FLUID MECHANICS 803: 591-621 SEP 25 2016
- Portwood, G. D., Kops, S. M. de Bruyn, Taylor, J. R., Salehipour, H. and Caulfield, C. P. (2016) Robust identification of dynamically distinct regions in stratified turbulence. JOURNAL OF FLUID MECHANICS 807: NOV 2016
- Taylor, J. R., Deusebio, E., Caulfield, C. P. and Kerswell, R. R. (2016) A new method for isolating turbulent states in transitional stratified plane Couette flow. JOURNAL OF FLUID MECHANICS 808: DEC 2016
- Manucharyan, G. E. and Caulfield, C. P. (2015) Entrainment and mixed layer dynamics of a surface-stress-driven stratified fluid. JOURNAL OF FLUID MECHANICS 765: 653-667 FEB 2015
- Deng, Jian and Caulfield, C. P. (2015) Three-dimensional transition after wake deflection behind a flapping foil. PHYSICAL REVIEW E 91: APR 24 2015
- Lin, Tiras Y., Caulfield, C. P. and Woods, Andrew W. (2015) Buoyancy-induced turbulent mixing in a narrow tilted tank. JOURNAL OF FLUID MECHANICS 773: 267-297 JUN 2015
- Deusebio, Enrico, Caulfield, C. P. and Taylor, J. R. (2015) The intermittency boundary in stratified plane Couette flow. JOURNAL OF FLUID MECHANICS 781: 298-329 OCT 2015
- Eaves, T. S. and Caulfield, C. P. (2015) Disruption of SSP/VWI states by a stable stratification. JOURNAL OF FLUID MECHANICS 784: 548-564 DEC 2015
- Rabin, S. M. E., Caulfield, C. P. and Kerswell, R. R. (2014) Designing a more nonlinearly stable laminar flow via boundary manipulation. JOURNAL OF FLUID MECHANICS 738: JAN 2014
- van Sommeren, Daan D. J. A., Caulfield, C. P. and Woods, Andrew W. (2014) Spatially varying mixing of a passive scalar in a buoyancy-driven turbulent flow. JOURNAL OF FLUID MECHANICS 742: MAR 2014
- Deng, Jian, Caulfield, C. P. and Shao, Xueming (2014) Effect of aspect ratio on the energy extraction efficiency of three-dimensional flapping foils. PHYSICS OF FLUIDS 26: APR 2014
- Sauret, A., Balmforth, N. J., Caulfield, C. P. and McElwaine, J. N. (2014) Bulldozing of granular material. JOURNAL OF FLUID MECHANICS 748: 143-174 JUN 2014
- Foures, D. P. G., Caulfield, C. P. and Schmid, P. J. (2014) Optimal mixing in two-dimensional plane Poiseuille flow at finite Peclet number. JOURNAL OF FLUID MECHANICS 748: 241-277 JUN 2014
- Kaminski, A. K., Caulfield, C. P. and Taylor, J. R. (2014) Transient growth in strongly stratified shear layers. JOURNAL OF FLUID MECHANICS 758: NOV 2014
- Arratia, C, Caulfield, CP and Chomaz, JM (2013) Transient perturbation growth in time-dependent mixing layers. JOURNAL OF FLUID MECHANICS 717: 90-133 FEB 2013
- van Sommeren, DDJA, Caulfield, CP and Woods, AW (2013) Advection and buoyancy-induced turbulent mixing in a narrow vertical tank. JOURNAL OF FLUID MECHANICS 724: 450-479 JUN 2013
- Oglethorpe, RLF, Caulfield, CP and Woods, AW (2013) Spontaneous layering in stratified turbulent Taylor-Couette flow. JOURNAL OF FLUID MECHANICS 721: - APR 2013
- Foures, D. P. G., Caulfield, C. P. and Schmid, P. J. (2013) Localization of flow structures using infinity-norm optimization. JOURNAL OF FLUID MECHANICS 729: 672-701 AUG 2013
- Anjum, Hafiz J., Mcelwaine, Jim N. and Caulfield, Colm-Cille P. (2013) The instantaneous Froude number and depth of unsteady gravity currents. JOURNAL OF HYDRAULIC RESEARCH 51: 432-445 AUG 1 2013
- Mashayek, A., Caulfield, C. P. and Peltier, W. R. (2013) Time-dependent, non-monotonic mixing in stratified turbulent shear flows: implications for oceanographic estimates of buoyancy flux. JOURNAL OF FLUID MECHANICS 736: 570-593 DEC 2013
