Adjoint Based Multi-Objective Optimization of Submerged Subsonic Intake

The present study describes the adjoint based shape optimization of sub-merged trapezoidal intake. Initially direct results on the baseline geometries are compared with published results which are found to be in good agreement. Thereafter study proceeds to shape optimization using as multiobjective optimization technique. The combined multi-objective objective function is employed, comprising of total pressure at AIP and lift of the aerodynamic body. The inherent shape of the sub-merged intake gives low drag but also low-pressure recovery, therefore lift as an additional objective can give advantage over other intake types. The study is performed using SU2 the flow solver together with the built-in adjoint solver and the FFD box which is the shape deformation tool in a parallel computing environment. A reduction in total pressure loss of 10% was achieved at AIP while CL/CD increased for the overall body.


Adjoint Based Aerodynamic Shape Optimization of Subsonic Submerged Intake
AHMED, ALI; Tuncer, İsmail Hakkı; Department of Aerospace Engineering (2021-5-04)
In this study the aerodynamic shape optimization of subsonic submerged intake is performed. The total pressure at the aerodynamic interface plane and lift are employed as objective functions. Drag is constrained and employed as penalty objective. Open-ware platforms are used including SALOME for solid modeling, GMSH for the hybrid mesh generation and SU2 for flow solutions and adjoint based shape optimization. Free form deformation box is employed for shape parameterization and surface deformation. Ini...
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The main purpose of this study is to develop a flow solver that employs triangular grids to solve two-dimensional, viscous, laminar, steady, incompressible flows. The flow solver is based on Least Squares Spectral Element Method (LSSEM). It has p-type adaptive mesh refinement/coarsening capability and supports p-type nonconforming element interfaces. To validate the developed flow solver several benchmark problems are studied and successful results are obtained. The performances of two different triangular ...
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This study is related to flow measurement structures of asymmetric compound cross section mostly suggested for sediment laden-rivers, streams and wadis. Nine different models of asymmetrical rectangular cross sections were tested for a wide range of discharges. In each model, the stages and corresponding discharges were measured. From these measurements, the average discharges utilizing the Phi-indices Approach were determined. In addition, a multivariable regression model was derived with high accuracy for...
Uncertainty based analysis of seepage through earth-fill dams
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The steady-state and transient seepage through embankment dams are investigated considering the uncertainty of hydraulic conductivity and van Genuchten fitting parameters, α and n used for unsaturated flow modeling. A random number generation algorithm producing random values for these parameters is coupled with a finite element software, SEEP/W to analyze seepage through earth-fill dams. Monte Carlo simulation is adopted for stochastic seepage analyses. The variability effects of the random parameters on s...
Citation Formats
A. Ahmed and İ. H. Tuncer, “Adjoint Based Multi-Objective Optimization of Submerged Subsonic Intake,” presented at the 18th International Bhurban Conference on Applied Sciences and Technologies, IBCAST 2021, Virtual, Islamabad, Pakistan, 2021, Accessed: 00, 2021. [Online]. Available: