Center for Nonlinear and Complex Systems at Duke University

CNCS

Center for Nonlinear and Complex Systems

Laurens E. Howle, Associate Professor of Mechanical Engineering and Materials Science and CNCS: Center for nonlinear and complex systems and Associate Professor in the Division of Marine Science and Conservation and Associate Professor of Radiology and Faculty Network Member of The Energy Initiative

Professor Howle's research interests span the disciplines of thermal science, fluid dynamics, and nonlinear dynamics. His present research projects - visualization of convective fluid patterns, stabilization of the no-motion state in free convection and bifurcation in imperfect or distributed parameter systems - are split evenly between experimental and computational methods.

A key problem facing researchers studying convection in fluid-saturated porous media is the lack of a general, non-invasive method for pattern visualization and wave number measurement. Professor Howle designed innovative porous media which allow optical techniques to be used for the first time as a pattern visualization tool in the study of porous media convection.

Computational spectral methods are efficient methods of simulation of small aspect ratio convection systems. For large problems, these methods can become too expensive to be practical. Professor Howle developed a reduced Galerkin method which decreases the execution time by orders of magnitude for large problems. This extends the range of problems for which certain spectral methods may be used. He is currently studying porous free convection in systems with distributed properties and binary convection using the reduced Galerkin method.

Contact Info:

Office Location:	239 Hudson Eng Bldg, Box 90300, Durham, NC 27708-0300
Office Phone:	(919) 660-5331
Email Address:
Web Page:	http://www.math.duke.edu/cncs/~leh

Teaching (Fall 2021):

ME 490.07, SPECIAL TOPICS Synopsis
Hudson 232, TuTh 01:45 PM-03:00 PM
(also cross-listed as ENRGYEGR 490.07)
ME 555.07, ADVANCED TOPICS Synopsis
Hudson 232, TuTh 01:45 PM-03:00 PM

Education:

Ph.D.	Duke University	1993
MS	Duke University	1991
BSE	Duke University	1989

Specialties:: Chaos, Dynamics
Nonlinear Dynamics
Thermodynamics
Fluid Mechanics
Nonlinear Systems
Manufacturing

Research Interests:: Thermal science, fluid dynamics, and nonlinear dynamics

Keywords:: Algorithms • Analysis of Variance • Angiography • Animals • Anura • Aorta • Aortic Aneurysm • Aortography • Biomimetic Materials • Blood Flow Velocity • Bottlenose dolphin • Cardiac Output • Catheterization, Central Venous • Catheterization, Peripheral • Catheters, Indwelling • Cetacea • Chelating Agents • Computational fluid dynamics • Computer Simulation • Computer-Aided Design • Contrast Media • Coronary Angiography • Data Interpretation, Statistical • Decompression Sickness • Diving • Dose-Response Relationship, Drug • Drug Administration Schedule • Equipment Design • Equipment Failure • Equipment Failure Analysis • Equipment Safety • Evaluation Studies as Topic • Extremities • Gadolinium • Humans • Hydrodynamics • Incidence • Injections, Intra-Arterial • Injections, Intravenous • Iodine • Iopamidol • Kaplan-Meier Estimate • Likelihood Functions • Linear Models • Magnetic Resonance Angiography • Microfluidics • Models, Biological • Models, Cardiovascular • Models, Statistical • Multidetector Computed Tomography • Particle Size • Phantoms, Imaging • Phosphatidylcholines • Pilot Projects • Predictive Value of Tests • Pressure • Proportional Hazards Models • Radiographic Image Enhancement • Radiographic Image Interpretation, Computer-Assisted • Recovery of Function • Regional Blood Flow • Reproducibility of Results • Retinal Cone Photoreceptor Cells • Retinal Photoreceptor Cell Outer Segment • Retinal Pigments • Reynolds number • Rheology • Risk Assessment • Risk Factors • Rupture • Sensitivity and Specificity • Severity of Illness Index • Sodium Chloride • Solutions • Statistics, Nonparametric • Swimming • Telemetry • Time Factors • Tomography, X-Ray Computed • Ultrasonics • Viscosity

Recent Publications (More Publications)

Wu, CY; Nowacek, DP; Nousek-McGregor, AE; McGregor, R; Howle, LE, Computational fluid dynamics of flow regime and hydrodynamic forces generated by a gliding North Atlantic right whale (Eubalaena glacialis), Marine Mammal Science, vol. 37 no. 3 (July, 2021), pp. 826-842 [doi] [abs]
Schwartz, FR; Lewis, DS; King, AE; Murphy, FG; Howle, LE; Kim, CY; Nelson, RC, Hemodialysis catheter integrity during mechanical power injection of iodinated contrast medium for computed tomography angiography., Abdom Radiol (Ny), vol. 46 no. 6 (June, 2021), pp. 2961-2967 [doi] [abs]
Dunford, RG; Denoble, PD; Forbes, R; Pieper, CF; Howle, LE; Vann, RD, A study of decompression sickness using recorded depth-time profiles., Undersea & Hyperbaric Medicine : Journal of the Undersea and Hyperbaric Medical Society, Inc, vol. 47 no. 1 (January, 2020), pp. 75-91 [abs]
King, AE; Howle, LE, Tetranomial decompression sickness model using serious, mild, marginal, and non-event outcomes, Informatics in Medicine Unlocked, vol. 20 (January, 2020) [doi] [abs]
Di Muro, G; Murphy, FG; Vann, RD; Howle, LE, Are interconnected compartmental models more effective at predicting decompression sickness risk?, Informatics in Medicine Unlocked, vol. 20 (January, 2020) [doi] [abs]