With John Everett and Jonathan Braithwaite, I've created and lead the weekly Astrophysical Fluids Seminar at the University of Toronto, which includes people from the Astronomy and Physics departments as well as CITA.

I also run `online journal clubs' for Astrophysical Fluids and Computational Astrophysics.

I recently organized and led a FLASH workshop at CITA.

Here is a selection of talks I've given recently.

• Sweeping up a Magnetic Sheath: Magnetic Draping over Moving Cores and Bubbles in Galaxy Clusters
  Accretion and Explosion: the Astrophysics of Degenerate Stars, KITP, May 17 2007
  [PDF] [Keynote]
  A talk given while I was in residence at the KITP program on supernovae in May 2007. The talk is on work examining `magnetic draping' in galaxy clusters. Video or audio of the talk, as well as the slides, are available at the KITP website.
• First Flames: Burning, Turbulence, and Buoyancy
  Paths to Exploding Stars: Accretion and Eruption, KITP, Mar 2007
  [PDF] [Keynote]
  An invited talk to the KITP conference during the program Accretion and Explosion: the Astrophysics of Degenerate Stars at KITP. The talk discusses the ignition and earliest burning phases in a Type Ia supernovae. (Choppy) video or audio of the talk, as well as the slides, is available at the conference webpage.
• Simulating Astrophysical Combustion with the FLASH code
  CAIMS/MITACS Joint Annual Conference, June 2006
  [PDF] [OpenDocument]
  An invited talk to the Scientific Computing session of the annual Canadian applied mathematics conference discussing simulating combustion in an astrophysical context, and the computational choices that this regime suggests.
• Local Ignition in Carbon-Oxygen White Dwarfs: One Zone Ignition, and Spherical Shock Ignition of Detonations
  208^th AAS meeting, June 2006
  [PDF] [OpenDocument]
  A presentation describing recent work on the physics of local ignition in Type Ia supernovae.
• Towards Understanding some Astrophysical Flows using Multiscale Approaches with the FLASH code
  HPCS 2006, May 2006
  [PDF] [OpenDocument]
  A discussion of some of our attempts to simulate turbulent astrophysical flows with interesting physics on disparate scales using simple multiscale approaches.
• Lagrangian Methods and SPH
  Stony Brook University, Apr 2006
  [PDF]
  An introductory lecture to a class on grid methods for hydrodynamics on SPH methods.
• Grungy Gastrophysics and Cosmology
  St. Mary's University, Nov 2005
  [PDF] [OpenDocument]
  This discusses the Type Ia supernovae problem, the very detailed interplay of physics needed to really understand how they blow up, and arguing that the problem is really still very much wide-open.
• Hydrodynamics in the FLASH code
  CITA FLASH workshop, March 2005
  [PDF]
  A partial overview of astrophysical CFD generally, and a discussion of the hydrodynamical methods implemented in the FLASH code in particular.
• Buoyancy and Astrophysics
  Toronto Astrophysical Gas Dynamics Seminar, Oct 2004
  [PDF] [OpenOffice .sxi]
  Rayleigh-Taylor, RT-plus burning, and rising bubbles; an overview of some astrophysical problems involving buoyancy and why such simple problems are so surprisingly difficult to deal with.
• Response of Astrophysical Thermonuclear Flames to Curvature and Stretch
  SIAM Conference on Numerical Combustion, May 2004
  [PDF] [OpenOffice .sxi]
  A presentation to a combustion audience about this work.
• Really, Really Hot Flames, and How, In My Small Way, I Helped Save The Universe
  Wopat Student Talks, University of Chicago, Feb 2004
  [PDF]
  A (much!) less formal presentation of the same material above, for the world famous Wopat talks. Probably the only talk I've ever given with musical accompaniment.
• Using Numerical Simulations to explore a Mixing Mechanisms for Nova Enrichment
  Krell/DOE CSGF Conference, July 2002
  [PDF] [PPT]
  A presentation to a general computational science audience about our work on classical novae.
• High Performance Reactive Fluid Flow Simulations Using Adaptive Mesh Refinement on Thousands of Processors
  Supercomputing 2000, Nov 2000
  [PDF]
  This was the talk I gave (on behalf of the whole FLASH team) for the Gordon Bell Award.