The charge simulation method (CSM) is a well-established numerical technique employed in electrostatic field calculations

primarily due to its simplicity and computational efficiency. However

conventional CSM face challenges when applied to complex geometries

as they necessitate meticulous manual placement of simulation charges and matching points. In this paper

we propose an enhanced CSM that incorporates mesh-based approaches to automate the generation of simulation charges and matching points. By utilising structured or unstructured meshes

the proposed mesh-based CSM (MCSM) is capable of handling intricate geometries. Numerical experiments validate the increased versatility of the method in comparison to traditional CSM techniques. Furthermore

the efficacy of the proposed method is demonstrated through its application to the calculation of total electric fields surrounding high-voltage direct current (HVDC) transmission lines in the presence of nearby buildings. These results underscore the potential of the improved CSM to expand its range of practical applications

thereby enhancing its utility in practice.