The computation of the viscous, incompressible, free-surface flow past a hull at a steady yaw angle is important for the numerical prediction of the hydrodynamic performances of a vessel in manoeuvring. Numerical solutions of the RANS (Reynolds-averaged Navier-Stokes) equations for the steady problem are also relevant in the development of simplified models. Data about the location of separation lines and on the evolution of the wake can be used to calibrate and validate inviscid rotational models, which are present give satisfactory results only when the separation line is known. The specification of these data requires a CFD (Computational Fluid Dynamics) solution unless the boundary layer separation is enforced at a sharp edge. The numerical simulation is not easy. The non-symmetric flow over the hull is fully three-dimensional and highly turbulent. Boundary layer separation and re-attachment often occurs, large wakes and complicated wave pattern are formed. This makes the applicability of the commonly used turbulent models questionable. The steady flow past a ship in straight course with a yaw angle is simulated in a finite volume RANSE solver and validated against models experiments of Longo for a Series 60 hull. The solutions are verified both for global quantities, for which monotonic convergence is obtained on the three finest grids, and for local variables. The results agree well for global coefficients and wave profiles, but the contours of the axial velocity in some cross-planes reveal that some of the details of the measured data are not caught.
Yaw flow simulation for the series 60
Gierströmungssimulation für Schiffsrümpfe von Typ 60
Ship Technology Research / Schiffstechnik ; 46 , 4 ; 223-230
1999
8 Seiten, 9 Bilder, 7 Quellen
Aufsatz (Zeitschrift)
Englisch
Schiffsrumpf , Hydrodynamik , Reynolds-Zahl , Navier-Stokes-Gleichung , Strömungstrennung , rechnerunterstützte Simulation , Rechenmodell , Lösung (Mathematik) , Grenzschicht , turbulente Strömung , Wellenform , Finite-Elemente-Methode , Validierung , Strömungsgeschwindigkeit , numerische Strömungsberechnung , Gierwinkel
Yaw flow simulation for the Series 60
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