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Electromagnetic method of geoelectrical frequency domain has a wide range of applications in exploring Earth's deep structure, petroleum exploration, environmental and engineering surveying, and its accuracy and efficiency of numerical simulation directly affect the interpretation results of data. However, there are currently issues with low accuracy and long computation time in three-dimensional numerical simulation of frequency domain electromagnetic fields, as well as limitations in computational scale. This paper proposes to use integral equation method and direct solution method to improve the solution accuracy, and adopt technologies such as hybrid parallel processing at multiple levels and multiple grain sizes, distributed storage, etc., to greatly reduce the computation time and expand the computational scale. This paper implements a fast, high-precision, and highly scalable three-dimensional numerical simulation method of frequency domain electromagnetic fields, which includes parallel processing between frequency points, parallel filling of impedance matrix, and parallel direct solution of equations. Firstly, the theoretical framework of integral equation method and its parallel implementation solution are introduced in detail. Then, typical cases are selected to verify the correctness of the program by comparing with previous calculation results. Finally, the scalability is tested for a large-scale example with 16 frequencies, 16×12 495 unknowns, and 861 observation points. Compared to a single node with 32 processes, when the computational scale reaches 256 nodes and 8 192 processes, the speedup ratio is 69.69 and the parallel efficiency is 27.22%. This large-scale parallel algorithm is applicable to both geomagnetic and controlled source audio geomagnetic integral equation methods. [ABSTRACT FROM AUTHOR]

Commercial CFD programs have been widely used in the thermal and hydraulic simulation of reactors, but they cannot fully meet the application requirements of reactors. Open-source CFD programs have some applications, but, compared with commercial CFD programs, there are still gaps on the comprehensive physical model, calculation accuracy, calculation efficiency and ease of use. In order to better meet the needs of thermohydraulics analysis, it needs a more comprehensive physical model, higher calculation accuracy and better parallel computing efficiency, and it is necessary to develop independent thermal CFD software. This paper describes the design, implementation, and test results of YH-ACT: parallel analysis code of thermohydraulics. Three typical cases are selected, and the correctness of the software is verified by comparing it with the simulation results by typical commercial software Fluent. The software parallel computing scale reaches 400 nodes with 9600 processes. The speedup is 111. 7 and the parallel efficiency is 27. 9 % for the steady-state model. The speedup is 37. 2 and the parallel efficiency is 9. 3 % for the transient-state model. [ABSTRACT FROM AUTHOR]