Accession Number : ADA309459

Title :   Observations Regarding Use of Advanced CFD Analysis, Sensitivity Analysis, and Design Codes in MDO.

Descriptive Note : Contractor rept.,

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

Personal Author(s) : Newman, Perry A. ; Hou, Gene J.W. ; Taylor, Arthur C., III

PDF Url : ADA309459

Report Date : MAR 1996

Pagination or Media Count : 19

Abstract : Observations regarding the use of advanced computational fluid dynamics (CFD) analysis, sensitivity analysis (SA), and design codes in gradient-based multidisciplinary design optimization (MDO) reflect our perception of the interactions required of CFD and our experience in recent aerodynamic design optimization studies using CFD. Sample results from these latter studies are summarized for conventional optimization (analysis-SA codes) and simultaneous analysis and design optimization (design code) using both Euler and Navier-Stokes flow approximations. The amount of computational resources required for aerodynamic design using CFD via analysis-SA codes is greater than that required for design codes. Thus, an MDO formulation that utilizes the more efficient design codes where possible is desired. However, in the aerovehicle MDO problem, the various disciplines that are involved have different design points in the flight envelope; therefore, CFD analysis-SA codes are required at the aerodynamic 'off design' points. The suggested MDO formulation is a hybrid multilevel optimization procedure that consists of both multipoint CFD analysis-SA codes and multipoint CFD design codes that perform suboptimizations.

Descriptors :   *OPTIMIZATION, *COMPUTER AIDED DESIGN, *COMPUTATIONAL FLUID DYNAMICS, *WING BODY CONFIGURATIONS, MATHEMATICAL MODELS, EFFICIENCY, TURBULENT FLOW, THREE DIMENSIONAL, FLOW FIELDS, APPROXIMATION(MATHEMATICS), AERODYNAMIC DRAG, HYDRODYNAMIC CODES, SYSTEMS ANALYSIS, EULER EQUATIONS, DESIGN CRITERIA, NAVIER STOKES EQUATIONS, VISCOUS FLOW, PRESSURE DISTRIBUTION, AERODYNAMIC LIFT, TRANSONIC AIRFOILS.

Subject Categories : Fluid Mechanics
      Aerodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE