Fluent analysis of a ROSA cold leg stratification test

Computational fluid dynamics study of pressurized thermal shock phenomena in the reactor pressure vessel

“…The results showed general good agreement; however, mixing effects were more predominant in the experiment than in the simulation results which were attributed to geometrical obstacles not taken into account in the calculations. Similar conclusions were achieved earlier by Farkas and Toth (2010) regarding the performance of the turbulence models and discrepancies with the experimental data.…”

Review of audit calculation activities on the applicability of CFD software to nuclear safety problems

“…In addition, flow vibration may cause thermal stresses in the surrounding structures, which reduce the life of the reactor vessel. Because of this importance, the effect of PTS has been actively studied either experimentally or numerically [5]. Among these, the ROSA project [6,7] undertaken by the OECD/NEA includes six types of the separate or the integral effect tests.…”

Transient computational fluid dynamics analysis of emergency core cooling injection at natural circulation conditions

“…The complete length of the downcomer was modelled to avoid feedback of boundary conditions on the flow in the section of interest. Following recommendations of Farkas et al (2008), a rounded transition with a radius of 19 mm was used to connect the cold legs and the downcomer. The boundary conditions were specified at the cold legs directly after the primary coolant pumps, at the ECC lines, and at the lower part of the downcomer as shown in Fig.…”