*
Cococubed.com


Chapman-Jouget Detonations

Home

Astronomy research
Software instruments
   Stellar equation of states
   EOS with ionization
   EOS for supernovae
   Chemical potentials
   Stellar atmospheres
   Voigt Function
   Jeans escape
   Polytropic stars
   Cold white dwarfs
   Hotter white dwarfs
   Cold neutron stars
   Stellar opacities
   Neutrino energy loss rates
   Ephemeris routines
   Fermi-Dirac functions
   Galactic chemical evolution

   Nuclear reaction networks
   Nuclear statistical equilibrium
   Laminar deflagrations
   CJ detonations
   ZND detonations
   Fitting to conic sections
   Unusual linear algebra
   Derivatives on uneven grids
   Pentadiagonal solver
   Quadratics, Cubics, Quartics
   Supernova light curves
   Exact Riemann solutions
   1D PPM Hydrodynamics
   Verification problems
   Plane - Cube Intersection

   MESA
   MESA-Web
   FLASH

   Zingale's software
   Brown's dStar
   GR1D code
   Iliadis' STARLIB database
   Herwig's NuGRID
   Meyer's NetNuc
Presentations
Illustrations
Videos
Bicycle adventures

AAS Journals
2017 MESA Marketplace
2017 MESA Summer School
2017 ASU+EdX AST111x
Teaching materials
Education and Public Outreach


Contact: F.X.Timmes
my one page vitae,
full vitae,
research statement, and
teaching statement.

Given
• the thermodynamics of the fuel (the fuel's temperature, density and composition)
• the ashes exist in their equilibrium state (NSE in the nuclear case)
then the Chapman-Jouget (1890) detonation solution follows from conservation of momentum, energy, mass, and charge across the flame front. This gives four nonlinear, algebraic conditions whose simultaneous solution is desired. That is, a four dimensional root find is done.

The CJ solution tells you the
• speed of the detonation
• thermodynamics of the ashes

The CJ solution doesn't tell you the
• width of the fuel-to-ash region
• spatial variations of the variables
• if the solution is a self-sustaining detonation

The instrument in public_cjdet.tbz generates CJ detonation solutions and will also compute the strong and weak detonation solutions in the event that one chooses to drive the detonation at a user-specified Mach number. If you want what the Chapman-Jouget solution doesn't tell you, a ZND detonation probably will.


image
detonation speed
image
why speed is non-monotonic
image
detonation regimes


 



Please cite the relevant references if you publish a piece of work that use these codes, pieces of these codes, or modified versions of them. Offer co-authorship as appropriate.