@inbook{9af7de1e47a84da8b4822feda2cb0554,
title = "Fracture assessment of reactor circuit (FRAS): Simulation of thermal striping in a HDR experiment",
abstract = "Computational Fluid Dynamics (CFD) calculations of thermal striping in a HDR (Hei{\ss}dampfreaktor) experiment were performed with the commercial Star-CD code. In the experiment, temperature fluctuations caused by instability between layers of cold and hot water flowing in a horizontal pipe were studied. Large-Eddy Simulation (LES) with the Smagorinsky sub-grid scale model was mainly used for turbulence modelling. The vortex method was implemented and validated for simple pipe flow in order to have realistic turbulent inlet conditions for LES. Different geometries and meshes for simulating the experiment were tested. Results obtained with realistic geometry seemed qualitatively correct but the magnitude of temperature fluctuations was too low. This could be connected to too coarse mesh in the model.",
author = "Antti Timperi",
year = "2009",
language = "English",
isbn = "978-951-38-7266-3",
series = "VTT Tiedotteita - Research Notes",
publisher = "VTT Technical Research Centre of Finland",
number = "2466",
pages = "395--402",
booktitle = "SAFIR2010: The Finnish Research Programme on Nuclear Power Plant Safety 2007-2010",
address = "Finland",
}