Correlation techniques and modal decomposition analysis for the detection of azimuthally coherent structures in jet flows

1979 ◽  
Vol 66 (4) ◽  
pp. 545-555 ◽  
Author(s):  
C.M.T. Bonnet ◽  
M.J. Fisher
Keyword(s):  
Coherent Structures ◽  
Decomposition Analysis ◽  
Jet Flows ◽  
Modal Decomposition ◽  
Correlation Techniques

Modal Decomposition Analysis of Three-Dimensional Transonic Buffet Phenomenon on a Swept Wing

AIAA Journal ◽  
2018 ◽  
Vol 56 (10) ◽  
pp. 3938-3950 ◽  
Author(s):  
Yuya Ohmichi ◽  
Takashi Ishida ◽  
Atsushi Hashimoto
Keyword(s):  
Three Dimensional ◽  
Decomposition Analysis ◽  
Swept Wing ◽  
Modal Decomposition ◽  
Transonic Buffet

Modal decomposition analysis of unsteady viscous liquid sheet flows

2021 ◽  
Vol 33 (9) ◽  
pp. 092117
Author(s):  
Antonio Colanera ◽  
Alessandro Della Pia ◽  
Matteo Chiatto ◽  
Luigi de Luca ◽  
Francesco Grasso
Keyword(s):  
Viscous Liquid ◽  
Decomposition Analysis ◽  
Liquid Sheet ◽  
Modal Decomposition

scholarly journals Characterization of the Unsteady Aerodynamics of Optimized Turbine Blade Tips through Modal Decomposition Analysis

2019 ◽  
Vol 4 (2) ◽  
pp. 12
Author(s):  
Bogdan C. Cernat ◽  
Sergio Lavagnoli
Keyword(s):  
High Performance ◽  
Decomposition Analysis ◽  
Unsteady Aerodynamics ◽  
Tip Leakage Flow ◽  
Modal Decomposition ◽  
Time Resolved ◽  
Leakage Flows ◽  
Numerical Predictions ◽  
Blade Tip ◽  
Generation Mechanisms

The present research focused on the analysis of the leakage flows developing from advanced blade tip geometries. The aerodynamic field of a contoured blade tip and of a high-performance rimmed blade were investigated against a baseline squealer rotor. Time-resolved numerical predictions were combined with high-frequency pressure measurements to characterize the tip leakage flow of each tip design. High spatial and temporal resolution measurements provided a detailed representation of the unsteady flow in the near-tip region and at the stage outlet. Numerical computations, based on the nonlinear harmonic method, were employed to assess the unsteady blade row interactions and identify the loss generation mechanisms depending on the tip design. The space- and time-resolved flow field was analysed by modal decomposition to identify the main periodicities of the near-tip and outlet flow and classify the most relevant sources of aerodynamic unsteadiness and entropy generation across the stage.

Coherent Structures in the Similarity Region of Two-Dimensional Turbulent Jets

1984 ◽  
Vol 106 (2) ◽  
pp. 187-192 ◽  
Author(s):  
J. W. Oler ◽  
V. W. Goldschmidt
Keyword(s):  
Velocity Profile ◽  
Coherent Structures ◽  
Turbulent Jets ◽  
Jet Flows ◽  
Two Dimensional ◽  
Ordered Structure ◽  
Mean Velocity ◽  
The Mean ◽  
Plane Jet ◽  
Average Position

The strongest indication of an ordered structure in the similarity region of plane jet flows is the well documented (but controversial) apparent “flapping” behavior. Previously, the negative correlation between probes placed on opposite sides of the jet centerline has been attributed to the periodic displacement of the mean velocity profile centerline about its average position, i.e., a flapping motion. The present investigation is directed at evaluating the premise of an essentially two-dimensional von Karman vortex street as being responsible for the apparent “flapping” behavior.

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