Simulation of Massively Separated Flow Around a Missile at Angle of Attack UsingSolution-Adaptive Re-Meshing

摘要

Simulation of massively separated flow around a missile at various angle ofattack using solution adaptive remeshing is performed. These simulations are exercised in support of the KTA2-12 program which is designed to evaluate computational technology for predicting highly separated flow fields for missile configurations. A new weight function using Boolean sum of pertinent solution gradient and curvature terms with appropriate scaling and normalization is developed. The new weight function is applicable to wide range of grid adaptive problems with no user input. The adaptive algorithms have been cast into a parallel multiblock adaptive grid system using MPI. The improvement in the convergence level and better agreement of flow solutions with experimental force and moment coefficients with flow solutions have been demonstrated by using the adaptive process. The computer codes NPARC and CFL3D are utilized for respective flow field simulations.