Abstract
Comparison between experimental and numerical results of the cavitating vortex shedding behind a square cylinder is presented. The side length of the experimental and numerical model was 25 mm and 20 mm, respectively. The water velocity in the 0.2x0.05 m test section of the channel was varied between 1 and 12 m/s resulting in a Reynolds number range of (0.4-3.5)x10^5. In the simulation the mean velocity was increased up to 14 m/s with 1 m/s increment. Dominant frequencies and Strouhal numbers are reported from cavitation-free flow (classical von Karman vortex shedding) up to supercavitation as a function of the free-stream Reynolds number. It was found that between the inception of cavitation and the formation of supercavitation the Strouhal number is not affected by cavitation. The results are in a fairly good agreement with the literature.
Highlights
Cavitation is known as a destructive phenomenon and its avoidance in hydraulic machinery is of essential interest in engineering
The measurements were performed at different sample rates (600 Hz, 1200 Hz, 2400 Hz) but the higher sample rates did not yield any additional information, the sample rate 600 Hz was used in later experiments
5 Conclusion Unsteady cavitating vortex shedding was studied at high Reynolds numbers (> 5 × 104) behind square cylinders
Summary
Cavitation is known as a destructive phenomenon and its avoidance in hydraulic machinery is of essential interest in engineering. Keywords cavitation · cavitation channel · vortex shedding · measurement · CFX simulation · square cylinder Kim [14] performed large eddy simulation for a square cylinder at Re = 3000 with blockage ratios 0% and 20%.
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