A Unified Multidimensional Hybrid Gaskinetic BGK method using Cartesian Grid for Nonequilibrium and Chemically Reacting Flows

Award Information
Agency:
Department of Defense
Branch
Air Force
Amount:
$99,887.00
Award Year:
2009
Program:
STTR
Phase:
Phase I
Contract:
FA9550-09-C-0093
Award Id:
90146
Agency Tracking Number:
F08A-019-0025
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
9489 E. Ironwood Square Drive, Scottsdale, AZ, 85258
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
182103291
Principal Investigator:
ChunpeiCai
Principal Investigator
(480) 945-9988
chunpei@zonatech.com
Business Contact:
JenniferScherr
Project Manager
(480) 945-9988
jennifer@zonatech.com
Research Institute:
University of California, Irvine
Cynthia J Wells
300 University Tower
Irivine, CA, 92612
(949) 824-9015
Nonprofit college or university
Abstract
A consistent time-accurate Hybrid gaskinetic Bhatnagar-Gross-Krook (BGK) method (H-BGK), valid in the full Knudsen number (Kn) range, is proposed using Cartesian grid as a 3D tool to handle hypersonic aerothermodynamics from continuum to thermochemical nonequilibrium and ionized/plasma flows. H-BGK method is to provide automated sub-domain solutions by direct BGK method and the gaskinetic BGK method of Xu (BGKX) in the high and low Kn regimes respectively. Direct BGK employs the Shakov model using quadratures, i.e., values of the distribution function at certain discrete velocities being used in the integration, and high-order upwind scheme for its solution. The BGKX solver is a finite volume method, proven applicable for thermochemical nonequilibrium flows with accurate heat rate prediction. The Cartesian method proposed is a Gridless Boundary Condition Cartesian (GBCC) method due to Feng Liu, which is a grid-automated scheme with built-in multigrid to accelerate convergence and has proven applicable to unsteady/steady 3D flows. Phase I will validate H-BGK solutions with that of DSMC in terms of pressures and heat rates for cylinders and blunt cones at various Knudsen numbers. Phase II will fully develop the H-BGK solver in 3D with GBCC in chemically-reacting and ionization flows, boundary layer resolutions and aerothermodynamic prediction capability. BENEFIT: The developed hybrid BGK (H-BGK) solver with a Gridless Boundary Condition Cartesian (GBCC) grid framework can be used for hypersonic applications from continuum to rarefied flow regimes for thermochemical nonequilibrium effects up to ionization/plasma flows. H-BGK solver can generate accurate aerodynamic forces and heat rates, and GBCC will largely relief users heavy burden on meshing. Typical applications are for launch vehicles in space access, entry command module and ballutes in atmospheric entry ; plume flows in chemical engines or rockets. Civilian dual-use applications include micro flows and micro heat transfer, such as those inside Micro- or Nano- Electro-Mechanical Systems, MEMS/NEMS. Examples include the heat flow rate prediction of microchips inside a vacuum packaged enclosure, gas flows through micro-thrusters, gas phase chemical sensors, lab-on-a-chip. Potential customers include the Air Force, DoD, NASA and private sectors using the solver for hypersonic vehicle design/analysis. Civil applications will provide design/analysis methods for MEMs, and biomedical equipments.

* information listed above is at the time of submission.

Agency Micro-sites


SBA logo

Department of Agriculture logo

Department of Commerce logo

Department of Defense logo

Department of Education logo

Department of Energy logo

Department of Health and Human Services logo

Department of Homeland Security logo

Department of Transportation logo

Enviromental Protection Agency logo

National Aeronautics and Space Administration logo

National Science Foundation logo
US Flag An Official Website of the United States Government