The Influence of Velocity Field Estimation on the Prediction of Far-Field Acoustics

2016 ◽  
Author(s):  
Adam Nickels ◽  
Lawrence S. Ukeiley ◽  
Robert W. Reger ◽  
Louis N. Cattafesta
Keyword(s):  
Velocity Field ◽  
Far Field ◽  
Field Estimation

The vortex line in steady, incompressible Oseen flow

2005 ◽  
Vol 462 (2066) ◽  
pp. 391-401 ◽  
Author(s):  
Edmund Chadwick
Keyword(s):  
Velocity Field ◽  
Vortex Line ◽  
Horseshoe Vortex ◽  
Transverse Plane ◽  
Far Field ◽  
Two Dimensional ◽  
Streamwise Direction ◽  
Oseen Flow ◽  
Laminar Wake ◽  
Oseen Vortex

The horseshoe vortex is given in Oseen flow as a constant spanwise distribution of lift Oseenlets. From this, the vortex line is represented in steady, incompressible Oseen flow. The velocity near to the vortex line is determined, as well as near to and far from the far field wake. The velocity field in the transverse plane near to the vortex line is shown to approximate to the two-dimensional Lamb–Oseen vortex, and the velocity field in the streamwise direction is generated by the bound vortex line of the horseshoe vortex giving a streamwise decay much faster than that of the Batchelor vortex. The far field wake description is shown to be consistent with laminar wake theory.

Three-dimensional velocity field estimation of moving cardiac walls

2002 ◽  
Author(s):  
J.M. Gorce ◽  
D. Friboulet ◽  
P. Clarysse ◽  
I.E. Magnin
Keyword(s):  
Velocity Field ◽  
Three Dimensional ◽  
Field Estimation

scholarly journals Fast Far-Field Estimation Method by Compact Single Cut Near-Field Measurements for Electrically Long Antenna Array

2018 ◽  
Vol 66 (11) ◽  
pp. 5859-5868 ◽  
Author(s):  
Yoshiki Sugimoto ◽  
Hiroyuki Arai ◽  
Toshiyuki Maruyama ◽  
Masahiko Nasuno ◽  
Masanobu Hirose ◽  
...  
Keyword(s):  
Antenna Array ◽  
Near Field ◽  
Estimation Method ◽  
Field Measurements ◽  
Far Field ◽  
Field Estimation

Modelling Transport and Dispersion of Effluent Outfalls

1992 ◽  
Vol 25 (9) ◽  
pp. 143-154 ◽  
Author(s):  
A. J. Monteiro ◽  
R. J. Neves ◽  
E. R. Sousa
Keyword(s):  
Velocity Field ◽  
Variable Thickness ◽  
Near Field ◽  
Hydrodynamical Model ◽  
Lagrangian Model ◽  
Far Field ◽  
Initial Thickness ◽  
High Concentration ◽  
Concentration Gradients ◽  
Model Based

The accuracy, applicability and limitations of several kinds of models to simulate the dispersion processes are discussed. An Eulerian-lagrangian model based on the advection of particles is presented. This model is particularly adequate to study plumes with high concentration gradients like those developed by outfall discharges. The model uses the velocity field computed by a 2D depth-integrated hydrodynamical model. The linkage of the near and far field solutions is taken into account using particles of variable thickness. The initial thickness is estimated using an empiric relation for the near field depending on the local discharge conditions. Some results are presented and discussed.

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