Numerical Modelling of Kinetics-turbulence Interaction in High Mach Number Flows

Period of Performance: 05/02/1991 - 05/02/1993

$488K

Phase 2 SBIR

Recipient Firm

Cambridge Hydrodynamics, Inc.
PO BOX 1403
Princeton, NJ 08542
Principal Investigator

Research Topics

Abstract

IN PHASE I, WE HAVE DEVELOPED METHODS TO TREAT THE EFFECTS OF SHOCK/TURBULENCE INTERACIONS ON CHEMICAL REACTION RATES IN HIGH MACH NUMBER TURBULENCE, TO DETERMINE THE EFFECTS OF SHOCKLETS ON PREMIXED TURBULENT FLAME VELOCITIES, TO DETERMINE THE EFFECTS OF SOUND GENERATION ON REACTIONS, FOR RENORMALIZATION GROUP MODELLING OF SHOCK-DOMINATED REACTING FLOWS, AND FOR LARGE-EDDY SIMULATION OF THESE FLOWS. HERE, IN PHASE II, WE PROPOSE TO IMPLEMENT THESE DEVELOPMENTS INTO TWO GENERAL PURPOSE HIGH MACH NUMBER FLOW CODES; ONE, COMPNEK, IS AN EXTENSION TO HIGH MACH NUMBERS OF OUR LOW SPEED GENERAL GEOMETRY FLOW CODE NEKTON, NOW DISTRIBUTED COMMERCIALLY BY CREARE.X, INC. OUR PARTNER FOR PHASE III COMMERCIALIZATION; AND ALSO, THE SPARK 3D HIGH MACH NUMBER FLOW CODE DEVELOPED BY NASA LANGLEY RESEARCH CENTER AND UNITED TECHNOLOGIES RESEARCH CENTER, OUR PARTNER IN THIS PHASE II WORK. THESE CODES WILL BE ENHANCED TO HANDLE LARGEEDDY SIMULATIONS (LES) OR HIGH MACH NUMBER TURBULENCE FLOW INTERACTIONS AND TO PREDICT SCALE-DEPENDENT EFFECTS ON PROBABILITY DISTRIBUTION FUNCTIONS (PDFs) IN THESE SIMULATIONS. THE PREDICTION OF PDFs IN LES CODES, TO BE BASED ON OUR NEW THEORY OF PDFs IN TURBULENCE DESCRIBED IN DETAIL HERE, IS EXPECTED TO ENABLE DETAILED PREDICTIONS OF CHEMICAL KINETICS IN THESE DIFFICULT FLOWS.