Host: The Japan Society of Mechanical Engineers
Name : The 30th International Conference on Nuclear Engineering (ICONE30)
Date : May 21, 2023 - May 26, 2023
In a nuclear accident consequence evaluation, the complex terrain is one of the key factors that affect the simulation result. Increasing the grid resolution of the dispersion model can reproduce more plume details in a scenario with complex terrain, but it will inevitably lead to higher computing costs. Therefore, it is necessary to arrange the grid resolution reasonably according to different regions, so that it can balance the calculation cost and the calculation accuracy.
In this paper, the accuracy of the variable grid and the fixed grid is tested and verified by two experiments, one is a complex terrain simulation experiment and the other is the Kincaid field experiment with flat terrain. The simulation results of the variable grid are evaluated by comparing plume images and statistical results against the fixed grid simulation data and the measurement data. The comparison results show that the variable grid resolution scheme has more plume details in complex terrain scenes than the fixed grid resolution scenario. However, the variable grid resolution scheme does not improve the simulation effect in flat terrain scenario.
