Numerical study of external air flow over stationary nd rotating pipe with Eliiptical cross-section

Abstract

Papers presented to the 11th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 20-23 July 2015.A two dimensional time dependent computational model is developed to simulate and investigate the fluid flow across a pipe with elliptical cross section for two cases: when the pipe is stationary and when it has a rotational motion. Air flow over the duct with various low Reynolds numbers (Four values in the range of Re=1 to Re=1000) is considered. Momentum equations with proper boundary conditions are solved using dynamic mesh. Streamlines, Pressure distribution and Velocity profiles are obtained and creation of vortices, boundary layers, separation region, wake region, reattachment point and stagnation points are studied in detail as well as the lift and drag coefficients as a function of time and the results are compared for the two cases.