Multiphase treatment of ODTX in HMX spheres
What will be discussed in this report represents a framework upon which multiphase and other real physical effects can be built. Chemical models of increasing complexity are envisioned and this methodology can provide a tool for evaluating new ideas against known experimental data. The recent work to be reported here addresses the multiphase issue of temperature deviation between phases undergoing chemical and heat transport processes. Modeling of the LLNL ODTX experiment will be performed with FLUENT, a commercially available computational fluid dynamics (CFD) code. FLUENT solves flows in 2D or 3D in Cartesian, cylindrical, or general curvilinear coordinates, with steady-state of fully time-dependent analysis. Multiphase flows in which two or more continuous phases are present can be solved with arbitrary volumetric sources of heat, mass, momentum, and chemical species applied through user-defined FORTRAN subroutines. FLUENT models these of phenomena by solving the conservation equations for mass, momentum, energy, phasic volume fraction, and chemical species for each phase using a control volume based finite difference method. The equations are solved using SIMPLE-like algorithms with an iterative line-by-line matrix solver and multigrid acceleration. Before considering the temperature deviation issue and its dependence upon gaseous bubble diameter in a multiphase system, the author discusses the use of FLUENT for modeling the basic constant and uniform density LLNL ODTX problem. Following the discussion of the temperature deviation in the multiphase treatment, the author discusses possible extensions of this work to include more advanced multiphase effects such as surface reactions within bubbles and gas phase transport out of the HE sample.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 674676
- Report Number(s):
- LA-UR-98-1238; ON: DE99000853; TRN: AHC29820%%130
- Resource Relation:
- Other Information: PBD: 22 Dec 1997
- Country of Publication:
- United States
- Language:
- English
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