Finite Element Domain Decomposition Method for Rough Sea Surface Scattering

2019-12-31
ÖZGÜN, ÖZLEM
Kuzuoğlu, Mustafa
Full-wave solution of electromagnetic wave scattering from rough sea surfaces is achieved by the Finite Element Domain Decomposition (FEDD) method. The method is implemented in a non-iterative manner by dividing the computational domain into overlapping subdomains, and solving the problem in each subdomain by attaching Locally-Conformal Perfectly Matched Layer (LC-PML) at the truncation boundaries. Statistical behavior of the Radar Cross Section (RCS) is investigated by Monte Carlo simulations. The results are compared with those obtained by the standard FEM, analytical models and measurements for different polarizations, frequencies, grazing angles and wind speeds.

Suggestions

Modeling and Predicting Surface Roughness via Transformation Optics
Ozgun, O.; Kuzuoğlu, Mustafa (2014-08-28)
Monte Carlo analysis of surface roughness in electromagnetic scattering problems is presented by using the principles of transformation electromagnetics/optics in finite methods. The main motivation in the proposed approach is to eliminate the need of mesh generation for each surface in repeated Monte Carlo realizations, and hence, to devise a faster model in predicting surface roughness. A single, simple and uniform mesh is employed assuming a smooth surface and ignoring the actual surface, and thereafter,...
Finite element modeling of scattering from objects in rectangular waveguides
Gülbaş, Hüseyin; Kuzuoğlu, Mustafa; Özlem, Özgün; Department of Electrical and Electronics Engineering (2017)
Numerical analysis of scattering parameters of split ring resonators which are one of the microwave circuit elements is performed by the Finite Element Method in this thesis. The fundamentals of the model and analysis method will be discussed firstly. Afterwards, the basics of Finite Element Method including weak variational form of the wave equation, 3D formulations and application to scattering parameters will be presented. The concepts of Perfectly Matched Layer and resonators will be examined in detail....
A Numerical Model for Investigating the Effect of Rough Surface Parameters on Radar Cross Section Statistics
Kuzuoğlu, Mustafa (2017-07-14)
Electromagnetic scattering from rough surfaces is modeled by combining the periodic finite element method and the transformation electromagnetics approach. The behavior of the radar cross section (RCS) at both specular and backscattering directions is analyzed as a function of rms height and correlation length with the help of Monte Carlo simulations. The concept of backscattering enhancement is illustrated, and some conclusions are drawn about the RCS statistics.
Finite element analysis of a projection-based stabilization method for the Darcy-Brinkman equations in double-diffusive convection
Cibik, Aytekin; Kaya Merdan, Songül (2013-02-01)
This paper presents a projection-based stabilization method of the double-diffusive convection in Darcy-Brinkman flow. In particular, it is concerned with the convergence analysis of the velocity, temperature and concentration in the time dependent case. Numerical experiments are presented to verify both the theory and the effectiveness of the method. (C) 2012 IMACS. Published by Elsevier B.V. All rights reserved.
Finite element modeling of electromagnetic radiation
Yılmaz, Asım Egemen; Kuzuoğlu, Mustafa; Department of Electrical and Electronics Engineering (2007)
In this thesis, quadratic hexahedral edge elements have been applied to the three dimensional for open region electromagnetic scattering problems. For this purpose, a semi-automatic all-hexahedral mesh generation algorithm is developed and implemented. Material properties inside the elements and along the edges are also determined and prescribed during the mesh generation phase in order to be used in the solution phase. Based on the condition number quality metric, the generated mesh is optimized by means o...
Citation Formats
Ö. ÖZGÜN and M. Kuzuoğlu, “Finite Element Domain Decomposition Method for Rough Sea Surface Scattering,” 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/56719.