Decay of the drag wake of a sphere at Reynolds number $$10^5$$
Tóm tắt
The drag wake of a dimpled sphere with $$Re = 10^5$$ is studied experimentally using Stereo Particle Image Velocimetry to a downstream distance of $$\sim 90$$ diameters. The wake growth and velocity decay are analyzed and compared with previous dimpled sphere data for $$Re = 5 \cdot 10^4$$ . Self-similar decay was observed with the ensemble mean axial velocity defect decaying as $$x^{-1}$$ and the wake size growing as $$x^{1/2}$$ . Due to the difference in Reynolds number, the two spheres have different drag coefficients (0.13 and 0.25, respectively), but these self-similar decay exponents were not observed to depend on drag coefficient or Reynolds number. The results suggest that the self-similar drag wake decay observed at laboratory scales may extrapolate to the larger Reynolds numbers typical of engineering and geophysical flows.
Tài liệu tham khảo
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UVMAT Particle Image velocimetry program (2018)
http://servforge.legi.grenoble-inp.fr/projects/soft-uvmat