Sarigiguzel, F.Kilavuz, A.Ozgoren, M.Durhasan, T.Sahin, B.Kavurmacioglu, L. A.Akilli, H.2025-01-062025-01-0620220029-80181873-525810.1016/j.oceaneng.2022.1111742-s2.0-85128176631https://doi.org/10.1016/j.oceaneng.2022.111174https://hdl.handle.net/20.500.14669/2448In this study, the free-surface effect in the wake region of a torpedo-like geometry having a cambered nose was investigated experimentally via Particle Image Velocimetry (PIV) and dye flow visualization methods. The Reynolds number was taken as Re = 2 x 10(4) and 4 x 10(4) while keeping the angle of attack (alpha = 0 degrees). The torpedo-like geometry is submerged at various positions from the free-surface in the range of 0.50 <= h/D <= 3.50 in which (h) is the distance from the water free-surface to the central plane of the geometry, and D is the diameter of the midsection of the torpedo-like geometry. The effect of the free-surface of water on the flow properties is also measured and presented comparatively in terms of normalized contours of instantaneous vorticity, time-averaged streamwise velocity, vorticity contours, Reynolds stress correlation, turbulent kinetic energy, velocity fluctuations in streamwise and cross-streamwise, vortex shedding frequency, spectral density distribution as well as pointwise variation. It is observed that the flow structures become asymmetric when the body is located near the free-surface for the submersion ratio of h/D <= 1.0. With the largest submersion ratio of h/D = 3.50, the flow characteristics are almost identical and symmetrical on both sides of the geometry.eninfo:eu-repo/semantics/closedAccessFree-surfacePIVTorpedo-like geometryTurbulent flowVorticityArticleQ1253WOS:000806780700001Q1