VH-1 is a multidimensional ideal compressible hydrodynamics code written in FORTRAN, for use on desktop workstations or supercomputers. It was written by the numerical astrophysics group at the University of Virginia in 1990-1991, and is based on the description of the Lagrange-Remap version of the Piece-wise Parabolic Method (PPM) given in Colella and Woodward (J Comp Phys, 54, 174).

VH-1 can be downloaded from http://wonka.physics.ncsu.edu/pub/VH-1

Our parallel version of VH-1 using MPI is extremely simple, but it works very well and maintains the adaptability of VH-1 that has made it so successful. Our approach is to break up the 3D domain into 2D planes, with each plane computed on a different processor. Evolution in the direction across planes is computed locally on individual processors after the data is transposed across processors with a single MPI_ALLTOALL call.

VH-1 has been a key component of undergraduate research projects at NCSU:

• John Wilson: Stream/Wind Interaction in AX Mon
• Jeff Layton: Tidal Mass Transfer in Elliptical-Orbit Binary Stars
• Russell Strickland: Numerical Analysis of the Dynamic Stability of Radiative Shocks
• Mike Malinowski: Hydrodynamic Simulations of the Mass Transfer in Algol
• Brian Marks: Evolution of Cold Shock-Bounded Slabs
• Joel Koewer: Instability of Isothermal Stellar Wind Bowshocks
• Rosemary Stallings: Hydrodynamic Convection in Core-Collapse Supernovae
• Drew Norman: 3D Simulations of the NTSI
• Grant Palmquist: QPO's and the Last Stable Orbit Around Black Holes
• Chris Hinkle: Asymmetric Supernovae and the Radio Light Curve of SN 1987A
• Mike Raley: Gravitational Wave Signature of Core-Collapse Supernovae
• Rukshan Jayatilak: 3D Simulations of Bondi-Hoyle Accretion
• Dargan Frierson: Hydrodynamic Interaction of a SNR with a Pulsar Bubble
• Nick Stoute: X-Ray Irradiated Winds from the Inner Edge of an Accretion Disk
• Christina Hammock: Adding Passive Magnetic Fields to VH-1
• Brett Unks: 3D Simulations of Unsteady Radiative Shocks
• John Stanley: Expansion of Axisymmetric Supernovae
• Vladimir Rekovic: Supernova Remnant Evolution in a Circumstellar Bubble
• Jason Puryear: Interaction of an Extragalactic Jet with the Galactic Disk
• Michael DeMasi: Expansion of a Supernova Remnant Through a Cloudy Medium
• Scott Starin: Hydrodynamic Modeling of SNR Cassiopeia A