Numerical simulation of a buoyant heated air jet in large containment vessel CIGMA with outer surface cooling

Hamdani, A.  ; Abe, Satoshi  ; Ishigaki, Masahiro ; Shibamoto, Yasuteru ; Yonomoto, Taisuke 

Gas density stratification build-up and its propagation/erosion, which is regarded as a benchmark of hydrogen behavior in a severe accident, were experimentally and numerically studied by using buoyant jet in the containment vessel. The experiments were conducted with external surface cooling and high-temperature air-jet inlet up to 435 degrees Celcius. The CFD simulation was also performed, and the data on temperature and velocity profile were used for the validation.