The source Loop Orientation impack on Electromagnetic Field Formation in Anisotropic Medium
The paper considers the interaction of a harmonic electromagnetic field excited by a solenoidal source with a layered anisotropic medium. The source position varies with respect to the day surface. The computational scheme based on the vector finite elements method on the simplex adaptive mesh is implemented in this work. The performed realization allows considering the conductivity of certain subdomains of the computational domain as the second-rank tensor, which reflects the anisotropic behavior of the electromagnetic field during propagating in rocks and soils. The source-loop is introduced into the discrete model of the computational domain at the mesh level, taking into account its geometry. Authors analyze the influence of the field source position on the wave process propagation in the layered medium depending on the conductivity contrast of its layers and the geometry of the media interface on the signal in the receivers and the distribution of the induced non-zero components of the electromagnetic field on the day surface. A conclusion is made about the optimal position of the field source when investigating the subsurface at shallow depths. Parallelization technology with shared memory - OpenMP - is used to accelerate the solution of the finite-element SLAE. The influence of the number of computational processes on the SLAE solution time is investigated.