A continuous adjoint method with objective function derivatives based on boundary integrals, for inviscid and viscous flows

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Aerodynamic Shape Optimization Using First and Second Order Adjoint and Direct Approaches (2008, background): “No extra Lagrange multipliers are introduced for the turbulence model equations and the sensitivity of turbulent viscosity with respect to design variables is zero, [22, 49, 116].”
Direct, adjoint and mixed approaches for the computation of Hessian in airfoil design problems (2008, unknown): “Among them, it is appropriate to mention the one-shot algorithm, in which the flow (state), adjoint (costate) and optimization equations are solved simultaneously [14, 15], the incomplete gradient method that skips the computation of costly terms [16], the reduced gradient method that overcomes grid”
Optimization and Computational Fluid Dynamics (2008, methodology): “a hydrodynamic fluctuation term p̃ [33, 53]:”