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Publications in VIVO

Julien, Keith Professor


Research Areas research areas


research overview

  • Dr. Julien's primary area of research is focussed in the mathematical geo- and astro-physical sciences. Specifically, the modeling of dynamical processes and instabilities occurring in geophysical and astrophysical flows. Examples include protoplanetary disks, stably and unstably stratified flows (such as penetrative convection, rotating and magneto- convection), shear flows and boundary effects in turbulent convection. Particular emphasis is placed on the identification of reduced PDE models that accurately describe coherent structures, the transport and organization of large-scale flows, mean flow generation, and wave propagation. Complimentary to these interest is the development of fast numerical algorithms for the purpose of numerical simulations on state of the art high performance computing architectures. Dr Julien's also experienced in the areas of dynamical systems and physical applied mathematics.


  • Geophysical and Astrophysical Fluid Dynamics, Fluid Dynamics, Physical Applied Mathematics, Nonlinear Dynamics, Computational Fluid Dynamics, Hydrodynamics, Asymptotics, Dynamical Systems


selected publications


courses taught

  • APPM 2360 - Introduction to Differential Equations with Linear Algebra
    Primary Instructor - Fall 2019
    Introduces ordinary differential equations, systems of linear equations, matrices, determinants, vector spaces, linear transformations, and systems of linear differential equations. Credit not granted for this course and both MATH 2130 and MATH 3430.
  • APPM 5480 - Methods of Applied Mathematics: Approximation Methods
    Primary Instructor - Spring 2019
    Covers asymptotic evaluation of integrals (stationary phase and steepest descent), perturbation methods (regular and singular methods, and inner and outer expansions), multiple scale methods and applications to differential and integral equations. Department enforced prerequisite: APPM 5470.
  • APPM 6950 - Master's Thesis
    Primary Instructor - Spring 2020
    May be repeated up to 6 total credit hours.
  • APPM 7400 - Topics in Applied Mathematics
    Primary Instructor - Fall 2018 / Spring 2019 / Fall 2019 / Spring 2020
    Provides a vehicle for the development and presentation of new topics with the potential of being incorporated into the core courses in applied mathematics. May be repeated up to 6 total credit hours.


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