Development of Thermohydraulics Computer Programs for Thermal Striping Phenomena

LES benchmark study of high cycle temperature fluctuations caused by thermal striping in a mixing tee

“…Studies of thermal striping were initially carried out for liquid-metal-cooled fast breeder reactor (LMFBR) in the 1980Õs because of the high thermal conductivity of the liquid metal coolant (Muramatsu and Ninikata, 1996). Areas susceptible to thermal striping include components in the core outlet region, such as core upper plenum, flow guide tube, and control rod upper guide tubes.…”

“…There are few studies related to the analytical approach or computer modeling of thermal striping due to the extensive computational capacity required for unsteady, three-dimensional turbulent flow simulations. Thermal striping was modeled previously using LES and DNS (Muramatsu and Ninikata, 1996;Roubin, 1998;Ohtsuka et al, 2003). However, these studies were performed for only a small volume (subdomain) around the mixing zone due to constraints of large computer memory requirements.…”

ICONE19-43460 Large Eddy Simulations on Temperature Fluctuations in Triple-jet Flows with Non-isovelocity Inlet Condition

“…Thermal striping was simulated previously using LES and direct numerical simulation (DNS) (Muramatsu, 1996 andHu, 2006), however, these studies were performed for the mixing zone with a small volume due to the computational constraints. The DNS method requires extreme grid resolution and computational expense that is not viable for realistic geometries.…”

Large-eddy simulations (LES) of temperature fluctuations in a mixing tee with/without a porous medium

“…Research on thermal striping was initially carried out for liquidmetal-cooled fast breeder reactors in the 1980's because of the high thermal conductivity of the liquid metal coolant [4]. Areas susceptible to thermal striping include components in the core outlet region, such as the core upper plenum, flow guide tube, and control rod upper guide tubes.…”

“…Thermal striping was modeled previously using LES and DNS [4,8,11], however, these studies were performed for only a small volume around the mixing zone due to the computational constraints.…”