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Locally mesh-refined lattice Boltzmann method for thermal convective flows

Onodera, Naoyuki   ; Idomura, Yasuhiro   ; Ali, Y.*; Shimokawabe, Takashi*

A thermal flow analysis is one of important topics for decommissioning the TEPCO's Fukushima Daiichi Nuclear Power Station. Japan Atomic Energy Agency (JAEA) has been evaluating the air cooling performance of the fuel debris by using the JUPITER code, which is based on an incompressible fluid model on uniform Cartesian grids. However, the JUPITER code requires a large computational cost to capture complicated debris' structures at the actual scale. To accelerate such air cooling analyses, we use the CityLBM code, which is developed using a locally mesh refined lattice Boltzmann method (LBM) and is highly optimized for GPUs. The CityLBM code is validated against free convective heat transfer experiments at JAEA.

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