- Shravat, A, Cenedese, C and Caulfield, CP (2012) Entrainment and mixing dynamics of surface-stress-driven stratified flow in a cylinder. J FLUID MECH 691: 498-517 JAN 25 2012
- Landel, JR, Caulfield, CP and Woods, AW (2012) Meandering due to large eddies and the statistically self-similar dynamics of quasi-two-dimensional jets. J FLUID MECH 692: 347-368 FEB 10 2012
- Balmforth, NJ, Roy, A and Caulfield, CP (2012) Dynamics of vorticity defects in stratified shear flow. J FLUID MECH 694: 292-331 MAR 10 2012
- van Sommeren, DDJA, Caulfield, CP and Woods, AW (2012) Turbulent buoyant convection from a maintained source of buoyancy in a narrow vertical tank. J FLUID MECH 701: 278-303 JUN 25 2012
- Sheen, KL, White, NJ, Caulfield, CP and Hobbs, RW (2012) Seismic imaging of a large horizontal vortex at abyssal depths beneath the Sub-Antarctic Front. NAT GEOSCI 5 (8): 542-546 AUG 2012
- Foures, DPG, Caulfield, CP and Schmid, PJ (2012) Variational framework for flow optimization using seminorm constraints. PHYSICAL REVIEW E AUG 9 2012
- Landel, JR, Caulfield, CP and Woods, AW (2012) Streamwise dispersion and mixing in quasi-two-dimensional steady turbulent jets. JOURNAL OF FLUID MECHANICS 711: 212-258 NOV 25 2012
- Rabin, SME, Caulfield, CP and Kerswell, RR (2012) Triggering turbulence efficiently in plane Couette flow. JOURNAL OF FLUID MECHANICS 712: 244-272 DEC 10 2012
- Coomaraswamy, IA and Caulfield, CP (2011) Time-dependent ventilation flows driven by opposing wind and buoyancy. J FLUID MECH 672: 33-59 APR 2011
- Lombardi, M, Caulfield, CP, Cossu, C, Pesci, AI and Goldstein, RE (2011) Growth and instability of a laminar plume in a strongly stratified environment. J FLUID MECH 671: 184-206 MAR 2011
- Yamamoto, H, Cenedese, C and Caulfield, CP (2011) Laboratory experiments on two coalescing axisymmetric turbulent plumes in a rotating fluid. PHYS FLUIDS 23 (5): - MAY 2011 056601
- Sheen, KL, White, N, Caulfield, CP and Hobbs, RW (2011) Estimating Geostrophic Shear from Seismic Images of Oceanic Structure. J ATMOS OCEAN TECH 28 (9): 1149-1154 SEP 2011
- Dalziel, SB, Patterson, MD, Caulfield, CP and Le Brun, S (2011) The structure of low-Froude-number lee waves over an isolated obstacle. J FLUID MECH 689: 3-31 DEC 2011
- Woods, AW, Caulfield, CP, Landel, JR and Kuesters, A (2010) Non-invasive turbulent mixing across a density interface in a turbulent Taylor-Couette flow. J FLUID MECH 663: 347-357 NOV 2010
- Wells, M, Cenedese, C and Caulfield, CP (2010) The Relationship between Flux Coefficient and Entrainment Ratio in Density Currents. J PHYS OCEANOGR 40 (12): 2713-2727 DEC 2010
- Flynn, MR and Caulfield, CP (2009) Effect of volumetric heat sources on hysteresis phenomena in natural and mixed-mode ventilation. BUILD ENVIRON 44 (1): 216-226 JAN 2009
- Tang, W, Caulfield, CP and Kerswell, RR (2009) A prediction for the optimal stratification for turbulent mixing. J FLUID MECH 634: 487-497 SEP 10 2009
- Scase, MM, Aspden, AJ and Caulfield, CP (2009) The effect of sudden source buoyancy flux increases on turbulent plumes. J FLUID MECH 635: 137-169 SEP 25 2009
- Bower, DJ, Caulfield, CP, Fitzgerald, SD and Woods, AW (2008) Transient ventilation dynamics following a change in strength of a point source of heat. J FLUID MECH 614: 15-37 NOV 10 2008
- Landel, JR, Cossu, C and Caulfield, CP (2008) Spherical cap bubbles with a toroidal bubbly wake. PHYS FLUIDS 20 (12): - DEC 2008 122101
- Dalziel, SB, Patterson, MD, Caulfield, CP and Coomaraswamy, IA (2008) Mixing efficiency in high-aspect-ratio Rayleigh-Taylor experiments. PHYS FLUIDS 20 (6): - JUN 2008 065106
