Search Results - "Giannakoglou, K.C."

Single- and multiobjective evolutionary optimization assisted by Gaussian random field metamodels by Emmerich, M.T.M., Giannakoglou, K.C., Naujoks, B.

“…This paper presents and analyzes in detail an efficient search method based on evolutionary algorithms (EA) assisted by local Gaussian random field metamodels…”
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Design of optimal aerodynamic shapes using stochastic optimization methods and computational intelligence by Giannakoglou, K.C.

“…Optimization and inverse design methods based on stochastic and, in particular, evolutionary algorithms, are currently being used in aeronautics since they…”
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Continuous adjoint approach to the Spalart–Allmaras turbulence model for incompressible flows by Zymaris, A.S., Papadimitriou, D.I., Giannakoglou, K.C., Othmer, C.

“…A continuous adjoint formulation for the computation of the sensitivities of integral functions used in steady-flow, incompressible aerodynamics is presented…”
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Adjoint wall functions: A new concept for use in aerodynamic shape optimization by Zymaris, A.S., Papadimitriou, D.I., Giannakoglou, K.C., Othmer, C.

“…The continuous adjoint method for the computation of sensitivity derivatives in aerodynamic optimization problems of steady incompressible flows, modeled…”
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The continuous adjoint to the incompressible (D)DES Spalart-Allmaras turbulence models by Margetis, A.-S.I., Papoutsis-Kiachagias, E.M., Giannakoglou, K.C.

“…This article formulates the continuous adjoint method for the gradient-based shape optimization of fluid flows governed by the incompressible Detached Eddy…”
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CFD-based shape optimization under uncertainties using the Adjoint-assisted Polynomial Chaos Expansion and projected derivatives by Skamagkis, Th, Papoutsis-Kiachagias, E.M., Giannakoglou, K.C.

“…This paper is dealing with gradient-based optimization in fluid mechanics, in the presence of uncertainties, by focusing on turbulent flows governed by the…”
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Topology optimization in fluid mechanics using continuous adjoint and the cut-cell method by Vrionis, P.Y., Samouchos, K.D., Giannakoglou, K.C.

“…A topology optimization method for steady-state flows of incompressible fluids which is capable of imposing accurate boundary conditions along the solid walls…”
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On the proper treatment of grid sensitivities in continuous adjoint methods for shape optimization by Kavvadias, I.S., Papoutsis-Kiachagias, E.M., Giannakoglou, K.C.

“…The continuous adjoint method for shape optimization problems, in flows governed by the Navier–Stokes equations, can be formulated in two different ways, each…”
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Lossy compression techniques supporting unsteady adjoint on 2D/3D unstructured grids by Margetis, A.-S.I., Papoutsis-Kiachagias, E.M., Giannakoglou, K.C.

“…This paper proposes and assesses remedies to the significant storage requirements of unsteady adjoint methods used in gradient-based optimization, in…”
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The continuous adjoint method for shape optimization in Conjugate Heat Transfer problems with turbulent incompressible flows by Gkaragkounis, K.T., Papoutsis-Kiachagias, E.M., Giannakoglou, K.C.

“…•Continuous adjoint for Conjugate Heat Transfer (CHT) shape optimization.•Adjoint turbulence equations derived for the first time in CHT problems.•Novel…”
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The continuous adjoint cut-cell method for shape optimization in cavitating flows by Vrionis, P.Y., Samouchos, K.D., Giannakoglou, K.C.

“…•Development of a continuous adjoint formulation for cavitating flows employing a Transport Equation-based Model (TEM).•Accurate computation of geometric…”
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A painless intrusive polynomial chaos method with RANS-based applications by Chatzimanolakis, M., Kantarakias, K.-D., Asouti, V.G., Giannakoglou, K.C.

“…This paper presents a method for the quantification of uncertainty propagation using intrusive Polynomial Chaos Expansion (iPCE). Contrary to commonly…”
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Adjoint-assisted Pareto front tracing in aerodynamic and conjugate heat transfer shape optimization by Gkaragkounis, K.T., Papoutsis-Kiachagias, E.M., Giannakoglou, K.C.

“…•Adjoint-assisted Pareto front tracing, using Prediction-Correction algorithms.•Capability to control the distance between Pareto Points and satisfy…”
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Optimisation of military aircraft engine maintenance subject to engine part shortages using asynchronous metamodel-assisted particle swarm optimisation and Monte-Carlo simulations by Antonakis, A.S., Giannakoglou, K.C.

“…Comprising the coordination of various maintenance levels, flight maintenance planning (FMP) constitutes an appealing and hard-to-solve optimisation problem…”
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pFOSM: An efficient algorithm for aerodynamic robust design based on continuous adjoint and matrix-vector products by Fragkos, K.B., Papoutsis-Kiachagias, E.M., Giannakoglou, K.C.

“…•Gradient-based aerodynamic robust design using the Method of Moments.•Computation of matrix-vector products to reduce the CPU cost.•Computational cost…”
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The continuous adjoint method for the design of hydraulic turbomachines by Papoutsis-Kiachagias, E.M., Kyriacou, S.A., Giannakoglou, K.C.

“…This article presents the development and application of the continuous adjoint method for designing/optimizing the shape of hydraulic turbomachines. The…”
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Transition from adjoint level set topology to shape optimization for 2D fluid mechanics by Koch, J.R.L., Papoutsis-Kiachagias, E.M., Giannakoglou, K.C.

“…•2D topology optimization solution process for CAD-compatibility.•Transition from level set based topology to shape optimization.•Signed distance matching…”
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The continuous adjoint approach to the k-ε turbulence model for shape optimization and optimal active control of turbulent flows by Papoutsis-Kiachagias, E.M., Zymaris, A.S., Kavvadias, I.S., Papadimitriou, D.I., Giannakoglou, K.C.

“…The continuous adjoint to the incompressible Reynolds-averaged Navier-Stokes equations coupled with the low Reynolds number Launder-Sharma k-ε turbulence model…”
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Noise reduction in car aerodynamics using a surrogate objective function and the continuous adjoint method with wall functions by Papoutsis-Kiachagias, E.M., Magoulas, N., Mueller, J., Othmer, C., Giannakoglou, K.C.

“…•Continuous adjoint method with a fully differentiated turbulence model.•Supplement to adjoint wall functions for volume integral objective…”
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CFD-based analysis and two-level aerodynamic optimization on graphics processing units by Kampolis, I.C., Trompoukis, X.S., Asouti, V.G., Giannakoglou, K.C.

“…This paper presents the porting of 2D and 3D Navier–Stokes equations solvers for unstructured grids, from the CPU to the graphics processing unit (GPU;…”
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