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One of the bottle-necks of the large-scale FDTD calculation is the data I/O. Although PFS improves the I/O performance it is not always available. Under the computational environment without PVFS and local disks for each PE, limitation on the number of nodes which can produce the output data improves the scalability. HDF5 is compared with the ASCII format and the binary formats from the perspective...
The modelling of media with high relative permittivity requires a spatial resolution finer than the one imposed by geometrical constraints. Such materials can be modelled efficiently in subgridding schemes. The ability of 1D HSG-FDTD to handle high meshing ratio allows the successful numerical modelling of a human body. This is the first step towards 3D modelling. Future work will target the efficient...
This paper proposes the methodology to introduce the ability to deal with the frequency dependent materials to the most promising subgridding technique, HSG scheme, based on the first order Debye model for UWB systems. The numerical experiments have proved that the signals propagate through the subgridding without reflection, signals in the non-working region did not leak into the working region and...
Parallel FD-FDTD method is proposed. Different parallelisation techniques are approached to deal with the large scale computation. Performance measurements indicate that using MPI for shared memory parallelism provides performance benefits for this particular problem. Even if MPI introduces some overhead in data communication, the fact that most of the runtime occurs in calculations and not in communication...
This paper first reviews the implementation of FD-FDTD applying the first order Debye model for UWB systems. Based on the well-known solution for a dipole in free space for continuous wave, the analytical solution for the dipole as a soft source in the frequency dependent media is proposed. The analytical solution is used in proposing the method for the accuracy assessment of soft sources utilising...
This paper proposes a procedure to calculate the local propagation speed of a spherical wave UWB signal for the assessment of numerical noise in a limited FDTD space. This method overcomes the theoretical deficiency of phase and group velocities which assumes the plane wave monochromatic signal propagation. The proposed method can estimate the local signal velocity to any propagation directions in...
The frequency dependent alternating direction-implicit finite difference time domain (FD-ADI-FDTD) method is designed to handle FD materials and there is to date no study of the influence of FD materials on the complex frequency-shifted perfectly matched layer (CFS-PML) parameters. This paper studies the effects of the CFS-PML parameters on the reflection coefficient with regard to the FD media parameters
This paper proposes a numerical technique to calculate the local propagation velocity of a spherical wave UWB signal in a limited FDTD space. This method can calculate the velocity at any point to any propagation directions. Meaningful results can be obtained from the method using even a limited number of grid cells which can be accommodated by a single standard desktop machine. This velocity is a...
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