Abstract:
The mixed continuum-discrete physical framework combines an Eulerian continuum description with a discrete framework that follows the Lagrangian motion of individual particles. In certain multi-phase flows, for example, the continuum phase is described by the flow mechanics of a carrier fluid, whereas the motion of liquid droplets or solid particles governs the discrete phase. Plasma dynamics is another example that can be described like this, i.e. the electromagnetic continuum is described by Maxwell's equations, and electrons and ions represent discrete particles.
This talk is divided into two parts. In the first part, I will briefly present the low-dispersive, flexible, high-order multi-domain numerical methods that are used to simulate various complex, mixed continuum-discrete physical systems. I will discuss coupling of discrete particle methods to high-order continuum discretizations, boundary condition treatments, particle tracking, and temporal integration.
In the second part, I will present the results of simulations of compressible, turbulent, particle-laden flow in a dump combustor. I will discuss compressibility effects, particle dispersion and passive control of the flow. I will also discuss simulations of unsteady, three dimensional separating flows that are frequently encountered in engineering applications. The separation locations and surfaces are identified with the aid of a new kinematic separation theory. Finally, I will present simulations of the plasma dynamics in high-power microwave devices, and the earth's magneto tail.
Biographical sketch:
Professor Jacobs received an M.Sc. in Aerospace Engineering from the Delft University of Technology in September 1998, where after graduation, he was appointed to Added Researcher. He was a Technical Analyst from March to July 1999 at DAF Trucks in Eindhoven, The Nethelands. He received a Ph.D. in Mechanical Engineering from the University of Illinois at Chicago. Following graduation in August of 2003, he was appointed Visiting Assistant Professor in the Division of Applied Mathematics at Brown University. In October he combined this position with a Postdoctoral Fellowship at the Department of Mechanical Engineering at the Massachusetts Institute of Technology. As of August 2006 he was appointed Assistant Professor of Aerospace Engineering at San Diego State University.
He graduated with an Honor Propaedeuse from Delft University of Technology. In 2001 he received the Provost's Award for Graduate Research at the University of Illinois at Chicago. In 2002 he was awarded a University Fellowship at the University of Illinois. In 2006 his biography was published in Who's Who in Science and Engineering.
Professor Jacobs has been a member of American Institute of Aeronautics and Astronautics since 2001, and of the American Physical Society since 2005. He serves as a reviewer for numerous journals, and has organized and chaired sessions at International Conferences.
The research interests of Professor Jacobs can broadly be defined in area of computational multiphase, and multiscale flow physics using high-order methods. Particular emphasis is on simulation and analysis of particle-laden and two-phase flows in complex geometries, and plasmas to aid flow control relating to combustion optimization and drag reduction, identification of three-dimensional (3D) unsteady flow separation in complex geometries, and design of high-power microwave devices. Numerical research has focused on the coupling of low dispersive, flexible high-order continuum discretization strategies to discrete particle methods.
Professor Jacobs main contributions are
· identification of flow separation and verification of theoretical criteria in laminar three-dimensional compressible flows in complex geometries.
· computation and analysis of particle-laden and two-phase reacting flows.
· the development of effective high-order numerical algorithms for simulation of two-phase turbulent flows.
· the development of the first high-order particle-in-cell method for simulations of high-energy plasmas.