Singularities in the EM fields are addressed. The hybrid method is also applied to simulateĬontrolled-source EM data in the frame of both total-field and primary-secondary fieldĪpproaches, in which the problems in dealing with singular source functions that cause discontinuous electric fields across the conductivityĬontrasts, is achieved by proposing a hybrid meshfree scheme which is a modification Faithful reproduction of the physics in the EM fields, e.g. Three benchmark conductivity models from the literature. The meshfree method is then applied toįorward model magnetotelluric data of which the effectiveness is demonstrated using TheĬomputational efficiency of the meshfree method is compared with that of using a The convergence and accuracy of the proposed RBF-FD method areĭemonstrated first via forward modelling gravity and gravity gradient data. The computation isįurther accelerated by introducing a new type of radial basis function in the RBFFD Used in the computation for the first time for EM problems. To improve numerical efficiency, unstructured point sets are Using only a set of unconnected points, effectively overcoming the issues related to In the meshfree method, the physical model is represented Radial basis function-based finite difference (RBF-FD), a meshfree method, in forward In this thesis I investigate the feasibility and applicability of So for EM inversion computations in which the forward modelling may be
Generation process may become computationally expensive and unstable, and particularly Generating 3-D unstructured meshes conforming to irregular geometries. Methods that are capable of using such meshes have inherent drawbacks caused by Meshes in the discretization of an Earth model. The most successful way to incorporate them is to use unstructured Requires numerical algorithms that can incorporate realistically complex geometryĪnd topography. Simulating geophysical electromagnetic (EM) data over real-life conductivity models Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Forward modelling 3-D geophysical electromagnetic field data with meshfree methods.ĭoctoral (PhD) thesis, Memorial University of Newfoundland.Īvailable under License - The author retains copyright ownership and moral rights in this thesis.
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