Radio-Frequency Human Exposure Assessment by Wiart Joe

Author:Wiart, Joe
Language: eng
Format: epub
ISBN: 9781119285151
Publisher: Wiley
Published: 2016-03-03T00:00:00+00:00

2.3.4.2. Sub-gridding

A major drawback of the uniform FDTD is its difficulty in handling geometries that have locally fine structures. A dense mesh is, in this case, required all over the computational domain that can lead to unmanageable problems. For instance, the inner ear grid size must be close to 0.1 mm which in the case of a uniform grid induces extremely large problems. As described previously, a non-uniform grid can be used [WIA 98] to save memory but such an approach does not allow a local refinement of the grid. To alleviate this limitation, large efforts have been carried out in the 1990s to create sub-gridding [OKO 97, WON 03, PAS 07, CHA 99, BON 07]. The main advantage of the sub-gridding method is its ability to locally improve the field resolution, without modifying the rest of the computational domain. Several sub-gridding techniques have been proposed; some of these approaches were based on “interpolation schemes” in space and time with possibly an offset of the local grid [ANQ 09] (see Figure 2.42).

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