On the role played by turbulence closures in hull shape optimization at model and full scale |
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Authors: | Régis Duvigneau Michel Visonneau Gan Bo Deng |
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Institution: | (1) Laboratoire de Mécanique des Fluides, Ecole Centrale de Nantes, 44321 Nantes, France, FR |
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Abstract: | The practical use of automated computational fluid dynamics (CFD)-based design tools in the ship-building industry requires
powerful flow solvers which are able to take into account realistic geometries as well as complex physical phenomena, such
as turbulence. A shape optimization tool is developed in this framework. A derivative-free optimizer, yielding both flexibility
and robustness, is preferred to the classical gradient-based method, which is more difficult to implement and is still limited
to only moderately complex problems. The flow solver included in the design procedure solves the incompressible Reynolds-averaged
Navier–Stokes equations on unstructured grids using a finite-volume formulation involving several near-wall low-Reynolds-number
turbulence models. The design tool is used to optimize the stern of a modern hull shape at model and full scale, with different
purposes being considered. More precisely, the drag reduction and the homogenization of the flow in the wake are expected
by controlling the longitudinal vortex generated. Our interest is particularly focused on the influence of turbulence modeling
in the design process. The effects of a two-equation model based on the eddy-viscosity assumption and a second-order closure
relying on the Reynolds stress transport equations are compared.
Received: September 24, 2002 / Accepted: April 14, 2003
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Acknowledgment. The authors thank the scientific committee of CINES (project dmn2050) for the attribution of CPU time. |
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Keywords: | Navier– Stokes Turbulence Shape optimization Hull shape |
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