Simulation of an Air Flow between Cooling Fins

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Volume Title

Helsinki University of Technology | J Muu elektroninen julkaisu

Date

2001

Major/Subject

Mcode

Degree programme

Language

en

Pages

25

Series

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

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