Thermalhydraulics Flows with TransAT- Thermal Stripping-

Sep. 2014ASCOMP www.ascomp.chlakehal@ascomp.ch

LES of Thermal stipping in a T-junction

Flow visualization test in the Vattenfall T-junction test facility (Courtesy from Älvkarleby Laboratory, Vattenfall R&D). • LDV meas. (Westin et al.)• Re = 1.9E5• DT= 15 Deg.

BFC grid (1.600.000 nodes)

LES of Thermal stipping in a T-junction

LES of Thermal stipping in a T-junction

Time signals results

LES of Thermal stipping in a T-junction

• Time-averaged velocities: LES versus experiment

Horizontal profile, L/D=1.6 Horizontal profile, L/D=3.6

Vertical profile, L/D=1.6 Vertical profile, L/D=3.6

LES of Thermal stipping in a T-junction

• Reynolds stresses: LES versus experiment

Horizontal profile, L/D=1.6 Horizontal profile, L/D=3.6

Vertical profile, L/D=1.6 Vertical profile, L/D=3.6

LES of Thermal stipping in a T-junction

• Mean temperatures and RMS temperatures

Angle of 0° (Top of the pipe) Angle of 180° (Bottom of the pipe)

Angle of 90° Angle of 270°

LES of Thermal stipping in a T-junction

LES of Thermal stipping in a channel junction

Schematic diagram of the test channel Hirota et al. (2010)

LES of Thermal stipping in a channel junction

Time average velocity profiles at various locations of the horizontal channel (X/B=0, 1 and 2)

R.M.S. profiles at various locations of the channel (X/B=0, 1 and 2)

Time average and R.M.S. temperature profiles at various locations of the channel (X/B=0, 1 and 2)

LES of Thermal stipping in a channel junction