HYDRO PAGE
Hydrodynamic Computation of Flow around Solid Object
Authors: R. Bedogni1 , A. Di Fazio 2
1--> Osservatorio Astronomico di Bologna,
Via Ranzani 1, I-40127, Bologna, Italy
2--> Osservatorio Astronomico di Roma
Viale del Parco Mellini 84, I-00136 Roma, Italy
Introduction (only text)
Hydro Equations
Initial and Boundary Conditions (only text)
Numerical Method
The Piecewise Parabolic Method (PPM) developed by Colella
and Woodward (1984) is one of most powerful tools to simulate the
unsteady flows containing strong shocks in astrophysics, such as
supernova explosions (Bedogni and Woodward (1990)).
Details of the characteristics and the performance
of PPM in comparison with Godunov's , Mc Cormack's and FCT's methods are
presented and widely discussed by Woodward and Colella (1984).
Here we solve the Euler equations describing the conservation of mass,
momentum, and energy for an inviscid gas may be written as:
The pressure is related to the density and internal energy
by the gamma-law equation of state.
The ratio of the specific heats is gamma =5/3 for a monoatomic gas,
and we choose gamma=7/5 for air (the approximation is of course
explained by the predominance of biatomic molecules in air).
Numerical Viscosity and Reynolds Number (only text)
Flow around a SPHERE (text and images)
Flow around a CYLINDER (text and images)
References