Adjoint Based Aerodynamic Shape Optimization of Subsonic Submerged Intake

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. Initially NACA intake placed on a flat plate is solved and result is compared with reference study at subsonic flow conditions. Thereafter single objective shape optimization is employed which enhances the CL/CD from 0.08 to 0.53 at the end of design cycles. The second case is of trapezoidal-entrance intake placed in slender aerodynamic body. The results are compared with reference study and baseline case for optimization is established. The shape is optimized using multi objective function and for multiple free form deformation boxes. The intake remains flush with the body during the shape deformation process. The intake internal surface is then allowed to deform along the optimization steps. The pressure recovery increases by 3%. The third case is similar but with circular entrance in slender body. A single free form deformation box encloses the intake region and the deformation is allowed such that optimization creates a semi-submerged shape. The total pressure recovery increases by 2% and CL/CD also increases by 10%. In the last case again the trapezoidal entrance intake is employed. The optimization process is similar to the third case. The optimum shape produces a substantial deformation at the intake surface and a semi-submerged intake is finally formed. The total pressure recovery improves by 6% and an additional CL/CD ratio of 0.04 is achieved.


Adjoint Based Multi-Objective Optimization of Submerged Subsonic Intake
Ahmed, Ali; Tuncer, İsmail Hakkı (2021-01-12)
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 dra...
Effect of near-fault ground motion and damper characteristics on the seismic performance of chevron braced steel frames
Dicleli, Murat (Wiley, 2007-06-01)
This study is aimed at comparing the seismic performance of steel chevron braced frames (CBFs) with and without fluid viscous dampers (FVDs) as a function of the characteristics of the near-fault (NF) ground motion and FVD parameters. For this purpose, comparative nonlinear time history (NLTH) analyses of single and multiple storey CBFs with and without FVDs are conducted using NF ground motions with various velocity pulse periods scaled to have small, moderate and large intensities. Additionally, NLTH anal...
Küçük, Umut Can; Tuncer, İsmail Hakkı; Department of Aerospace Engineering (2022-12-28)
In this study, boundary layer ingesting and diverting submerged air inlets are design optimized with an adjoint-based optimization methodology based on RANS solu tions. The opensource SU2 software is employed for both RANS and adjoint solutions and for driving the gradient-based optimization. Total pressure recovery at the aerodynamic interface plane is taken as the main objective of the optimization, and the mass flow rate and the momentum distortion are closely monitored. It is first shown that the shape ...
Subsonic-transonic submerged intake design for a cruise missile
Akman, Oral; Eyi, Sinan; Department of Aerospace Engineering (2014)
In this thesis, aerodynamic design and optimization of subsonic-transonic submerged intake is done for specified cruise conditions. A gradient-based optimization algorithm is developed for intake design studies. Subsonic intake geometric parameterization is conducted and a generic submerged intake for a cruise missile is constructed by using CATIA V5 generative shape design module. Computational Fluid Dynamics (CFD) solver FloEFD v12 is used for computational analyses. Two NASA test cases are used for CFD t...
Computation of Vortical Flow Fields over a Close-Coupled Delta Canard-Wing Configuration and Adjoint Based Configuration Optimization
Tikenoğulları, Alp; Tuncer, İsmail Hakkı; Department of Aerospace Engineering (2022-2-10)
This study aims at investigating the vortical flow field over a close-coupled delta canard-wing configuration to understand the vortex interactions and the mechanism of lift enhancement provided by the canard, especially at high angles of attack, and employing an adjoint-based configuration optimization to achieve further enhancements in aerodynamic forces. An open-source CFD solver, SU2 is employed for both flow field computations and adjoint-based configuration optimizations. First, flow solutions with SU...
Citation Formats
A. AHMED, “Adjoint Based Aerodynamic Shape Optimization of Subsonic Submerged Intake,” Ph.D. - Doctoral Program, Middle East Technical University, 2021.