Using domain decomposition techniques for the calculation of low‐frequency electric current densities in high‐resolution 3D human anatomy models

Abstract

Purpose -Improved numerical calculation techniques for low-frequency current density distributions within high-resolution anatomy models caused by ambient electric or magnetic fields or direct contact to potential drops using the finite integration technique (FIT). Design/methodology/approach -The methodology of calculating low-frequency electromagnetic fields within high-resolution anatomy models using the FIT is extended by a local grid refinement scheme using a non-matching-grid formulation domain. Furthermore, distributed computing techniques are presented. Several numerical examples are analyzed using these techniques. Findings -Numerical simulations of low-frequency current density distributions may now be performed with a higher accuracy due to an increased local grid resolution in the areas of interest in the human body voxel models when using the presented techniques. Originality/value -The local subgridding approach is introduced to reduce the number of unknowns in the very large-scale linear algebraic systems of equations that have to be solved and thus to reduce the required computational time and memory resources. The use of distributed computation techniques such as, e.g. the use of a parallel solver package as PETSc follows the same goals.

Towards real-time magnetic dosimetry simulations for inductive charging systems

“…As the human model consists of voxels, the MQS exposure simulation method of choice is the SPFD scheme (Dawson et al , 1996), (Dawson and Stuchly, 1996), which has been formulated in terms of the Finite Integration Technique (FIT) (Weiland, 1996) in (Barchanski et al , 2005). To use any MQS/eddy current solver, the Co-Simulation SPFD scheme is used (Zang et al , 2017a).…”

Towards Real-Time Magnetic Dosimetry Simulations for Inductive Charging Systems

“…As the human model consists of voxels, the MQS exposure simulation method of choice is the SPFD scheme [7], [8], which has been formulated in terms of the Finite Integration Technique (FIT) [9] in [10]. To use any MQS/eddy current solver, the Co-Simulation SPFD scheme is used [2].…”

Practical Electromagnetic Modeling Methods

“…One such model is shown in Figure 2, together with its coronal and sagittal sectional views. 8 Once the geometric model of a human body is constructed, one needs to specify the electromagnetic properties for each tissue. Without a reasonably accurate specification of the electromagnetic properties of the tissues, the geometric model is practically useless.…”