A large eddy simulation (LES) was applied to predict the unsteady flow in a low-speed axial-flow fan assembly subjected to a highly “turbulent” inflow that is generated by a turbulence grid placed upstream of the impeller. The dynamic Smagorinsky model (DSM) was used as the subgrid scale (SGS) model. A streamwise-upwind finite element method (FEM) with second-order accuracy in both time and space was applied as the discretization method together with a multi-frame of reference dynamic overset grid in order to take into account the effects of the blade-wake interactions. Based on a simple algebraic acoustical model for axial flow fans, the radiated sound power was also predicted by using the computed fluctuations in the blade force. The predicted turbulence intensity and its length scale downstream of the turbulence grid quantitatively agree with the experimental data measured by a hot-wire anemometry. The response of the blade to the inflow turbulence is also well predicted by the present LES in terms of the surface pressure fluctuations near the leading edge of the blade and the resulting sound power level. However, as soon as the effects of the turbulent boundary layer on the blades become important, the prediction tends to become inaccurate.
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e-mail: hauke.reese@uni-siegen.de
e-mail: ckato@iis.u-tokyo.ac.jp
e-mail: thomas.carolus@uni-siegen.de
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March 2007
Technical Papers
Large Eddy Simulation of Acoustical Sources in a Low Pressure Axial-Flow Fan Encountering Highly Turbulent Inflow
Hauke Reese,
Hauke Reese
Ph.D. student
Institute of Fluid- and Thermodynamics,
e-mail: hauke.reese@uni-siegen.de
University of Siegen
, D-57068 Siegen, Germany
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Chisachi Kato,
Chisachi Kato
Professor
Institute of Industrial Science,
e-mail: ckato@iis.u-tokyo.ac.jp
The University of Tokyo
, 4-6-1 Kamaba, Meguro-ku, Tokyo, 153-8505, Japan
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Thomas H. Carolus
Thomas H. Carolus
Professor
Institute of Fluid- and Thermodynamics,
e-mail: thomas.carolus@uni-siegen.de
University of Siegen
, D-57068 Siegen, Germany
Search for other works by this author on:
Hauke Reese
Ph.D. student
Institute of Fluid- and Thermodynamics,
University of Siegen
, D-57068 Siegen, Germanye-mail: hauke.reese@uni-siegen.de
Chisachi Kato
Professor
Institute of Industrial Science,
The University of Tokyo
, 4-6-1 Kamaba, Meguro-ku, Tokyo, 153-8505, Japane-mail: ckato@iis.u-tokyo.ac.jp
Thomas H. Carolus
Professor
Institute of Fluid- and Thermodynamics,
University of Siegen
, D-57068 Siegen, Germanye-mail: thomas.carolus@uni-siegen.de
J. Fluids Eng. Mar 2007, 129(3): 263-272 (10 pages)
Published Online: October 5, 2006
Article history
Received:
October 25, 2005
Revised:
October 5, 2006
Citation
Reese, H., Kato, C., and Carolus, T. H. (October 5, 2006). "Large Eddy Simulation of Acoustical Sources in a Low Pressure Axial-Flow Fan Encountering Highly Turbulent Inflow." ASME. J. Fluids Eng. March 2007; 129(3): 263–272. https://doi.org/10.1115/1.2427077
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