Page 414 - Thermal Hydraulics Aspects of Liquid Metal Cooled Nuclear Reactors

Multi-scale simulations of liquid metal systems 377

Domain Time
Institution STH CFD scheme scheme References
KTH RELAP5 StarCCM+ Overlapping Implicit Grishchenko
et al. (2015)
GRS, ATHLET ANSYS Decomposition Explicit Papukchiev et al.
TUM CFX (2015)
CEA, CATHARE TrioCFD Overlapping Implicit n.a.
ENEA
SCK CEN RELAP5 ANSYS Decomposition Implicit Toti et al. (2017)
Fluent

As an example, Fig. 7.7 shows the model developed using the CATHARE and
TrioCFD codes. The MATHYS coupling tool overlaps the part of the STH model
describing the 3-D test section with the CFD model using an implicit time scheme.
Specific functions are used to replace the temperatures computed by STH at the cou-
pling boundaries with the boundary values computed by the CFD code, while a source
term in one of the momentum equations in the overlapped domain is used to adjust the
pressure differences between coupling boundaries in the system code.

l The NACIE-UP facility at ENEA Brasimone (Di Piazza et al., 2015) is an LBE loop con-
taining a 19-pin, wire-wrapped subassembly and an argon “gas-lift” section (used to induce
forced convection in the loop) and a heat removal exchanger. Local phenomena in the

Fig. 7.7 CATHARE/TrioCFD model of the TALL-3D facility developed at CEA and ENEA:
CATHARE system model (left) and TrioCFD model of the 3-D test section (right).