- Scase, MM, Caulfield, CP and Dalziel, SB (2008) Temporal variation of non-ideal plumes with sudden reductions in buoyancy flux. J FLUID MECH 600: 181-199 APR 10 2008
- Bolster, D and Caulfield, CP (2008) Transients in natural ventilation - A time-periodically varying source. BUILD SERV ENG RES T 29 (2): 119-135 2008
- Scase, MM, Caulfield, CP, Linden, PF and Dalziel, SB (2007) Local implications for self-similar turbulent plume models. J FLUID MECH 575: 257-265 MAR 25 2007
- Flynn, MR and Caulfield, CP (2006) Natural ventilation in interconnected chambers. J FLUID MECH 564: 139-158 OCT 10 2006
- Scase, MM, Caulfield, CP, Dalziel, SB and Hunt, JCR (2006) Time-dependent plumes and jets with decreasing source strengths. J FLUID MECH 563: 443-461 SEP 25 2006
- Scase, MM, Caulfield, CP and Dalziel, SB (2006) Boussinesq plumes and jets with decreasing source strengths in stratified environments. J FLUID MECH 563: 463-472 SEP 25 2006
- Patterson, MD, Caulfield, CP, McElwaine, JN and Dalziel, SB (2006) Time-dependent mixing in stratified Kelvin-Helmholtz billows: Experimental observations. GEOPHYS RES LETT 33 (15): - AUG 15 2006 L15608
- Tang, W, Caulfield, CP and Young, WR (2005) Bounds on dissipation in stress-driven flow in a rotating frame. J FLUID MECH 540: 373-391 OCT 10 2005
- Conroy, DT, Smith, SGL and Caulfield, CP (2005) Evolution of a chemically reacting plume in a ventilated room. J FLUID MECH 537: 221-253 AUG 25 2005
- Caulfield, CP (2005) Buoyancy flux bounds for surface-driven flow. J FLUID MECH 536: 367-376 AUG 10 2005
- Caulfield, CP, Tang, W and Plasting, SC (2004) Reynolds number dependence of an upper bound for the long-time-averaged buoyancy flux in plane stratified Couette flow. J FLUID MECH 498: 315-332 JAN 10 2004
- Tang, W, Caulfield, CP and Young, WR (2004) Bounds on dissipation in stress-driven flow. J FLUID MECH 510: 333-352 JUL 10 2004
- Woods, AW, Caulfield, CP and Phillips, JC (2003) Blocked natural ventilation: the effect of a source mass flux. J FLUID MECH 495: 119-133 NOV 25 2003
- Peltier, WR and Caulfield, CP (2003) Mixing efficiency in stratified shear flows. ANNU REV FLUID MECH 35: 135-167 2003
- Caulfield, CP and Woods, AW (2002) The mixing in a room by a localized finite-mass-flux source of buoyancy. J FLUID MECH 471: 33-50 NOV 25 2002
- Lee, V and Caulfield, CP (2001) Nonlinear evolution of a layered stratified shear flow. DYNAM ATMOS OCEANS 34 (2-4): 103-124 OCT 2001
- Caulfield, CP and Kerswell, RR (2001) Maximal mixing rate in turbulent stably stratified Couette flow. PHYS FLUIDS 13 (4): 894-900 APR 2001
- Caulfield, CP and Peltier, WR (2000) The anatomy of the mixing transition in homogeneous and stratified free shear layers. J FLUID MECH 413: 1-47 JUN 25 2000
- Caulfield, CP and Kerswell, RR (2000) The nonlinear development of three-dimensional disturbances at hyperbolic stagnation points: A model of the braid region in mixing layers. PHYS FLUIDS 12 (5): 1032-1043 MAY 2000
- Caulfield, CP and Woods, AW (1998) Turbulent gravitational convection from a point source in a non-uniformly stratified environment. J FLUID MECH 360: 229-248 APR 10 1998
- CAULFIELD, CCP and WOODS, AW (1995) Plumes with non-monotonic mixing behaviour. GEOPHYS ASTRO FLUID 79 (1-4): 173-199 1995
- CAULFIELD, CCP (1994) MULTIPLE LINEAR INSTABILITY OF LAYERED STRATIFIED SHEAR-FLOW. J FLUID MECH 258: 255-285 JAN 10 1994
- WOODS, AW and CAULFIELD, CCP (1992) A LABORATORY STUDY OF EXPLOSIVE VOLCANIC-ERUPTIONS. J GEOPHYS RES-SOL EA 97 (B5): 6699-6712 MAY 10 1992