Hybrid Approach for Multi-Scale Modeling of Radiation Transfer in Three-Dimensional Non-Gray Media

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: FA9550-08-C-0069
Agency Tracking Number: F08A-020-0064
Amount: $99,915.00
Phase: Phase I
Program: STTR
Solicitation Topic Code: AF08-T020
Solicitation Number: 2008.A
Timeline
Solicitation Year: 2008
Award Year: 2008
Award Start Date (Proposal Award Date): 2008-09-26
Award End Date (Contract End Date): 2009-06-29
Small Business Information
215 Wynn Dr., 5th Floor, Huntsville, AL, 35805
DUNS: 185169620
HUBZone Owned: N
Woman Owned: Y
Socially and Economically Disadvantaged: N
Principal Investigator
 Sarma Rani
 Project Engineer
 (256) 726-4850
 tsb@cfdrc.com
Business Contact
 Deb Phipps
Title: Contracts Specialist
Phone: (256) 726-4884
Email: dap@cfdrc.com
Research Institution
 OHIO STATE UNIV.
 Sandip Mazumder
 Department of Mechanical Engin
201 West 19th Avenue
Columbus, OH, 43210
 (614) 247-8099
 Nonprofit college or university
Abstract
In this STTR project, an efficient and high-fidelity computational module to predict non-gray radiative transfer will be developed and validated. The proposed hybrid approach to solve the radiative transport equation (RTE) is a combination of the spherical harmonics (PN) method and the Monte-Carlo method. Non-gray gases will be treated using the full spectrum correlated k-distribution (FSCK) method. The proposed approach is unique and innovative for: (1) its ability to efficiently handle orders of magnitude variation in the medium optical thickness, and (2) its ability to solve the non-gray RTE at a small fraction of the computational cost of line-by-line calculations. CFDRC has teamed with Ohio State University (Prof. Sandip Mazumder) to develop the proposed module. In Phase I, the modified differential approximation (MDA) approach, along with the non-gray FSCK method, will be implemented and validated for simple 2-D geometries. MDA combines the lower-order spherical harmonics (i.e., P1) method for the diffusive component with a simplified view-factor based method for the ballistic component of radiative intensity. In Phase II, the view-factor method will be replaced with the more accurate and general Monte-Carlo method. The hybrid approach will be extended to three-dimensional geometry with arbitrary unstructured mesh topology. The radiation module will also be parallelized and demonstrated for practical cases to be determined in consultation with AFOSR.

* Information listed above is at the time of submission. *

US Flag An Official Website of the United States Government