Improved Modeling Tools for High Speed Reacting Flows

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: FA8650-05-M-2595
Agency Tracking Number: F051-194-2007
Amount: $99,977.00
Phase: Phase I
Program: SBIR
Solicitation Topic Code: AF05-194
Solicitation Number: 2005.1
Timeline
Solicitation Year: 2005
Award Year: 2005
Award Start Date (Proposal Award Date): 2005-03-28
Award End Date (Contract End Date): 2006-03-28
Small Business Information
6210 Keller's Church Road, Pipersville, PA, 18947
DUNS: 929950012
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Sanford Dash
 President & Chief Scientist
 (215) 766-1520
 dash@craft-tech.com
Business Contact
 Sanford Dash
Title: President & Chief Scientist
Phone: (215) 766-1520
Email: dash@craft-tech.com
Research Institution
N/A
Abstract
Recent work in high speed reacting flows has identified three areas in which model improvements are needed. (1) Multi-element grid adaptation for fuel injection problems - h-refinement (cell splitting) procedures being utilized in our grid adaptation tool, CRISPr, produce large meshes after several levels of refinement. Point redistribution (r-refinement) techniques based on moving mesh concepts can improve efficiency and will be implemented. (2) Scalar fluctuation modeling for high speed flows - a generalized framework is operational which predicts local values of Prt and Sct and works with our compressibility-corrected k model. Application to basic jet/shear layer flows has indicated good overall performance, but application to fuel injection flow problems has indicated that further turbulence modeling upgrades are required, which will be addressed in this program. (3) Chemical kinetic efficiency enhancement - using point implicit methodology with an iterative chemical kinetic solver leads to load unbalances since more work is done in regions with stiff chemistry. A new "work per node" load balancing technique, has permitted us to analyze hydro-carbon chemical systems with a large number of species and reactions with much greater efficiency. We will incorporate this procedure into our multi-element unstructured code, and make it operate with grid adaptation techniques.

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

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