On spectral linear stochastic estimation

An extension to classical stochastic estimation techniques is presented, following the formulations of Ewing and Citriniti (1999), whereby spectral based estimation coefficients are derived from the cross spectral relationship between unconditional and conditional events. This is essential where acc...

Full description

Saved in:
Bibliographic Details
Published in:Experiments in fluids 2006-11, Vol.41 (5), p.763-775
Main Authors: TINNEY, C. E, COIFFET, F, DELVILLE, J, HALL, A. M, JORDAN, P, GLAUSER, M. N
Format: Article
Language:English
Subjects:
Coherence
Compressible flows
shock and detonation phenomena
Computational fluid dynamics
Estimates
Exact sciences and technology
Fluid dynamics
Fluid mechanics
Fundamental areas of phenomenology (including applications)
General subsonic flows
Instrumentation for fluid dynamics
Jets
Marine
Mathematical models
Mechanics
Physics
Spectra
Stems
Stochasticity
Turbulence
Turbulent flows, convection, and heat transfer
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:An extension to classical stochastic estimation techniques is presented, following the formulations of Ewing and Citriniti (1999), whereby spectral based estimation coefficients are derived from the cross spectral relationship between unconditional and conditional events. This is essential where accurate modeling using conditional estimation techniques are considered. The necessity for this approach stems from instances where the conditional estimates are generated from unconditional sources that do not share the same grid subset, or possess different spectral behaviors than the conditional events. In order to filter out incoherent noise from coherent sources, the coherence spectra is employed, and the spectral estimation coefficients are only determined when a threshold value is achieved. A demonstration of the technique is performed using surveys of the dynamic pressure field surrounding a Mach 0.30 and 0.60 axisymmetric jet as the unconditional events, to estimate a combination of turbulent velocity and turbulent pressure signatures as the conditional events. The estimation of the turbulent velocity shows the persistence of compact counter-rotating eddies that grow with quasi-periodic spacing as they convect downstream. These events eventually extend radially past the jet axis where the potential core is known to collapse.
ISSN:0723-4864
1432-1114
DOI:10.1007/s00348-006-0199-5