(0000) Instability issues in the server room cooling system

Tomasz Kwiatkowski


Since 2009, the National Centre for Nuclear Research in Poland has been constructing its own High Performance Computing (HPC) Centre under the name Świerk Computing Centre (CIŚ). Now, it is ready reaching its target - 1 PFLOPS - in December 2015. However at the early operation stage, one of its major problems was the unstable work of HPC cluster cooling system, resulting in the increase of the maintenance costs. The main aim of this work is to thoroughly investigate the origin of the problem and to find the best solution for it basing on the results from Computational Fluid Dynamics (CFD) analysis. The constructors suspected that the oscillations in the flow domain are caused by the thermal flow stratification, but something else was proved. In this paper, wide range of cases will be analysed, covering different work regimes of the installation as well as various geometry modifications. Finally, certain improvement to the current design will be suggested by the CFD Analysis Group.


HPC, computer cluster, efficient cooling, CFD

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