Using NEKTON to solve systems of discrete Boltzmann equations
A discrete-velocity-gas (DVG) model of the Boltzmann equation that employs four velocity states has been implemented numerically by using the computational fluid dynamics code NEKTON to solve the DVG species-transport (discrete Boltzmann) equations. The model is applicable to rarefied two-dimensional isothermal flow and is used to simulate flow through a channel. As expected, the velocity profile is found to be uniform for large Knudsen numbers (free molecular flow) and parabolic for small Knudsen numbers (near continuum flow). Since there are no conceptual differences between the four-state model and models employing more velocity states to better represent the Boltzmann equation, implementation of models with more velocity states appear to be straightforward.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 10167002
- Report Number(s):
- SAND-92-0777C; CONF-9210135-1; ON: DE92018272
- Resource Relation:
- Conference: 1992 Fluent Incorporated software users group meeting,Burlington, VT (United States),13-15 Oct 1992; Other Information: PBD: [1992]
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
FLOW MODELS
BOLTZMANN EQUATION
KNUDSEN FLOW
N CODES
FLUID MECHANICS
VELOCITY
MEAN FREE PATH
GASES
NAVIER-STOKES EQUATIONS
BOUNDARY CONDITIONS
COMPUTERIZED SIMULATION
661300
990200
OTHER ASPECTS OF PHYSICAL SCIENCE
MATHEMATICS AND COMPUTERS