Interaction Analysis of Micro Bubbles in the Flat Plate to Reduce Drag using Computational Fluid Dynamic

Abstract

Ship transportation has become one of the world's main commodities. There are many ways to improve the efficiency of sea transportation, one of them by reducing the resistance on the hull of the ship. The ship drag reduction technique that will be investigated in this experiment is the bubble drag reduction technique. In this simulation, microbubble injection analysis will be carried out to find the flow efficiency on the flat plate in the numerical calculation of ANSYS FLUENT. The equation that will be used in this simulation is Navier Stokes Equation and the method that will be used is Volume of Fluid where the dimensions of the geometry are 90mm x 10mm with the injection bubble located on a flat plate wall with a distance of 30mm from the x-axis. The variations carried out are variations in bubble injection speed of 0m/s, 10.9m/s, 21.8m/s, 32.7m/s. Then 10 points will be given with a distance of 0.003mm from the plate wall to determine the fluid flow velocity and determine the efficiency of each flow. Efficiency from each simulation is 87.06%, 88.16%, 90.5%, 84.41%. There is an increase in flow efficiency with the help of micro bubble injection at speeds of 10.9 m/s and 21.8 m/s, respectively, an increase in efficiency of 1.1% and 3.44% which results in the highest efficiency in this simulation. Turbulence resulting from bubble injection starts to appear at a speed of 32.7 m/s thereby reducing the flow velocity and making the efficiency decrease by 2.6%. The flow efficiency increases with the injection of micro bubbles and has the highest value at a speed of 21.8 m/s then the efficiency begins to decrease at a speed of 32.8 m/s due to turbulence.