Scale resolved simulations of the OECD/NEA–Vattenfall T-junction benchmark

摘要: Abstract Mixing of fluids in T-junction geometries is significant interest for nuclear safety research. The most prominent example the thermal striping phenomena piping T-junctions, where hot and cold streams join turbulently mix, however not completely or immediately at T-junction. This result temperature fluctuations near wall, either side secondary pipe branch opposite main pipe. wall fluctuation can cause cyclical stresses subsequently fatigue cracking wall. Thermal mixing a has been studied validation CFD-calculations. A test was carried out Alvkarleby Laboratory Vattenfall Research Development (VRD) Sweden. Data from this have reserved specifically OECD CFD benchmark exercise. computational results show that RANS fail to predict realistic between fluids. were significantly better with scale-resolving methods such as LES, showing fairly good predictions velocity field mean temperatures. calculation predicts also similar frequencies observed model test.