Faculty Directory
Richard M. Lueptow

Professor of Mechanical Engineering

Co-Director of Master of Product Development Program

Senior Associate Dean for Research


2145 Sheridan Road
Tech L258
Evanston, IL 60208-3109

(847) 491-2739Email Richard Lueptow


Richard M. Lueptow's Research Group


Master of Product Development Program


Mechanical Engineering

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Sc.D. Mechanical Engineering, MIT, Cambridge, MA

S.M. Mechanical Engineering, MIT, Cambridge, MA

B.S. Engineering, Michigan Technological University, Houghton, MI

Research Interests

Richard Lueptow's current research interests are in three areas: 1) Modeling and simulation of the segregation and mixing of polydisperse and non-spherical flowing granular materials in quasi-2D and fully 3D geometries; 2) A dynamical systems approach to mixing by "cutting and shuffling," particularly as applied to granular materials; 3) Molecular level simulation of transport processes in polymeric reverse osmosis membranes.

Significant Recognition

  • Northwestern University McCormick School of Engineering and Applied Science Teacher of the Year Award (2 times)
  • Society of Automotive Engineers Teetor Educational Award
  • American Society for Engineering Education Dow Outstanding Young Faculty Award
  • William M. Carey Award, National Fire Protection Research Foundation (2 times)
  • Space Act Award from the NASA Inventions and Contributions Board
  • Fellow of the American Physical Society, Division of Fluid Dynamics, 2008
  • Fellow of the American Society of Mechanical Engineers

Selected Publications

  • Schlick, Conor P.; Umbanhowar, Paul B; Ottino, Julio M.; Lueptow, Richard M., “Competitive autocatalytic reactions in chaotic flows with diffusion: Prediction using finite-time Lyapunov exponents”, Chaos, (2014)
  • Lueptow, Richard M.; Tilton, Nils; Serre, Eric; Martinand, Denis, “A 3D pseudospectral algorithm for fluid flows with permeable walls: Application to filtration”, Computers and Fluids, (2014)
  • Fan, Yi; Schlick, Conor P.; Umbanhowar, Paul B.; Ottino, Julio M.; Lueptow, Richard M., “Modelling size segregation of granular materials: the roles of segregation, advection and diffusion”, Journal of Fluid Mechanics, (2014)
  • Christov, Ivan C; Lueptow, Richard M.; Ottino, Julio M.; Sturman, Rob, “A Study in Three-Dimensional Chaotic Dynamics: Granular Flow and Transport in a Bi-Axial Spherical Tumbler”, SIAM Journal on Applied Dynamical Systems, (2014)
  • Ottino, Julio M.; Umbanhowar, Paul B.; Lueptow, Richard M.; Fan, Yi, “Kinematics of monodisperse and bidisperse granular flows in quasi-two-dimensional bounded heaps”, Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, (2013)
  • Umbanhowar, Paul B.; Ottino, Julio M.; Lueptow, Richard M., “Modeling granular materials: A test bed for framing and analysis”, AIChE Journal, (2013)
  • Schlick, Conor P.; Christov, Ivan C.; Umbanhowar, Paul B.; Ottino, Julio M.; Lueptow, Richard M., “A mapping method for distributive mixing with diffusion: Interplay between chaos and diffusion in time-periodic sine flow”, Physics of Fluids, (2013)
  • Christov, Ivan C.; Ottino, Julio M.; Lueptow, Richard M.; Krotter, Marissa K., “Cutting and shuffling a line segment: Mixing by interval exchange transformations”, International Journal of Bifurcation and Chaos, (2012)
  • Umbanhowar, Paul B.; Ottino, Julio M.; Lueptow, Richard M.; Fan, Yi; Boukerkour, Youcef, “Stratification, segregation, and mixing of granular materials in quasi-two-dimensional bounded heaps”, Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, (2012)
  • N. Tilton, D. Martinand, E. Serre and R. M. Lueptow, “Incorporating Darcy's law for pure solvent flow through porous tubes: Asymptotic solution and numerical simulations”, Aiche Journal, (2012)
  • G. Juarez, I. C. Christov, J. M. Ottino and R. M. Lueptow, “Mixing by cutting and shuffling 3D granular flow in spherical tumblers”, Chemical Engineering Science, (2012)
  • A. Petculescu and R. M. Lueptow, “Quantitative Acoustic Relaxational Spectroscopy for real-time monitoring of natural gas: A perspective on its potential”, Sensors and Actuators B-Chemical, (2012)
  • I. C. Christov, J. M. Ottino and R. M. Lueptow, “From streamline jumping to strange eigenmodes: Bridging the Lagrangian and Eulerian pictures of the kinematics of mixing in granular flows”, Physics of Fluids, (2011)
  • IC Christov;RM Lueptow;JM Ottino, “Stretching and folding versus cutting and shuffling: An illustrated perspective on mixing and deformations of continua”, American Journal of Physics, (2011)
  • Pengfei Chen;Julio M. Ottino;Richard M. Lueptow, “Granular axial band formation in rotating tumblers: a discrete element method study”, New Journal of Physics, (2011)
  • Gabriel Juarez;Pengfei Chen;Richard M. Lueptow, “Transition to centrifuging granular flow in rotating tumblers: a modified Froude number”, New Journal of Physics, (2011)
  • N Tilton;D Martinand;E Serre;RM Lueptow, “Pressure-driven radial flow in a Taylor-Couette cell”, Journal of Fluid Mechanics, (2010)
  • IC Christov, JM Ottino, RM Lueptow, “Chaotic mixing via streamline jumping in quasi-two-dimensional tumbled granular flows”, Chaos: An Interdisciplinary ..., (2010)
  • G Juarez, RM Lueptow, JM Ottino, R ..., “Mixing by cutting and shuffling”, EPL (Europhysics ..., (2010)
  • GABRIEL JUAREZ;RICHARD M LUEPTOW;JULIO M OTTINO, “Granular coarsening: phase space and evolution analogies.”, Phys Rev E Stat Nonlin Soft Matter Phys, (2010)
  • IVAN C CHRISTOV;JULIO M OTTINO;RICHARD M LUEPTOW, “Streamline jumping: a mixing mechanism.”, Phys Rev E Stat Nonlin Soft Matter Phys, (2010)
  • PENGFEI CHEN;JULIO M OTTINO;RICHARD M LUEPTOW, “Onset mechanism for granular axial band formation in rotating tumblers.”, Phys Rev Lett, (2010)
  • NICHOLAS A POHLMAN;JULIO M OTTINO;RICHARD M LUEPTOW, “Unsteady granular flows in a rotating tumbler.”, Phys Rev E Stat Nonlin Soft Matter Phys, (2009)
  • D MARTINAND;E SERRE;RM LUEPTOW, “Absolute and convective instability of cylindrical Couette flow with axial and radial flows”, Physics of Fluids, (2009)
  • PF CHEN, BJ LOCHMAN, JM OTTINO, et al., “Inversion of Band Patterns in Spherical Tumblers”, PHYSICAL REVIEW LETTERS, (2009)