The turbulent free-surface flow around the Series 60 ship is computed at model- and full-scale ship Reynolds numbers. The steady RaNS equations are solved using the RaNS solver FINFLO SHIP developed at the Ship Laboratory of Helsinki University of Technology. Turbulence is treated with Chien’s low-Reynolds number k-ε turbulence model. Incompressibility of the flow is taken into account by an artifical compressibility approach. The entire boundary layer is resolved till the wall. The nondimensional distance of the first node from the wall is about 2. The free-surface is evaluated using a moving-grid technique and regridding. The validation is carried out using experimental results for the resistance and the wave profile obtained at model scale. Further, the wave profiles at the hull are compared with the solution of a potential-flow computation. The results for the wave profile are in good agreement with the experiment and the potential-flow solution. At full scale, the stern wave is little higher than at model scale, which is physically correct, indicating a slight scale effect. The resistance is evaluated with an accuracy of about 4 percent at model scale and full scale. The measured result is extrapolated to the respective Reynolds numbers using the ITTC-57 method. The significance of computations and validation at full scale is discussed. The results shown demonstrate that free-surface computations of turbulent ship flows around simple geometries are possible at full-scale ship Reynolds numbers using the moving-grid technique and no wall functions.


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    Title :

    Numerische Untersuchung der turbulenten Strömung mit Wellenbildung um das Series 60-Schiff bei Reynoldschen Zahlen der Modell- und Großausführung


    Contributors:

    Published in:

    Publication date :

    2006-01-01


    Size :

    10 pages





    Type of media :

    Article/Chapter (Book)


    Type of material :

    Electronic Resource


    Language :

    English