ANALYSIS AND REDUCTION OF CAVITATION EFFECT ON SUBMERGED HYDROFOILS

ANALYSIS AND REDUCTION OF CAVITATION EFFECT ON SUBMERGED HYDROFOILS

Mrs. Rohini D, Ms. Madhumitha D, Mr. Karthik K, Mr. Sathis Kumar A

Department of Aeronautical engineering & Bannari Amman Institute of Technology

Abstract: Cavitation is a significant issue for the maritime sector. It has an impact on how well ships operate. The investigation of cavitation in 2D and 3D hydrofoils is the focus of this project (NACA 0015). The volume fraction of vapour reaches a value of 1 with the aid of an appendage (artificial portion above the surface), and a density decrease happens close to the surface. The result of this was a decrease in the rupture stress, bubble collapsing rate, and cavity formation size. Nonetheless, it results in a tiny increase in drag force numbers. This technique allowed for the control of erosion rate. The need determines the hydrofoil to be used. Using computational fluid dynamics, the procedure is carried out for totally turbulent flow (CFD). The grid independent study's mesh count was chosen. The chosen hydrofoil (NACA 0015) is analyzed over using pressure-based and multiphase functions in FLUENT Version 15 at a depth of 12.5 m. The drag curves and density contours are examined for three different cavitation numbers (0.5, 0.45, and 0.4), velocities (29.13 m/s, 31 m/s, and 33 m/s), and Reynolds numbers (37.32 x 10, 39.72 x 10°, and 42.3 x 10"). The appendage findings and the values of drag forces produced from the analysis (6290.7202, 9140.3964, and 16931.562) (14887.848, 13592.145 and 16955.367). The outcome of cavitation reduction is contrasted with the prior outcome. There is a comparison of the outcomes.