Simulation of an Air Flow between Cooling Fins
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Helsinki University of Technology |
J Muu elektroninen julkaisu
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2001
Major/Subject
Mcode
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Language
en
Pages
25
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Abstract
Abstract: The flow between the cooling fins of the ABB HXR 400L electric motor was simulated numerically by calculating one fin space and its surroundings. FINFLO flow solver, developed at Helsinki University of Technology, was used in the simulations. For the turbulence modelling k-ω and Chien's low-Reynolds number k-ε models were utilized. Main result: A suitable grid with 605 000 cells was introduced. Turbulence model affected significantly to the computational results. The k-ω model was used as a basic alternative. Results obtained are qualitative, but comparison with measurements is needed. According to the calculations, turbulent viscosity is also created in low-speed areas where one would expect laminar flow. This viscosity is a driving force for the secondary entrainment flow. The k-ε model created large amounts of turbulent viscosity in the secondary flow area, and the resulting flowfield was clearly unphysical.Description
MEMO No CFD/THERMO-38-2001
Date: 2nd October 2001
Keywords
FINFLO, k-ε-model, k-ω-model, cooling fin