Computer codes HYDRO

The computational code used in solving the hydrodynamic equation is developed based on the CFDLIB, a finite-volume hydro-code using a common data structure and a common numerical method (Kashiwa et al., 1994). An explicit time-marching, cell-centered Implicit Continuous-fluid Eulerian (ICE) numerical technique is employed to solve the governing equations (Amsden and Harlow, 1968). The computation cycle is split to two distinct phases a Lagrangian phase and a remapping phase, in which the Arbitrary Lagrangian Eulerian (ALE) technique is applied to support the arbitrary mesh motion with fluid flow. 

DE - A Two-Dimensional Eulerian Hydro-dynamic Code for Computing One-Component Reactive Hydrodynamic Problems , Los Alamos Scientific Laboratory Report LA-3629-MS (1966) 23b) C.L. Mader, "FORTRAN-SIN - A One-Dimensional Hydrodynamic Code for Problems Which Include Chemical Reactions, Elastic-Plastic Flow, Spalling, and Phase Transitions , Los Alamos Scientific Laboratory Report LA-3720(1967) 24) R.C. Sprowls, "Com-... 

Recently various computational hydro codes have been adapted to the determination of underwater shock parameters. A Lagrangian code (with artificial viscosity) augmented by a sharp shock routine was used by Sternberg Hurwitz (Ref 12) to generate the curves shown in Figs 22,23 24... 

The main reason why numerical waves have not been discussed much in the CFD community is that most RANS codes use excessive artificial viscosity and large turbulent viscosity levels (due to turbulence models) which kills all numerical waves. They also kill all acoustic waves and all hydro-dynamic modes and cannot be used for the present needs of combustion research. Methods which can compute accurately waves in reacting flows must use centered schemes and LES (or DNS) formulations in order to avoid damping all waves (physical and numerical). A convenient way to illustrate this point is to compare the various viscosities pla3ung a role in a CFD code ... 

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