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Efficient structural optimization for multiple load cases using adjoint sensitivities
Akgun, MA; Haftka, RT; Wu, KC; Walsh, JL; Garcelon, JH (American Institute of Aeronautics and Astronautics (AIAA), 2001-03-01)
Adjoint sensitivity calculation of stress, buckling, and displacement constraints may be much less expensive than direct sensitivity calculation when the number of load cases is large. In general, it is more difficult to i...
Cell-vertex based parallel and adaptive explicit 3D flow solution on unstructured grids
Yilmaz, E; Kavsaoglu, MS; Akay, HU; Akmandor, IS (Informa UK Limited, 2001-01-01)
A parallel adaptive Euler flow solution algorithm is developed for 3D applications on distributed memory computers. Significant contribution of this research is the development and implementation of a parallel grid adaptat...
System identification with generalized orthonormal basis functions: an application to flexible structures
Nalbantoglu, V; Bokor, J; Balas, G; Gaspar, P (Elsevier BV, 2003-03-01)
This paper presents an application of a multi-input/multi-output identification technique based on system-generated orthonormal basis functions to a flexible structure. A priori information about the poles of the system, p...
Post-buckling of composite I-sections. Part 2: Experimental validation
Papila, M; Akgun, MA; Niu, XK; Ifju, P (2001-01-01)
An experimental investigation was conducted in order to verify the theoretical model described in Part 1 as well as to obtain experimental insight and to generate a database for the post-buckling behavior of composite I-se...
Two-level composite wing structural optimization using response surfaces
Liu, B; Haftka, RT; Akgun, MA (Springer Science and Business Media LLC, 2000-10-01)
A two-level optimization procedure for composite wing design subject to strength and buckling constraints is presented. At wing-level design, continuous optimization of ply thicknesses with orientations of 0 degrees, 90 de...
Exergy balance of a general system with variation of environmental conditions and some applications
Gogus, YA; Camdali, U; Kavsaoglu, MS (2002-07-01)
An exergy balance of a system helps to identify causes of losses. Establishing an exergy balance necessitates correction terms if environmental conditions change over the time period under consideration or the system is mo...
3-DIMENSIONAL APPLICATION OF THE JOHNSON-KING TURBULENCE MODEL FOR A BOUNDARY-LAYER DIRECT METHOD
KAVSAOGLU, MS; KAYNAK, U; VANDALSEM, WR (Elsevier BV, 1991-01-01)
The Johnson-King turbulence model [1; AIAA Paper 84-0175 (1984)] as extended to three-dimensional flows was evaluated using a finite-difference boundary-layer direct method. Calculations were compared against the experimen...
Improvements to compressible Euler methods for low-Mach number flows
Sabanca, M; Brenner, G; Alemdaroglu, N (Wiley, 2000-09-30)
In the present study improvements to numerical algorithms for the solution of the compressible Euler equations at low Mach numbers are investigated. To solve flow problems for a wide range of Mach numbers, from the incompr...
Characteristic Euler shock-fitting formulation for multi-dimensional flows
Basesme, EA; Akmandor, IS; Ucer, AS (Wiley, 2003-09-30)
A three-dimensional explicit time marching algorithm has been developed for the numerical solution of inviscid internal flows. The formulation uses the natural streamline co-ordinate system. The unsteady Euler equations in...
Aerodynamic optimization of turbomachinery cascades using Euler/boundary-layer coupled genetic algorithms
Oksuz, O; Akmandor, IS; Kavsaoglu, MS (American Institute of Aeronautics and Astronautics (AIAA), 2002-05-01)
A new methodology is developed to find the optimal aerodynamic performance of a turbine cascade. A boundary-layer coupled Euler algorithm and a genetic algorithm are linked within an automated optimization loop. The multip...