Overview

The objective of the second phase of the Euler Technology Assessment program was to evaluate the ability of Euler computational fluid dynamics codes to predict compressible flow effects over a generic fighter wind tunnel model. This portion of the study was conducted by Lockheed Martin Tactical Aircraft Systems, using an in-house Cartesian-grid code called SPLITFLOW. The Cartesian grid technique offers several advantages, including ease of volume grid generation and reduced number of cells compared to other grid schemes. SPLITFLOW also includes grid adaption of the volume grid during the solution to resolve high-gradient regions. The SPLITFLOW code predictions of configuration forces and moments are shown to be adequate for preliminary design, including predictions of sideslip effects and the effects of geometry variations at low and high angles-of-attack. The transonic pressure prediction capabilities of SPLITFLOW are shown to be improved over subsonic comparisons. The time required to generate the results from initial surface data is on the order of several hours, including grid generation, which is compatible with the needs of the design environment. Finley, Dennis B. and Karman, Steve L., Jr. Langley Research Center COMPRESSIBILITY EFFECTS; COMPUTATIONAL FLUID DYNAMICS; EULER EQUATIONS OF MOTION; UNSTRUCTURED GRIDS (MATHEMATICS); CARTESIAN COORDINATES; TRANSONIC FLOW; VORTICES; ANGLE OF ATTACK; GRID GENERATION (MATHEMATICS); SIDESLIP; PRESSURE DISTRIBUTION; AERODYNAMIC LOADS; FIGHTER AIRCRAFT...

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