Raghuraman N Govardhan

Defining the ‘modified Griffin plot’ in vortex-induced vibration: revealing the effect of Reynolds number using controlled damping

In the present work, we study the transverse vortex-induced vibrations of an elastically mounted rigid cylinder in a fluid flow. We employ a technique to accurately control the structural damping, enabling the system to take on both negative and positive damping. This permits a systematic study of the effects of system mass and damping on the peak vibration response. Previous experiments over the last 30 years indicate a large scatter in peak-amplitude data (

Vortex-induced vibrations of a sphere

A^*

Time dependence of effective slip on textured hydrophobic surfaces

) versus the product of mass–damping (

A Stroll down Kármán Street

\alpha

Effect of Pressure Ratio on Bending Mode Flutter in a Transonic Linear Cascade

), in the so-called ‘Griffin plot’.

Particle Image Velocimetry Study of Sonic Jet Injected into Supersonic Crossflow

There are many studies on the vortex-induced vibrations of a cylindrical body, but almost none concerned with such vibrations for a sphere, despite the fact that tethered bodies are a common configuration. In this paper, we study the dynamics of an elastically mounted or tethered sphere in a steady flow, employing displacement, force and vorticity measurements. Within a particular range of flow speeds, where the oscillation frequency (f) is of the order of the static-body vortex shedding frequency

Study of Shock Wave/Turbulent Boundary Layer Interaction over a Forward-Facing Step

f_{vo}

Experimental Study of Supersonic Flow over a forward Facing Step

, there exist two modes of periodic large-amplitude oscillation, defined as modes I and II, separated by a transition regime exhibiting non-periodic vibration. The dominant wake structure for both modes is a chain of streamwise vortex loops on alternating sides of the wake. Further downstream, the heads of the vortex loops pinch off to form a sequence of vortex rings. We employ an analogy with the lift on an aircraft that is associated with its trailing vortex pair (of strength

Vortex-induced vibrations

\Gamma^*

Underwater Sustainability of the ``Cassie'' State of Wetting

and spacing