Numerical investigation of the cavitating flow and the cavitation-induced noise around one and two circular cylinders. (1st June 2023)

• Record Type: Journal Article
• Authors: Sadri, Maryam; Kadivar, Ebrahim
• Is Part Of: Ocean engineering. Volume 277(2023)
• Publication Date: 2023-06-01
• Subjects: Hydrodynamic cavitation -- Cavitation-induced noise -- Circular cylinder -- High-order simulation; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2023.114178
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: In this work, we simulated a two-phase cavitating flow around one and two circular cylinders with the density based homogeneous mixture model. We discretized the governing equations with employing a high-order compact finite-difference scheme incorporating filtering scheme to account for the numerical instabilities and physical discontinuities. We applied a shock capturing sensor for discontinuities detection and switching between the second-order and high-order filtering and computed the far-field acoustic by the Ffowcs Williams-Hawkings surface integral method. We studied the flow features in the wake of a circular cylinder and two cylinders for noncavitating regime and cavitating conditions. In addition, we analyzed the cavitating flow for various gaps of two side-by-side cylinders. Results revealed that the shock waves due to the collapse of the cavity moving downstream of the cylinders is the main mechanism for the generation of the acoustic impulses. The results also showed that the noise peak can occur at lower frequencies for the smaller gap between the two cylinders. Furthermore, the wakes behind the side-by-side cylinders were merged together and a single vortex street was generated by the reduction of the gap between two cylinders. Highlights: We simulated cavitating flow around one and two circular cylinders using a high-order simulation. We analyzed the cavitating flow for various gaps of two side-by-side cylinders. A shock capturing sensor for discontinuities detection and switching between the second- and high-order filterings was used. Shock waves due to the collapse of the cavity was the main mechanism for the generation of the acoustic impulses. Wakes behind the side-by-side cylinders were merged together by the reduction of the gap between two cylinders.