User:Tohline/Appendix/Ramblings/MyDoctoralStudents

Chronology of Research Endeavors

Doctoral Students Tohline Has Advised

Doctoral Students Whom Tohline has Advised at LSU
Year of Ph.D.	Student Name	ED†	Jointly Advised?
1988	Harold Williams
1989	Dimitris M. Christodoulou
1992	John Woodward
1994	Horst Väth		w/ Detlev Koester (Univ. of Kiel, Germany)
1996	Kimberly C. (Barker) New
1998	Paul Fisher
1998	Saied Andalib
1998	Erik Young		w/ Ganesh Chanmugam (LSU Physics & Astronomy)
1999	John E. Cazes
1999	Howard S. Cohl
2001	Eric I. Barnes
2001	Patrick M. Motl	<math>~\odot</math>	w/ Juhan Frank (LSU Physics & Astronomy)
2004	Shangli Ou	<math>~\odot</math>
2006	Ravi Kumar Kopparapu	<math>~\odot</math>
2006	Richard P. Muffoletto	<math>~\odot</math>	w/ John Tyler (LSU Computer Science)
2010	Wes P. Even	<math>~\odot</math>
2010	Jay M. Call	<math>~\odot</math>
2011	Dominic C. Marcello	<math>~\odot</math>
2014	Zachary D. Byerly	<math>~\odot</math>
†ED = Electronic Dissertation Annotated NOTE: In order to see a larger version of the primary image — or its annotated thumbnail companion, shown here, on the right — click once on the image, then click a second time on Full Resolution.

Outline of Research Activities

Years (approx.)	Comments	Significant Research Contributions‡				Discussion
		A	CH	V	O
1976 - 1978	Tohline's dissertation research under the guidance of Peter Bodenheimer (UCSC) and David Black (NASA/Ames) was an early attempt to examine whether of not isothermal gas clouds whose mass exceeds the Jeans mass spontaneously fragment during a phase of free-fall collapse. The adopted Eulerian computational hydrodynamics scheme was first-order donor-cell based on the 2D (axisymmetric, cylindrical-coordinate) scheme described by Black & Bodenheimer (1976) but extended by Tohline to a 3D grid; a typical simulation was carried out on the CDC7600 at NASA/Ames and involved <math>~30^3 \approx 3 \times 10^4</math> grid cells. The self-consistently determined, time-dependent Newtonian gravitational potential was determined by combining (1) an FFT technique in the azimuthal coordinate direction, with (2) a Buneman Cyclic Reduction technique in R and Z. Richard Durisen — a NASA/Ames postdoc at the time — said to me something along the lines of, "Hey! When you finish developing that hydrocode, let's get together and examine the dynamical stability of rapidly rotating, equilibrium configurations."	sf	♦	--	--	TBD
1978 - 1982	While at Yale University (1978 - 1980) and at Los Alamos National Laboratory (1980 - 1982), Tohline worked closely with Richard Durisen (Indiana University) to examine the onset and nonlinear development of nonaxisymmetric instabilities in differentially rotating, n = 3/2 polytropes whose internal angular momentum distribution was that of an n' = 0 sequence. Generally speaking, unstable eigenfrequencies matched earlier predictions (by other groups) based on linear stability analyses; unstable eigenfunctions displayed a two-armed spiral character. As the amplitude of unstable modes grew to nonlinear amplitude, the developed spiral arms were able to effectively redistribution angular momentum, preventing fragmentation/fission of the configurations. Nelson Caldwell — a Yale graduate student at the time — showed Tohline some of his early work focused on the observationally determined properties of elliptical galaxies that display prominent dust lanes. Additional discussions led to a collaboration between Caldwell, Tohline, and Gregory Simonson — also a Yale graduate student at the time — in which the observed orientation of dust lanes can be explained in terms of dissipative settling of gas disks and, as a consequence, can be used to deduce the underlying geometry (e.g., oblate or prolate spheroidal) of each galaxy's mass distribution. With guidance from Tohline, Simonson completed a Yale University doctoral dissertation in which this settling model was extended to the context of polar rings in spiral galaxies.	sf, gd	--	--	--	TBD
‡Research areas in which significant contributions were made: Astrophysics (A), Computational Hydrodynamics (CH), Visualization (V), and Other (O). Subcategories under Astrophysics are sf (star formation), gd (galaxy dynamics), GR (sources of gravitational radiation).

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