Computational Astrophysics:

1
Computational Astrophysics The Digital Demo
Room One-Dimensional Hydrodynamics Simulator Conl
ey Lee Ditsworth under the care and feeding
of Dr. Charles F. Gammie and close supervision
of graduate student Eric Engelhard
http//rainman.physics.uiuc.edu/ddr/oned/index.htm
l
2
Project Goal
Convert an existing hydrodynamics computer code,
written in C by Dr. Gammie, from a stand-alone
program to an interactive simulator accessible
through internet web browsers
Secondary Goal Enable future professors teaching
graduate-level fluid mechanics a means of
assigning additional homework! sorry
3
The Code

• Original version uses initial conditions file to
  set up medium and type of wave
• A perturbation sets the wave into motion
• Program performs calculations and outputs data to
  files based on time steps
• Code must be recompiled for every change in
  equilibrium conditions or type of wave

4
Steps to Successful Completion

• Re-write C code to accept input data file
• Create web pages to guide user and accept inputs
  (html, cgi script written in Perl)
• Write program(s) to convert output data first to
  images and then movie files
• Make movie files and raw data available through
  the website

5
The Current Situation

• Code re-written to take equilibrium conditions
  from an input data file
• Interactive website designed to gather inputs and
  create an input data file
• Perl script created to run programs
• Hydrodynamics code executes and creates output
  data files

6
Current Status Continued

• SM (Super Mongo) plotting program converts raw
  data to ppm image files
• mpeg encoder program (mpeg2encode) translates
  images into a movie file
• Raw data and movie file archived and made
  available to user through website

Sample Movie
7
Whats Left To Do?

• Plotted ppm image files need work
• How to handle multiple users
• Expand to have separate simulators for beginner,
  intermediate and expert level
• Create a link to all archived files
• Beautify the website
• Write paper!

8
Thats All Folks!
The One-Dimensional Hydrodynamic Simulator Can Be
Found At The Digital Demo Room http//rainman.phy
sics.uiuc.edu/ddr/oned/index.html Conley Lee
Ditsworth Rm 235 LLP lee_at_shout.net or
ditswort_at_uiuc.edu sorry, no office phone
available