Lattice consists of a multiplicity of such Yeecells. Illustration of a standard Cartesian Yee cell usedfor FDTD, about which electric and magneticįield vector components are distributed.Visualized as a cubic voxel, the electric fieldĬomponents form the edges of the cube, and themagnetic field components form the normals tothe faces of the cube.
#Fdtd wikipedia software
At present (2008), there are at least 27 commercial/proprietaryFDTD software vendors 8 free-software/ open-source-software FDTD projects and 2 freeware/closed-sourceFDTD projects, some not for commercial use (see External links).ġ Workings of the FDTD method2 Using the FDTD method3 Strengths of FDTD modeling4 Weaknesses of FDTD modeling5 Grid truncation techniques for open-region FDTD modeling problems6 History of FDTD techniques and applications for Maxwell's equations7 Popularity8 See also9 References10 Further reading11 External linksįinite-difference time-domain method - Wikipedia, the free encyclopedia In 2006, an estimated 2,000 FDTD-related publications appeared in the scienceand engineering literature (see Popularity). CurrentFDTD modeling applications range from near-DC (ultralow-frequency geophysics involving the entire Earth-ionosphere waveguide) through microwaves (radar signature technology, antennas, wireless communicationsdevices, digital interconnects, biomedical imaging/treatment) to visible light (photonic crystals, nanoplasmonics,solitons, and biophotonics). Since about 1990, FDTD techniques have emerged as primary means to computationally model many scientificand engineering problems dealing with electromagnetic wave interactions with material structures. The descriptor "Finite-difference time-domain" and itscorresponding "FDTD" acronym were originated by Allen Taflove in a 1980 paper in IEEE Transactions onElectromagnetic Compatibility. The basic FDTD space grid and time-stepping algorithm trace back to a seminal 1966 paper by Kane Yee inIEEE Transactions on Antennas and Propagation.
The resulting finite-difference equations aresolved in either software or hardware in a leapfrog manner: the electric field vector components in a volume ofspace are solved at a given instant in time then the magnetic field vector components in the same spatialvolume are solved at the next instant in time and the process is repeated over and over again until the desiredtransient or steady-state electromagnetic field behavior is fully evolved. The time-dependent Maxwell's equations (in partial differential form) are discretized using central-difference approximations to the space and time partial derivatives. The FDTD method belongs in the general class of grid-based differential time-domain numerical modelingmethods. Since it is a time-domain method, solutionscan cover a wide frequency range with a single simulation run. It isconsidered easy to understand and easy to implement in software. Finite-difference time-domain (FDTD) is a popular computational electrodynamics modeling technique.
0 kommentar(er)
