Discrete Adjoint-Based Simultaneous Analysis and Design Approach for Conceptual Aerodynamic Optimization
Journal Title: INCAS BULLETIN - Year 2017, Vol 9, Issue 3
Abstract
In this paper, a simultaneous analysis and design method is derived and applied for a non-linear constrained aerodynamic optimization problem. The method is based on the approach of defining a Lagrange functional based on the objective function and the aerodynamic model’s equations, using two sets of multipliers. A fully-coupled, non-linear system of equations is derived by requiring that the Gateaux variation of the Lagrange functional vanishes for arbitrary variations of the aerodynamic model’s dependent variables and design parameters. The optimization problem is approached using a one-shot technique, by solving the non-linear system in which all sensitivities and problem constraints are included. The computational efficiency of the method is compared against a gradient-based optimization algorithm using adjoint-provided gradient. A conceptual-stage aerodynamic optimization problem is solved, based on a non-linear numerical lifting-line method with viscous corrections.
Authors and Affiliations
Oliviu SUGAR-GABOR
Buckling of Flat Thin Plates under Combined Loading
This article aims to provide a quick methodology to determine the critical values of the forces applied to the central plane of a flat isotropic plate at which a change to the stable configuration of equilibrium occurs....
Brinkman–Forchheimer-Darcy flow past an impermeable cylinder embedded in a porous medium
For the flow past an impervious cylinder embedded in a fluid saturated porous medium only the linear (Darcy and Darcy - Brinkman) models were used. In this work, the flow past an impermeable cylinder embedded in a fluid...
An impact study of a capsule with a rigid wall using the SPH approach
Impact problems have always been of interest in the Aerospace industry because events such as “bird-strikes” occur quite often and necessary studies must be performed to observe the behavior of structures during the impa...
LAMINAR STABILITY ANALYSIS IN BOUNDARY LAYER FLOW
This study presents a numerical study concerning the flow control by suction and injection. The case study is over a symmetrical airfoil with suction and injection slots. The angle of attack is 3 degree with the Mach num...
Automation and Systems Issues in Air Traffic Control
This paper is dedicated to the study and analysis of a successfully designed control system in ATM. The aircraft's motion is affected by other factors, besides the pilot controls in the form of external disturbances, suc...