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Numerical Simulation of Laminar-Turbulent Transition on a Dolphin Using the γ-Re θ Model

In: High Performance Computing in Science and Engineering '11

Author

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  • D. Riedeberger

    (Universität Stuttgart, Institut für Aerodynamik und Gasdynamik)

  • U. Rist

    (Universität Stuttgart, Institut für Aerodynamik und Gasdynamik)

Abstract

The γ-Re θ -model, a two equation, correlation-based transition model using local variables, has been employed to predict the extension of the laminar regions on a stiff geometry of the common dolphin (delphinus delphis) moving in the Reynolds regime of 5.5⋅105 to 107. Mesh independence was gained for a domain resolution of approximately 30 million cells in an unstructured polyhedral mesh with a prismatic wall region (y +≈1). The final results conclude with very limited laminar regions and thus a mainly turbulent flow around the body of a dolphin traveling at the usual speed of 3 m/s and a resulting drag coefficient of C D ≈0.004 referring to the wetted surface area of A=1.571 m2. Consequently the potential for active laminarization due to the anisotropic structure of the dolphin skin is well established and is estimated to be as high as 20% with respect to drag force reduction.

Suggested Citation

  • D. Riedeberger & U. Rist, 2012. "Numerical Simulation of Laminar-Turbulent Transition on a Dolphin Using the γ-Re θ Model," Springer Books, in: Wolfgang E. Nagel & Dietmar B. Kröner & Michael M. Resch (ed.), High Performance Computing in Science and Engineering '11, edition 127, pages 379-391, Springer.
    • Handle: RePEc:spr:sprchp:978-3-642-23869-7_28
    DOI: 10.1007/978-3-642-23869-7_28
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