Local Scouring around Multiple Large Circular Cylinders

Local Scouring around a Circular Pier in Open Channel

Local scour around a cylindrical pier in a channel with an erodible bed or natural bed is a common problems in bridge or pile supported structure. The highly unsteady complex flow field around a circular pier produces scour hole mainly for the presence of vortices. The main mechanism that drives the formation and evolution of the scour hole around bridge pier is horse shoe vortex motion. In the...

Parallel 3D Computation of Unsteady Flows Around Circular Cylinders

Digital-Finite Difference Method and its Application to 2D Simulations of Flow around Three Circular Cylinders

In this article we propose a numerical method using pixels in a digital image and show a numerical simulation for an incompressible viscous flow around three circular cylinders. The characteristic we present here combines the digital image, the fictitious domain and the finite difference method. Since the digital image consists of so many pixels and each of pixels forms a small square, the fini...

Numerical simulation of three-dimensional flow around two circular cylinders in tandem arrangement

Three-dimensional fluid flow around two circular cylinders in tandem arrangement is computed by the finite difference method without a turbulence model. The overlapped grid technique is employed to catch the flow interference between the two tandem cylinders. It is confirmed that the abrupt numerical change of drag coefficients and the Strouhal number is in good agreement with the previous expe...

Wake transition in the flow around two circular cylinders in staggered arrangements

The wake transition of the flow around two circular cylinders placed in staggered arrangements with fixed streamwise separation of 5D and cross stream separation varying from 0D to 3D has been studied. The wake transition is compared to that of a single isolated cylinder. Linear stability analysis utilising Floquet theory and direct numerical simulations, using the spectral/hp element method we...