A Conformal Thin Boundary Model for FDTD

TY - GEN

T1 - A Conformal Thin Boundary Model for FDTD

AU - Bourke, Samuel

AU - Dawson, John

AU - Robinson, Martin

AU - Porter, Stuart

N1 - ©2018 IEEE

PY - 2018/8/8

Y1 - 2018/8/8

N2 - Thin layer models are widely used in the finitedifference time-domain (FDTD) technique to efficiently modelboundaries in multi-scale simulations as they significantly reducesimulation run-times and memory requirements. These modelsoften utilise surface impedance boundary conditions (SIBCs) torepresent the material of the boundary. Conformal meshes are apopular method of representing curved and non-aligned surfacesin FDTD. These meshes deform cells in the FDTD grid around theboundary between bulk materials so as to more accurately represent the shape of the material. Here we present an algorithm that combines the efficiency of a thin layer model with the accuracy of a conformal mesh. The algorithm is applied to three resonant cavity models and the accuracy verified using comparisons to non-conformal meshes and analytic solutions. Improvements are shown in the accuracy of the resonant frequencies and magnitude of the shielding effectiveness (SE) of the cavities. It is also shown to reduce the prevalence of extraneous features in the frequency response of the SE that are apparent when using a stair-cased mesh.

AB - Thin layer models are widely used in the finitedifference time-domain (FDTD) technique to efficiently modelboundaries in multi-scale simulations as they significantly reducesimulation run-times and memory requirements. These modelsoften utilise surface impedance boundary conditions (SIBCs) torepresent the material of the boundary. Conformal meshes are apopular method of representing curved and non-aligned surfacesin FDTD. These meshes deform cells in the FDTD grid around theboundary between bulk materials so as to more accurately represent the shape of the material. Here we present an algorithm that combines the efficiency of a thin layer model with the accuracy of a conformal mesh. The algorithm is applied to three resonant cavity models and the accuracy verified using comparisons to non-conformal meshes and analytic solutions. Improvements are shown in the accuracy of the resonant frequencies and magnitude of the shielding effectiveness (SE) of the cavities. It is also shown to reduce the prevalence of extraneous features in the frequency response of the SE that are apparent when using a stair-cased mesh.

KW - Conformal Techniques

KW - Finite-Difference Time-Domain

KW - Surface-Impedance Boundary Condition

KW - Thin Layer

UR - http://www.scopus.com/inward/record.url?scp=85057081947&partnerID=8YFLogxK

U2 - 10.1109/NEMO.2018.8503410

DO - 10.1109/NEMO.2018.8503410

M3 - Conference contribution

SN - 978153865204

BT - 2018 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO) (NEMO2018)

ER -