A multi-scale homogenization and reconstruction approach for solid material temperature calculations in prismatic high temperature reactor cores

Multiscale analysis of heat transfer in coated fuel particle compacts – Application to the HTTR

“…It can also be used as an accurate micro-scale model for core-scale safely models as in Ivor Clifford et al (2013). …”

“…The homogenization theory, or multiple-scales analysis, may also be used to provide a consistent analysis of macro-and micro-scales phenomena (Auriault and Royer, 1993;Boutin, 1995;Mei and Vernescu, 2010;Matine et al, 2013;Ivor Clifford et al, 2013).…”

GeN-Foam: a novel OpenFOAM® based multi-physics solver for 2D/3D transient analysis of nuclear reactors

“…The resulting equations of mass, momentum and energy conservation are (Clifford, 2013;Saurel and Abgrall, 1999;Vafai, 2005):…”

“…An additional problem is that the interfacial pressure p i needs to be modeled. A standard assumption (Clifford, 2013;Saurel and Abgrall, 1999) is that p i equals p, which changes Eq. (2) into:…”

“…Typically the coupling is achieved through data exchange interfaces that exchange the most relevant information at each time step. This explicit exchange of information does not usually consistently resolve the system non-linearities, resulting in inaccuracies or requiring the use of extremely short time steps in order to achieve stable and analysis of very high temperature reactors (Clifford, 2013;Clifford et al, 2013). The need of accurate or more detailed simulations has also been favoring a modernization of the tools used by the LWR (light water reactors) industry, as witnessed by the CASL initiative (CASL, 2011) and the MOOSE project (Gaston et al, 2009) in the US, as well as by the NURESAFE project in EU (NURESAFE, 2013).…”