caa a22 4500 606198172 CHVBK 20210128100932.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s00348-015-1943-5 doi (NATIONALLICENCE)springer-10.1007/s00348-015-1943-5 Experimental investigation on the transition of separation/attachment in steady laminar juncture flows [Elektronische Daten] [Bo Hu, Hua Zhang, Muhammad Younis, Yan Li, Malik Raza] The topological structure and the "separation/attachment” transition of the outermost singular point in steady laminar juncture flows are investigated. The detailed experimentation is conducted using particle-image-velocimetry-based quantitative technique in a water channel. The experimental results reveal that the outermost attachment topology can exist in various horseshoe vortex systems that contain zero to three primary vortices. The parametric study has two major elements: the obstacle bluntness factor and the ratio of the boundary layer thickness to the obstacle width. The outermost topology in the symmetry plane transforms from attachment (half node) to separation (half saddle) as the obstacle bluntness increases or the ratio of the boundary layer thickness to the obstacle width decreases. It is also observed that the flow has a tendency to reattach to the body-fitted surface as it sweeps by the sides of an obstacle, even if the outermost singular point is a separation half saddle in the symmetry plane. Springer-Verlag Berlin Heidelberg, 2015 Hu Bo Ministry-of-Education Key Laboratory of Fluid Mechanics, School of Aeronautical Science and Engineering, Beihang University (BUAA), 100191, Beijing, People's Republic of China aut Zhang Hua Ministry-of-Education Key Laboratory of Fluid Mechanics, School of Aeronautical Science and Engineering, Beihang University (BUAA), 100191, Beijing, People's Republic of China aut Younis Muhammad Ministry-of-Education Key Laboratory of Fluid Mechanics, School of Aeronautical Science and Engineering, Beihang University (BUAA), 100191, Beijing, People's Republic of China aut Li Yan Ministry-of-Education Key Laboratory of Fluid Mechanics, School of Aeronautical Science and Engineering, Beihang University (BUAA), 100191, Beijing, People's Republic of China aut Raza Malik Ministry-of-Education Key Laboratory of Fluid Mechanics, School of Aeronautical Science and Engineering, Beihang University (BUAA), 100191, Beijing, People's Republic of China aut Experiments in Fluids Springer Berlin Heidelberg 56/4(2015-04-01), 1-9 0723-4864 56:4<1 2015 56 348 https://doi.org/10.1007/s00348-015-1943-5 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-015-1943-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hu Bo Ministry-of-Education Key Laboratory of Fluid Mechanics, School of Aeronautical Science and Engineering, Beihang University (BUAA), 100191, Beijing, People's Republic of China aut NATIONALLICENCE 700 1- Zhang Hua Ministry-of-Education Key Laboratory of Fluid Mechanics, School of Aeronautical Science and Engineering, Beihang University (BUAA), 100191, Beijing, People's Republic of China aut NATIONALLICENCE 700 1- Younis Muhammad Ministry-of-Education Key Laboratory of Fluid Mechanics, School of Aeronautical Science and Engineering, Beihang University (BUAA), 100191, Beijing, People's Republic of China aut NATIONALLICENCE 700 1- Li Yan Ministry-of-Education Key Laboratory of Fluid Mechanics, School of Aeronautical Science and Engineering, Beihang University (BUAA), 100191, Beijing, People's Republic of China aut NATIONALLICENCE 700 1- Raza Malik Ministry-of-Education Key Laboratory of Fluid Mechanics, School of Aeronautical Science and Engineering, Beihang University (BUAA), 100191, Beijing, People's Republic of China aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/4(2015-04-01), 1-9 0723-4864 56:4<1 2015 56 348