Numerical Analysis of Fluid Flow in A Duct Around Perpendicular Cylinder with Triangle Cross Section Obstacle

In this paper the numerical analysis of fluid flow in a duct around a perpendicular cylinder with triangle cross-section obstacle is presented. The analysis is developed for simulating two-dimensional flow around a cylindrical body, using the Navier-Stokes and energy equations. The fluid flow is assumed to be incompressible,steady and laminar with constant thermophysical properties. The conservation form of the equation is employed, in generalized orthogonal curvilinear coordinate, using the covariant component of the velocities. The boundary-fitted coordinate system was used to generate an orthogonal curvilinear coordinate system by numerically solving Poisson equation with orthogonally condition. The governing equations are solved numerically by using a control volume on the staggered grid based on finite difference formulation. The results reveals that a triangle obstacle improve the heat transfer in comparison with heat exchangers without obstacle and besides the upstream location of flow separation and the downstream reattachment lengths are found to depend only on the triangle's angle of attack.