Accession Number : ADA289758

Title :   Floating Shock Fitting Via Lagrangian Adaptive Meshes.

Descriptive Note : Contractor rept.,

Corporate Author : INSTITUTE FOR COMPUTER APPLICATIONS IN SCIENCE AND ENGINEERING HAMPTON VA

Personal Author(s) : Van Rosendale, John

PDF Url : ADA289758

Report Date : NOV 1994

Pagination or Media Count : 25

Abstract : In recent works we have formulated a new approach to compressible flow simulation, combining the advantages of shock-fitting and shock-capturing. Using a cell-centered Roe scheme discretization on unstructured meshes, we warp the mesh while marching to steady state, so that mesh edges align with shocks and other discontinuities. This new algorithm, the Shock-fitting Lagrangian Adaptive Method (SLAM) is, in effect, a reliable shock-capturing algorithm which yields shock-fitted accuracy at convergence. Shock-capturing algorithms like this, which warp the mesh to yield shock-fitted accuracy, are new and relatively untried. However, their potential is clear. In the context of sonic booms, accurate calculation of near-field sonic boom signatures is critical to the design of the High Speed Civil Transport (HSCT). SLAM should allow computation of accurate N-wave pressure signatures on comparatively coarse meshes, significantly enhancing our ability to design low-boom configurations for high-speed aircraft. (MM)

Descriptors :   *SHOCK WAVES, *COMPRESSIBLE FLOW, *SUPERSONIC FLIGHT, *SONIC BOOM, ALGORITHMS, HIGH VELOCITY, WIND, COMPUTATIONAL FLUID DYNAMICS, AIRFOILS, MESH, WAKE, ADAPTIVE SYSTEMS, MACH NUMBER, EULER EQUATIONS, DISCONTINUITIES, BOUNDARY LAYER FLOW, TRANSONIC AIRCRAFT.

Subject Categories : Aerodynamics
      Acoustics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE