Wavelet analysis methods for radiography of multidimensional growth of planar mixing layers
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
The counter-propagating shear campaign is examining instability growth and its transition to turbulence in the high-energy-density physics regime using a laser-driven counter-propagating flow platform. In these experiments, we observe consistent complex break-up of and structure growth in a tracer layer placed at the shear flow interface during the instability growth phase. We present a wavelet-transform based analysis technique capable of characterizing the scale- and directionality-resolved average intensity perturbations in static radiographs of the experiment. This technique uses the complete spatial information available in each radiograph to describe the structure evolution. We designed this analysis technique to generate a two-dimensional power spectrum for each radiograph from which we can recover information about structure widths, amplitudes, and orientations. The evolution of the distribution of power in the spectra for an experimental series is a potential metric for quantifying the structure size evolution as well as a system’s evolution towards isotropy.
- OSTI ID:
- 22597906
- Journal Information:
- Review of Scientific Instruments, Vol. 87, Issue 7; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
Turbulent mixing and transition criteria of flows induced by hydrodynamic instabilities
|
journal | August 2019 |
Observation and analysis of emergent coherent structures in a high-energy-density shock-driven planar mixing layer experiment
|
journal | August 2016 |
Similar Records
Demonstration of repeatability in a high-energy-density planar shear mixing layer experiment
The Center for Momentum Transport and Flow Organization in Plasmas - Final Scientific Report