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DNS of Heat Transfer from a Flat Plate Affected by Free-Stream Fluctuations

In: High Performance Computing in Science and Engineering `07

Author

Listed:
  • Jan.G. Wissink

    (University of Karlsruhe, Institute for Hydromechanics)

  • Wolfgang Rodi

    (University of Karlsruhe, Institute for Hydromechanics)

Abstract

Direct Numerical Simulations (DNS) of heat transfer from a flat plate affected by free-stream fluctuations are performed at three different Reynolds numbers. A contoured upper wall is employed to generate a favourable pressure gradient along a large portion of the flat plate. The free-stream fluctuations stem from a separate LES of isotropic turbulence in a box. In the laminar portions of the accelerating boundary layer flow, the formation of streaks was observed to induce an increase in heat transfer by exchange of hot fluid near the surface of the plate and cold fluid from the free-stream. Compared to the accompanying fully laminar simulations (without free-stream fluctuations), in the simulations with free-stream fluctuations the increase in heat transfer in the fully turbulent part of the boundary layer was found to be significantly larger than the increase in heat transfer induced by the formation of streaks in the laminar part. The computations were carried out on the HP-XC1 cluster in Karlsruhe using up to 64 processors and 137 million grid points.

Suggested Citation

  • Jan.G. Wissink & Wolfgang Rodi, 2008. "DNS of Heat Transfer from a Flat Plate Affected by Free-Stream Fluctuations," Springer Books, in: Wolfgang E. Nagel & Dietmar Kröner & Michael Resch (ed.), High Performance Computing in Science and Engineering `07, pages 293-302, Springer.
    • Handle: RePEc:spr:sprchp:978-3-540-74739-0_20
    DOI: 10.1007/978-3-540-74739-0_20
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