Applications of the adaptive meshing method in the whole space transient electromagnetic field

Influence on accuracy and computational complexity of numerical simulation by mesh degree is very important in the whole space transient electromagnetic field. During numerical simulation in the whole space transient electromagnetic field with the abnormal body, as a secondary excitation source, the abnormal body has a greater impact on the transient field. Therefore, according to the relationship of anomalous resistivity and whole space transient electromagnetic response, and the definition of numerical simulation using different mesh size, the adaptive meshing method in anomalous body region is proposed. The numerical simulation of finite difference in time domain method based on the adaptive meshing method in the whole space with the abnormal body and half space mode is carried out. The results show that the method is accurate and valid from the definition and accuracy, and is suitable for the finite difference calculation of the whole space transient electromagnetic field.