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TECHNICAL PAPERS

Natural and Forced Conjugate Heat Transfer in Complex Geometries on Cartesian Adapted Grids

[+] Author and Article Information
Gianluca Iaccarino

Center for Turbulence Research, Stanford University, CA 94305-3030

Stéphane Moreau

 Valeo Motors and Actuators, 1, rue Tiron, Paris, 75004, France101615.1771@compuserve.com

J. Fluids Eng 128(4), 838-846 (Dec 06, 2005) (9 pages) doi:10.1115/1.2201625 History: Received August 31, 2004; Revised December 06, 2005

The Cartesian incompressible RANS solver with immersed boundaries, IBRANS , recently developed at Stanford, has been extended to include conjugate heat transfer modeling and used for the simulation of the electrical motor of an automotive engine cooling fan system. Such applications are particularly challenging, as they involve very complex geometries with tight tolerances and rotating parts. The new conjugate heat transfer capability of IBRANS has been verified on natural and forced convection flows. The former involves flows in enclosures around a sphere and electronic chips. The latter focuses on heated cylinders for Reynolds numbers covering flow regimes ranging for a steady laminar flow to unsteady turbulent flows. Excellent agreement is achieved with similar simulations with a conventional body-fitted solver (FLUENT 6.1 ) using equivalent turbulent models. First three-dimensional simulations of the flow and heat transfer within the complete electrical motor are presented. The numerical predictions of the pressure drop through the motor as a function of flow rate agree very well with the measured data over the complete operating range.

Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Automotive engine cooling electrical motor

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Figure 2

Anisotropic grid refinement

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Figure 3

Cartesian grid planes through the electrical motor

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Figure 4

Heated sphere in enclosure. Topology.

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Figure 5

Heated sphere in enclosure. Grid. Left: body fitted (FLUENT ). Right: IB Cartesian with local grid refinement.

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Figure 6

Heated sphere in enclosure. Temperature contours. Left: body fitted (FLUENT ). Right: IB Cartesian.

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Figure 7

Electronic mold in enclosure. Topology.

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Figure 8

Electronic mold in enclosure. Grid. Left: body fitted (FLUENT ). Right: IB Cartesian with local grid refinement.

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Figure 9

Electronic mold in enclosure. Temperature contours in plane cutting through the cavity. Left: body fitted (FLUENT ). Right: IB Cartesian.

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Figure 10

Electronic mold in enclosure. Temperature contours on mold surface. Left: body fitted (FLUENT ). Right: IB Cartesian.

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Figure 11

Heated cylinder. Grid. Left: body fitted (FLUENT ). Right: IB Cartesian with local grid refinement.

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Figure 12

Heated cylinder Re=23. Temperature contours. Top: body fitted (FLUENT ). Bottom: IB Cartesian.

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Figure 13

Heated cylinder (kf=ks)Re=23. Mid-line velocity and temperature.

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Figure 14

Heated cylinder (kf⪡ks)Re=23. Mid-line velocity and temperature.

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Figure 15

Heated cylinder Re=3900. Lift coefficient.

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Figure 16

IBRANS simulation domain for the electrical motor (blue: wall; grey: EEC motor)

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Figure 17

Velocity contours within the electrical motor

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Figure 18

Test rig for electrical motor’s flow characteristics

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Figure 19

Motor flow characteristics at rest (0rpm)

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