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.
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Riedeberger, D., Rist, U. (2012). Numerical Simulation of Laminar-Turbulent Transition on a Dolphin Using the γ-Re θ Model. In: Nagel, W., Kröner, D., Resch, M. (eds) High Performance Computing in Science and Engineering '11. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-23869-7_28
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DOI: https://doi.org/10.1007/978-3-642-23869-7_28
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