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Efficient Kinetic/Continuum Simulations of Hypervelocity Gas Flows in…

Award Information

Agency:
Department of Defense
Branch:
Air Force
Award ID:
90147
Program Year/Program:
2009 / STTR
Agency Tracking Number:
F08A-019-0067
Solicitation Year:
N/A
Solicitation Topic Code:
N/A
Solicitation Number:
N/A
Small Business Information
Cascade Technologies Incorporated
2445 Faber Place #100 Palo Alto, CA -
View profile »
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
 
Phase 1
Fiscal Year: 2009
Title: Efficient Kinetic/Continuum Simulations of Hypervelocity Gas Flows in Nonequilibrium Dissociation and Ionization for Earth Atmospheres
Agency / Branch: DOD / USAF
Contract: FA9550-09-C-0055
Award Amount: $99,976.00
 

Abstract:

In this project, we propose an original method to simulate dissociated and ionized hypersonic air flows from continuum to rarefied regimes for a wide range of scales inherent in Air Force applications. We will introduce the most consistent physical model currently available in kinetic theory. The applicability range of fluid dynamical descriptions used for continuum flows can be extended to the transition regime by taking a finite sequence of moments of the Boltzmann equation together with a closure assumption. The resulting Boltzmann moment systems, solved by CFD methods, are computationally more efficient than statistical methods such as DSMC in the continuum and transition regimes. Therefore, we propose to develop a numerical scheme by blending the Boltzmann moment systems with Levermore closure and the DSMC technique, as opposed to traditional schemes based on the Navier-Stokes equations and DSMC. The coupling will be based on the concept of physics hybridization currently used to couple two vastly different representations of turbulent flows. In Phase I of this project, we will focus on the extension of the Boltzmann moment systems with Levermore closure to dissociating and ionizing hypersonic flows and the development of the computational strategy for the kinetic/continuum algorithm.

Principal Investigator:

Shoreh Hajiloo
General Manager
6506916967
hajiloo@turbulentflow.com

Business Contact:

Parviz Moin
President
6502244882
moin@turbulentflow.com
Small Business Information at Submission:

CASCADE TECHNOLOGIES, INC.
1330 Charleston Road Mountain View, CA 94043

EIN/Tax ID: 043353686
DUNS: N/A
Number of Employees:
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
Research Institution Information:
STANFORD UNIV.
Building 520
Mechanical Engineering Dept.
Stanford, CA 94305
Contact: Mark Cappelli
Contact Phone: (650) 725-2020
RI Type: Nonprofit college or university