Sound radiation by a vortex pair moving near a rectangular cylinder.

Sound Generated by a Pair of Axisymmetric Coaxial Vortex Rings

The time-dependent acoustic field generated by the mutual interaction of a pair of coaxial viscous vortex rings advecting along a common axis of symmetry is simulated using a two-step numerical procedure. In the first step, the flowfield is predicted by solving the incompressible Navier–Stokes equations. In the second step, Powell’s vortex sound theory is used to predict the far-field acoustic ...

Vortex Formation Near an Iris in a Rectangular Waveguide

The generalized dual-series approach to the capacitive and inductive iris waveguide problems is presented. Currents on the iris and plots of the fields and power flow in the vicinity of the iris are given for the capacitive iris case. It is found that vortices form in the iris region when higher order scattered modes are present. The formation of these vortices and their properties will be desc...

Thermal Field Around a Circular Cylinder with Periodic Vortex Shedding

A numerical study is carried out to investigate the laminar forced convection heat transfer from a circular cylinder. The fluid is assumed to be incompressible, the Reynolds number ranged from 0.1 to 1000, and the Prandtl number was equal to 0.7. The range of study includes heat transfer in creeping flow (Re40). The equations were discretized by a control-volume-based finite difference techniqu...

Vortex Dynamics on a Cylinder

Spatially periodic rows of point vortices in a 2-dimensional ideal fluid have long attracted the attention of fluid dynamicists, one of the earliest and the most popular instances being Kármán’s vortex street [6], [15, photos 94–98]. The general problem is as follows: analyse the motion of an infinite configuration consisting of vortices z1, . . . , zN ∈ C with vorticities Γ1, . . . ,ΓN ∈ R tog...

Sound generation by a vortex ring collision