Large-Eddy Simulation of Thermal Mixing in a T-Junction With Conjugate Heat Transfer
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
O1-1 Thermalhydraulics and Structural Integrity in Connection to Aging and Life Extension

David Kloeren (Institute for Nuclear Technology and Energy Systems (IKE))
Eckart Laurien (Institute for Nuclear Technology and Energy Systems (IKE))


Analyzing thermal fatigue due to thermal mixing in T-junctions is part of the safety assessment of nuclear power plants. Results of two large-eddy simulations of mixing flow in a T-junction with coupled and adiabatic boundary condition are presented and compared. The temperature difference is set to 100 K, which leads to strong stratification of the flow. The main and the branch pipe intersect horizontally in this simulation. The flow is characterized by steady wavy pattern of stratification and temperature distribution. The coupled solution approach shows highly reduced temperature fluctuations in the near wall region due to thermal inertia of the wall. A conjugate heat transfer approach is necessary in order to simulate unsteady heat transfer accurately for large inlet temperature differences.

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