Body Generated Internal Waves - Unsteady Impulsive Forcing
Abstract
The objective of the GFY16-18 proposed effort is to continue our long term investigation ofbody generated internal waves (IW) by ad"dressing the fundamental processes associated withunsteady, impulsive sources. Of interest are isolated impulsive forcing events, i""n contrast tocontinuous or periodic sources, as they are associated with particular oceanic events such as localinstabilities. The" physical processes associated with unsteady forcing are significantly morecomplex than those associated with steady and/or periodi"c forcing, due to their transient andbroad-band nature.Specifically, this proposed effort will continue the investigation of the g""eneration of internalwaves by an impulsive, turbulent, incoherent source (buoyant plume) and an impulsive coherentsource (vortex r""ing) in a pycnocline, establishing the extent of energy transfer and comparingthese different source mechanisms. This effort will b"e extended to investigate the interaction ofthese impulsive source mechanisms with the free surface. This interaction will be three"dimensionaland will evolve in time and likely will involve nonlinear processes, i.e. nonlinearsurface waves and wave breaking, The" 3D evolution of the plume/ring and the surface wavefieldwill be measured using our newly developed multi-plane scanning PIV system" that records asuccession of sequences of 2D slices through the flowfield, at a speed much greater than the fluidmotion, affording" an instantaneous snapshot that can be reconstructed to provide a sequence of3D images.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- May 05, 2017
- Source ID
- N000141712507
Entities
People
- Alan Brandt
Organizations
- Johns Hopkins University
- Office of Naval Research
- United States Navy