Faculty Directory
Richard M. Lueptow

Professor of Mechanical Engineering (and by Courtesy) Chemical and Biological Engineering

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


Mechanical Engineering


Master of Science in Product Design and Development Management Program

Theoretical and Applied Mechanics Graduate Program


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, simulation, and experiments on the segregation and mixing of bi-and poly-disperse granular materials, both spherical and non-spherical, 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 nanofiltration and 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

Significant Professional Service

  • Charles Deering McCormick Professor of Teaching Excellence

Selected Publications

  • Ottino, Julio M.; Lueptow, Richard M.; Umbanhowar, Paul B.; Fan, Yi; Schlick, Conor P., “Granular segregation in circular tumblers: Theoretical model and scaling laws”, Journal of Fluid Mechanics, (2015)
  • Lueptow, Richard M.; Martinand, Denis; Serre, Eric, “Mechanisms for the transition to waviness for Taylor vortices”, Physics of Fluids, (2014)
  • 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)