In the current work, flow characteristics of single isothermal and non-isothermal jets discharging into upper plenum a 1/16th scaled-down high-temperature gas-cooled reactor (HTGR) facility were studied. ANSYS Fluent simulations carried out in central plane jet water for different Reynolds numbers (Re) ranging from 3413 to 12,819. Then, statistical characteristics, such as mean velocity, root-m...