Abo Bibliothek: Guest
Ninth International Symposium on Turbulence and Shear Flow Phenomena
June 30 - July 3, 2015, University of Melbourne, Australia

DOI: 10.1615/TSFP9

SENSOR-BASED ESTIMATION OF THE VELOCITY IN THE HIGHLY MODULATED WAKE OF A WALL-MOUNTED PYRAMID

pages 685-690
DOI: 10.1615/TSFP9.1150
Get accessGet access

ABSTRAKT

A methodology for improved sensor-based velocity field estimation from experimental data in bluff-body wakes is presented and illustrated for the turbulent wake of a wall-mounted square-base pyramid. The sensors monitor the local surface pressure, while the velocity field is measured with planar, time-resolved stereoscopic PIV. Starting from the extended proper orthogonal decomposition technique, key improvements of the spatio-temporal resolution of the strongly modulated shedding include: (1) exploiting the guaranteed orthogonality of the velocity expansion modes; (2) using explicit modal cross-correlations between velocity and pressure fields; (3) determining objectively sensorsignal time delays; and (4) benefiting from symmetry considerations. Combined, these filtering operations yield a near-optimal estimation from surface pressure signals. It is shown that the mean-field paraboloid is better rendered and the residual of the estimated coherent kinetic energy is 30% - 50% smaller than with previously proposed estimation methods.

Digitales Portal Digitale Bibliothek eBooks Zeitschriften Referenzen und Berichte Forschungssammlungen Preise und Aborichtlinien Begell House Kontakt Language English 中文 Русский Português German French Spain