A senitivity analysis of CFD transition modelling in the context of vortex roll-up prediction
Document typeConference report
Rights accessOpen Access
Abstract. 415 foil and the elliptical Arndt win e γ R˜eθt 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.
CitationLiebrand, R. [et al.]. A senitivity analysis of CFD transition modelling in the context of vortex roll-up prediction. A: MARINE VIII. "MARINE VIII : proceedings of the VIII International Conference on Computational Methods in Marine Engineering". CIMNE, 2019, p. 465-476. ISBN 978-84-949194-3-5.
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