Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 13, 2020 - September 16, 2020
Hydrogen energy is expected to be put to practical use, and it is very important to understand hydrogen gas diffusion behavior and ensure safety when hydrogen gas pipelines are damaged. Therefore, assuming hydrogen gas leakage due to damage to a buried pipeline, hydrogen gas diffusion behavior in the ground and in the atmosphere near the ground surface was investigated by full-scale experiments and CFD simulations. In this paper, validation results of the CFD simulations by comparison with the experiments were shown. Reasonable CFD simulation results were obtained without using any special physical model by setting proper geological parameters such as soil porosity, gas permeability, and effective gas diffusion coefficient in porous media at constant leakage hydrogen gas flow rates. The influence of the geological parameters on the hydrogen gas diffusion behavior was investigated by sensitivity analysis. It was confirmed that fluctuations of the geological parameters had an effect of up to about 20%.
