A STRATEGY COMBINING REGIONALLY ADAPTED PROCESSES (SCRAP)

A STRATEGY COMBINING REGIONALLY ADAPTED PROCEESSES (SCRAP) IS PROPOSED FOR SIMULATING TRANSONIC OR SUPERSONIC FLOW OVER PHYSICALLY AND GEOMETRICALLY COMPLEX FINNED MISSILE CONFIGURATIONS. FLOW FIELDS OFTEN INCLUDE SUBDOMAINS DOMINATED BY DIFFERENT PHYSICAL PROCESSES. A TECHNIQUE IS PROPOSED IN WHICH EACH ZONE HAS AN ASSOCIATED NUMERICAL SCHEME AND COULD BE SUBJECT TO AUTOMATIC LOCAL EMBEDDING. THIS METHOD WILL ALLEVIATE THE NEED FOR A SINGLE GRID AND CONCENTRATE RESOURCES IN MODELING COMPLEX PHYSICS ONLY AN IMPORTANT REGIONS. PHASE I OBJECTIVES INCLUDE IMPLEMENTING SOLVERS, DEVELOPING DATA MANAGEMENT SYSTEM, SPECIFYING ZONAL INTERFACE CONDITIONS, AND ASESSING THE POTENTIAL OF THE TECHNIQUE. THIS PROJECT WILL RESULT IN AN ANALYSIS TOOL THAT WILL CARRY OUT FLOW SIMULATIONS FOR COMPLEX AND IRREGULAR FIN GEOMETRIES WITH CRUDE AERODYNAMIC SHAPES AND LARGE ATTACK ANGLES. SUCH SIMULATIONS OFTEN INVOLVE PHYSICALLY COMPLEX CONDITIONS OF FLOW SEPARATION, RECIRCULATION AND INTERACTIONS OF SHOCK WAVES. THE SCRAP SCHEME WILL MORE ACCURATELY PREDICT THE RESULTANT FORCES AND MOMENTS ON PRACTICAL FIN GEOMETRIES. IT WILL ALSO SIGNIFICANTLY REDUCE COMPUTATIONAL REQUIREMENTS OF CPU TIME AND STORAGE AND AT THE SAME TIME WILL BE COMPARATIVELY MORE ACCURATE THAN THE CONVENTIONAL SCHEMES. THIS WILL LED TO AN ACCURATE COMPUTATION OF THE TRAJECTORIES AND BETTER DESIGN FOR GUIDED PROJECTILES.