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VORTEX-SCALAR ELEMENT CALCULATIONS OF A CONFINED CHEMICALLY REACTING MIXING…

Award Information

Agency:
Department of Defense
Branch:
Air Force
Award ID:
5856
Program Year/Program:
1987 / SBIR
Agency Tracking Number:
5856
Solicitation Year:
N/A
Solicitation Topic Code:
N/A
Solicitation Number:
N/A
Small Business Information
Flow Research Inc
21414 - 68th Avenue South Kent, WA 98032
View profile »
Woman-Owned: No
Minority-Owned: Yes
HUBZone-Owned: No
 
Phase 1
Fiscal Year: 1987
Title: VORTEX-SCALAR ELEMENT CALCULATIONS OF A CONFINED CHEMICALLY REACTING MIXING LAYER
Agency / Branch: DOD / USAF
Contract: N/A
Award Amount: $50,000.00
 

Abstract:

THIS PROPOSAL DESCRIBES A COMPUTATIONAL EFFORT, BASED ON A LAGRANGIAN "VORTEX-SCALAR ELEMENT" METHOD, FOR THE SIMULATION OF A TIME-DEPENDENT MIXING LAYER UNDER BOTH NONREACTING AND NONPREMIXED REACTING CONDITIONS. THE METHOD REPRESENTS VORTICITY AND SCALARS (CONCENTRATIONS AND TEMPERATURE) BY "VORTEX" AND "SCALAR" ELEMENTS, RESPECTIVELY, AND HAS THE ADVANTAGE THAT HIGH REYNOLDS NUMBER FLOWS CAN BE SIMULATED ACCURATELY. IN PHASE I, SIMULATIONS WILL BE PERFORMED FOR A TWO-DIMENSIONAL, SPATIALLY DEVELOPING MIXING LAYER. THE FOLLOWING PHYSICAL PHENOMENA WILL BE CONSIDERED: (1) THE ASYMMETRIC MIXING MECHANISM IN A NONREACTING MIXING LAYER; (2) INTERACTIONS BETWEEN LARGE COHERENT STRUCTURES AND FINITE RATE CHEMICAL REACTIONS IN A DILUTE REACTING MIXING LAYER; AND (3) THE NONEQUILIBRIUM EFFECTS OF VARIABLE-TEMPERATURE CHEMICAL REACTIONS ON THE IGNITION AND EXTINCTION CHARACTERISTICS OF A DIFFUSION FLAME. IN PHASE II, A NEW SCHEME WILL BE IMPLEMENTED TO SOLVE THE SCALAR TRANSPORT EQUATIONS, AND THE THREE-DIMENSIONAL PROBLEM WILL BE STUDIED. THE SCALAR ELEMENTS WILL BE REPLACED BY "SCALAR GRADIENT ELEMENTS" FOR THE SOLUTION OF THE SCALAR TRANSPORT EQUATIONS. THIS WILL IMPROVE THE EFFICIENCY AND THE SPATIAL RESOLUTION OF THE NUMERICAL PROCEDURES SUBSTANTIALLY. NEXT, THREE-DIMENSIONAL CALCULATIONS BY TRACING "VORTEX FILAMENTS" WILL BE PERFORMED. SUCH SIMULATIONS WILL EXHIBIT THE EFFECTS OF THREE-DIMENSIONAL TURBULENCE MOTION ON THE CHEMICAL REACTIONS AND ALSO WILL DETERMINE THE RANGE OF VALIDITY OF RECENTLY DEVELOPED ADVANCED TURBULENCE MODELS FOR THE PREDICTION OF SUCH FLOWS.

Principal Investigator:

Dr peyman givi
2068728500

Business Contact:

Small Business Information at Submission:

Flow Research Co
21414 - 68th Ave S Kent, WA 98032

EIN/Tax ID:
DUNS: N/A
Number of Employees:
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No