Print Email Facebook Twitter A sensitivity analysis of CFD transition modelling in the context of vortex roll-up prediction Title A sensitivity analysis of CFD transition modelling in the context of vortex roll-up prediction Author Liebrand, Rens (Student TU Delft) Klapwijk, M.D. (TU Delft Ship Hydromechanics and Structures; Maritime Research Institute Netherlands (MARIN)) Lloyd, Thomas (Lisbon Technical University) Vaz, Guilherme (Lisbon Technical University) Lopes, Rui (Maritime Research Institute Netherlands (MARIN); Lisbon Technical University) Contributor Bensow, Rickard (editor) Ringsberg, Jonas (editor) Date 2019 Abstract A sensitivity analysis of the transitional flow over a NACA662 - 415 foil and the elliptical Arndt wing is carried out. The SST turbulence model is complemented with the ? - Re ~?t transition model to determine the effect of varying turbulence intensity and eddy-viscosity ratio on the integral quantities and transition locations. Local grid refinement at the transition location is used to improve convergence. The skin friction drag coefficient is found to be more sensitive to the inflow conditions for 5? angle of attack compared to 9?. The movement of the transition location on the suction side is found to be responsible for this. The transition model captures a laminar separation bubble at the pressure side for both angles of attack, causing the lift coefficient to drop slightly. 3D calculations for the Arndt wing with the same foil section show that applying a transition model can decrease the boundary layer thickness by a factor of three, which is expected to influence the viscous core radius and consequently the minimum pressure in the tip vortex. Subject Cavitating tip vortex noiseElliptical wingReFRESCOTransition modelling To reference this document use: http://resolver.tudelft.nl/uuid:976417a3-fa4a-4ee3-8da1-ec89785ed0d4 Publisher International Center for Numerical Methods in Engineering, Barcelona ISBN 978-84-949194-3-5 Source 8th International Conference on Computational Methods in Marine Engineering, MARINE 2019 Event 8th International Conference on Computational Methods in Marine Engineering, MARINE 2019, 2019-05-13 → 2019-05-15, Gothenburg, Sweden Part of collection Institutional Repository Document type conference paper Rights © 2019 Rens Liebrand, M.D. Klapwijk, Thomas Lloyd, Guilherme Vaz, Rui Lopes Files PDF KLapwijk_EbookMarine2019.pdf 1.57 MB Close viewer /islandora/object/uuid:976417a3-fa4a-4ee3-8da1-ec89785ed0d4/datastream/OBJ/view