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MULTILEVEL ADAPTIVE METHODS FOR THE EAGLE CODE

Award Information

Agency:
Department of Defense
Branch:
Air Force
Award ID:
12342
Program Year/Program:
1990 / SBIR
Agency Tracking Number:
12342
Solicitation Year:
N/A
Solicitation Topic Code:
N/A
Solicitation Number:
N/A
Small Business Information
Colorado Research Development
1727 Conestoga St Boulder, CO 80301
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Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
 
Phase 1
Fiscal Year: 1990
Title: MULTILEVEL ADAPTIVE METHODS FOR THE EAGLE CODE
Agency / Branch: DOD / USAF
Contract: N/A
Award Amount: $49,861.00
 

Abstract:

THE EAGLE GRID GENERATION CODE IS A WIDELY USED SOFTWARE TOOL FOR GENERATING COMPUTATIONALLY UNIFORM GRIDS THAT FIT IRREGULAR PHYSICAL DOMAINS. BASED ON ELLIPTIC GRID GENERATION, IT USES A BLOCKSTRUCTURED APPROACH TO ACCOMMODATE VERY IRREGULAR REGIONS AND POINT DISTRIBUTION FUNCTIONS TO REDUCE FLOW-SOLVER TRUNCATION ERROR. IT ALSO INCORPORATES AS EULER SOLVER FOR INVISCID FLOW CALCULATIONS. WHILE THE EAGLE CODE HAS SUBSTANTIALLY IMPROVED COMPUTATIONAL CAPABILITIES, THERE ARE SEVERAL OF ITS FEATURES THAT COULD BE DRAMATICALLY IMPROVED BY INCORPORATING MULTILEVEL SOLUTION TECHNIQUES.FIRST, MULTIGRID SOLVRS FOR THE CURRENT GLOBAL GRID EQUATIONS WOULD SHARPLY IMPROVE GRID SMOOTHNESS AND GRID/FLOW SOLVER PERFORMANCE. SECOND, MULTILEVEL ADAPTIVE SCHEMES WOULD PROVIDE THE ABILITY TO EFFICIENTLY GENERATE REFINED BUT SMOOTH LOCAL PATCHES FOR INCREASING RESOLUTION AND ACCURACY AT BODY SURFACES, SINGULAR AND STAGNATION POINTS, SHOCKS, AND OTHER PHENOMENA. FINALLY, THE MULTILEVEL ADAPTIVE METHODS WOULD IMPROVE THE FLOW SIMULATION BY ALLOWING BETTER LOCAL FLOW MODELS IN ADDITION TO HIGHER RESOLUTION. IN PARTICULAR, THE FULL NAVIER-STOKES EQUATIONS COULD BE USED TO INCLUDE VISCOUS EFFECTS IN SPECIAL AREAS OF INTEREST (E.G., BOUNDARY LAYERS). SUCH LOCAL MODELS WOULD COME AT LITTLE ADDITIONAL COST YET WOULD PROVIDE INCREASED ACCURACY THROUGHOUT THE DOMAIN. THE PROJECT OBJECTIVES ARE TO IMPLEMENT THESE MULTILEVEL ENHANCEMENTS TO THE EAGLE CODE.

Principal Investigator:

Chaoqun Liu
3032938633

Business Contact:

Small Business Information at Submission:

Colorado Research Development
621 - 17th St/ste 1620 Denver, CO 80293

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