Stratified spin-up in a sliced, square cylinder

Sliced cylinder results: phenomenology and code validation

This chapter provides an overview of the flow in the sliced cylinder under various conditions, and compares the numerical output with laboratory results and the linear theory by Beardsley (1969) in order to verify the accuracy of the numerical model. This chapter is based on results presented by Griffiths & Kiss (1999) (hereafter GK99); Griffiths was responsible for all the laboratory results a...

Dynamics of a tilted cylinder wake in a stratified fluid

Despite the large amount of research devoted to bluff body wakes [1], very few studies have focused on stratified wakes despite their obvious applications to geophysical flows. Moreover, most of these studies have studied the turbulent regime in the wake of a sphere or an ellipsoid [2,3], due to its naval applications for submarine wakes. These bluff bodies have a finite height, which leads to ...

Zoology of Unstable Modes in a Stratified Cylinder Wake

This paper delineates experimental and numerical results concerning the effect of the stratification and the tilt on the 3D instabilities of a cylinder wake led at moderate Reynolds numbers from the 2D von Karman vortex street. For a vertical cylinder, shadowgraph visualisations put forward an unstable mode similar to the mode A well known in homogeneous fluids. When the cylinder is tilted a ne...

Magnetic Properties in a Spin-1 Random Transverse Ising Model on Square Lattice

In this paper we investigate the effect of a random transverse field, distributed according to a trimodal distribution, on the phase diagram and magnetic properties of a two-dimensional lattice (square with z=4),  ferromagnetic Ising system consisting of magnetic atoms with spin-1. This study is done using the effectivefield theory (EFT) with correlations method. The equations are derived using...

Three-dimensional instabilities of a stratified cylinder wake