Two-dimensional numerical investigations have been carried out to study the behavior of unsteady wake for flow past an inline arrangement of square cylinders confined in a channel. The present work aims to study the influence of the... more
Two-dimensional numerical investigations have been carried out to study the behavior of unsteady wake for flow past an inline arrangement of square cylinders confined in a channel. The present work aims to study the influence of the relative size and arrangement of the two cylinders on vortex shedding characteristics in their wakes. A computational code has been developed using finite difference approach based on modified MAC algorithm for solution of governing flow equations. Effect of size ratio of the two cylinders, the cylinder spacing in streamwise direction and flow Reynolds number on the wake flow characteristics of the two cylinders have been presented. The temporal characteristics of the wake are analyzed using time series analysis. Results indicate that for a given Reynolds number, there exist a range of values of size ratio and cylinder spacing for which vortex shedding can occur in the wake of the upstream cylinder.
Numerical investigations are carried out to study the effect of tube separation on flow and heat transfer characteristics for flow past circular tube bundles confined within a rectangular channel. The tube separation has been varied for... more
Numerical investigations are carried out to study the effect of tube separation on flow and heat transfer characteristics for flow past circular tube bundles confined within a rectangular channel. The tube separation has been varied for cross flow of air past inline and staggered arrangements of tubes in such a way that in staggered arrangement, center of an upstream tube and centers of two respective downstream tubes from an equilateral triangle. A three-dimensional computational code based on SIMPLE method using finite volume technique has been developed to solve the governing equations. A body-fitted structured grid has been generated for discretization of the incompressible form of conservation equations of mass, momentum and energy. The flow and heat transfer characteristics for different values of tube separation have been compared using streamline plots, temperature contours, span-averaged pressure drop along length of the channel and span-averaged Nusselt number variation near heated/cooled surfaces.
Keywords: tube separation; tube banks; channel confinement; flow and heat transfer characteristics; finite volume method
