AFDM: An Advanced Fluid-Dynamics Model
This report gives the Advanced Fluid-Dynamics Model (AFDM) solution algorithm describing vaporization/condensation (V/C) and melting/freezing processes. The finite-difference equations used are derived from the general AFDM differential equations with convection ignored. In two-phase cells, V/C is determined by a simultaneous iterative solution. The objective is to retain stability and energy conservation with consistent interfacial and bulk conditions describing vapor/liquid densities and temperatures. Particular attention is given in the special cases required to obtain a solution. In single-phase cells, the heat transfer is determined first; then, a vapor composition is updated for the {alpha}{sub 0} volume based on the saturation pressures for the individual liquids. Melting/freezing rates are determined based on equilibrium considerations. Mass-transfer-induced velocity changes are calculated implicitly so as to conserve momentum. In addition to the treatment of the standard models, a description is provided on the energy transfers used for the simplified NOPHASE option.
- Research Organization:
- Los Alamos National Lab., NM (USA)
- Sponsoring Organization:
- DOD; NRC
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6849518
- Report Number(s):
- LA-11692-MS-Vol.4; ON: DE90017535
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
A CODES
ALGORITHMS
COMPUTER CODES
ENERGY TRANSFER
EVAPORATION
FINITE DIFFERENCE METHOD
FLOW MODELS
FLUID FLOW
FLUID MECHANICS
FREEZING
HEAT TRANSFER
ITERATIVE METHODS
MASS TRANSFER
MATHEMATICAL LOGIC
MATHEMATICAL MODELS
MECHANICS
MELTING
NUMERICAL SOLUTION
PHASE TRANSFORMATIONS
TWO-PHASE FLOW
VAPOR CONDENSATION