Flow Modeling in Various Cylindrical Surfaces

Abstract

The proper and clear understanding of aerodynamics on different bodies such as aeroplanes, ships, automobiles, turbines and propeller's blades, tall towers, hydraulic structures, buildings etc. are of great importance in technology and betterment of day to day affairs. This enables efficient, economical and improved designs. The proper shaping of the automobiles results in increases speed at low fuel consumption with ease of comfort. Flow past a stationary circular cylinder at Reynolds number is studied numerically using Navier-Stokes equation and solved via finite volume method. Numerical explanations are compared with experimental results and with research works of other investigators. Different flow occurrences such as drag, pressure distribution over the surface of cylinder, flow separation etc. are also calculated at different boundary conditions. In this paper the comparison between the smooth and rough surface cylinders as well as effect of surface roughness and the nature of pressure distribution are widely studied by numerical simulation by using CFD (Computational Fluid Dynamics) software namely ANSYS-fluent. Here the Large Eddy Simulation (LES) turbulence model is used for numerical simulation. The present work is the result of extensive numerical calculation on cylindrical bodies with varying cylinder diameters, surface roughness and various air velocities. The variables include cylinders of three different diameters such as 15mm, 20mm and 25mm and having surface roughness 325 micron, 260 micron. Flow velocity of airflow bench varies from 26.50m/s to 23.41m/s are used for numerical analysis.