Numerical Investigation of Nano-Cavities for Optimal Power Absorption in Solar Cells

2018-06-01
Karaosmanoglu, Bariscan
Topcuoglu, Ulas
Tuygar, Emre
Ergül, Özgür Salih
We present a numerical study of nano-cavities used in solar cells for energy harvesting, by employing surface integral equations based on Maxwell's equations in the frequency domain and an efficient solver based on the multilevel fast multipole algorithm (MLFMA). With the three-dimensional modeling of surfaces, we obtain accurate results to evaluate the performances of different structures for improved power absorption in solar cells. This paper includes a brief description of the developed solver and initial numerical examples on various solar cells involving inverted pyramids and spherical cavities.

Suggestions

Design and simulation of nana-optical beam generators based on zero-index materials
Eris, Ozgur; Abanuzoglu, Tutku; Ergül, Özgür Salih (2019-09-01)
We present design and computational analysis of near-zero-index (NZI) structures that act as nano-optical beam generators when excited internally by isotropic sources. The designed structures have homogenized shell geometries with various modifications to generate asymmetric tridirectional, bidirectional, and unidirectional beams, in addition to symmetric ones. NZI properties make it possible to generate beams from planar surfaces, while numerical results show that the behavior of a shell is very sensitive ...
Design and performance analysis of a pump-turbine system using computational fluid dynamics
Yıldız, Mehmet; Albayrak, Kahraman; Çelebioğlu, Kutay; Department of Mechanical Engineering (2011)
In this thesis, a parametric methodology is investigated to design a Pump-Turbine system using Computational Fluid Dynamics ( CFD ). The parts of Pump-Turbine are created parametrically according to the experience curves and theoretical design methods. Then, these parts are modified to obtain 500 kW turbine working as a pump with 28.15 meters head. The final design of Pump-Turbine parts are obtained by adjusting parameters according to the results of the CFD simulations. The designed parts of the Pump-Turbi...
Rigorous Analysis of Double-Negative Materials with the Multilevel Fast Multipole Algorithm
Ergül, Özgür Salih (2012-02-01)
We present rigorous analysis of double-negative materials (DNMs) with surface integral equations and the multilevel fast multipole algorithm (MLFMA). Accuracy and efficiency of numerical solutions are investigated when DNMs are formulated with two recently developed formulations, i.e., the combined tangential formulation (CTF) and the electric and magnetic current combined-field integral equation (JMCHE). Simulation results on canonical objects are consistent with previous results in the literature on ordin...
Numerical Implementation of Equivalence Principle Algorithm for Potentials
Farshkaran, Ali; Ergül, Özgür Salih (2018-07-13)
We present a novel implementation of the equivalence principle algorithm (EPA) applied to the recently developed potential integral equations (PIEs) for low-frequency problems involving perfect electric conductors. The equivalence integral equations are generalized and updated by including potentials, making it possible to use PIEs to formulate inner problems. The stability of the implementation is demonstrated on canonical objects.
Direct Calculation of Entropy Generation by Solving Reynolds-Averaged Entropy Transport Equation in an Air-Cooled Turbine Cascade
Orhan, Omer Emre; Uzol, Oğuz (2012-06-15)
This paper presents an implementation of directly solving Reynolds-Averaged Entropy Transport equation as a part of the CFD solution to predict entropy generation rates in a two-dimensional turbine blade stator section. The Reynolds Averaged Entropy Transport and the necessary modeling. equations are implemented to a commercial CFD solver as a User Defined Scalar (UDS). The results are compared with those obtained by post-processing the temperature and velocity fields obtained by solving full Navier-Stokes ...
Citation Formats
B. Karaosmanoglu, U. Topcuoglu, E. Tuygar, and Ö. S. Ergül, “Numerical Investigation of Nano-Cavities for Optimal Power Absorption in Solar Cells,” 2018, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/52643.