scholarly journals Visualization of Sound Source in Turbulence by the Time-Resolved Stereoscopic PIV

2007 ◽  
Vol 27 (Supplement2) ◽  
pp. 135-136 ◽  
Author(s):  
Koichi OBANA ◽  
Mamoru TANAHASHI ◽  
Toshio MIYAUCHI
Keyword(s):  
Sound Source ◽  
Time Resolved ◽  
Stereoscopic Piv

1712 Sound Source Investigation in Turbulence by the Time-Resolved Stereoscopic PIV

2007 ◽  
Vol 2007.7 (0) ◽  
pp. 143-144
Author(s):  
Koichi OBANA ◽  
Mamoru TANAHASHI ◽  
Toshio MIYAUCHI
Keyword(s):  
Sound Source ◽  
Time Resolved ◽  
Stereoscopic Piv

scholarly journals E214 Development of Time-Resolved Dual-Plane Stereoscopic PIV

2006 ◽  
Vol 2006 (0) ◽  
pp. 351-352
Author(s):  
Tetsu Hirayama ◽  
Mamoru Tanahashi ◽  
Toshio Miyauchi
Keyword(s):  
Time Resolved ◽  
Stereoscopic Piv ◽  
Dual Plane

scholarly journals 3D pressure field reconstruction from time-resolved stereoscopic PIV measurements by relaxation of Taylor's hypothesis

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Dominique Fratantonio ◽  
John James Charonko
Keyword(s):  
Pressure Field ◽  
National Laboratory ◽  
Reconstruction Algorithm ◽  
Turbulent Channel Flow ◽  
Reconstruction Method ◽  
Time Resolved ◽  
Material Derivative ◽  
Stereoscopic Piv ◽  
Air Jet ◽  
Taylor’S Hypothesis

This work presents reconstructions of 3D pressure fields starting from 2D3C stereoscopic-PIV (SPIV) measurements. In Fratantonio et al. (2021), we presented a new reconstruction algorithm, the “Instantaneous convection” method, capable of producing 3D velocity fields from time-resolved SPIV measurements. For reconstructions in flows with strong shear layers and high turbulence intensity, this method is able to provide time-resolved 3D velocity volumes that are more accurate than those that can be obtained from the more frequently employed reconstruction method based on the Taylor’s hypothesis and on the use of a mean convective field. Here we investigate the possibility of reconstructing the 3D pressure field from the timeresolved series of reconstructed 3D velocity data. A pseudo-tracking method is employed for computing the velocity material derivative, and the pressure field is then reconstructed by solving the 3D Poisson equation. The velocity and pressure reconstructions are validated on the Direct Numerical Simulation data of the turbulent channel flow taken from the John Hopkins Turbulence Database (JHTDB), and an application to experimental SPIV measurements of an air jet flow in coflow carried out at the Turbulent Mixing Tunnel (TMT) facility at Los Alamos National Laboratory is presented.

Turbulence Measurements by Time-Resolved Stereoscopic PIV

2005 ◽  
Vol 25 (96) ◽  
pp. 8-13_1 ◽  
Author(s):  
Mamoru TANAHASHI ◽  
Gyoung-Min CHOI ◽  
Masayuki ITAKURA ◽  
Toshio MIYAUCHI
Keyword(s):  
Time Resolved ◽  
Stereoscopic Piv ◽  
Turbulence Measurements

A time-resolved estimate of the turbulence and sound source mechanisms in a subsonic jet flow

2007 ◽  
Vol 8 ◽  
pp. N7 ◽  
Author(s):  
C. E. Tinney ◽  
P. Jordan ◽  
A. M. Hall ◽  
J. Delville ◽  
M. N. Glauser
Keyword(s):  
Sound Source ◽  
Jet Flow ◽  
Time Resolved ◽  
Source Mechanisms ◽  
Subsonic Jet

Microtubule nucleation sequence studied by time-resolved x-ray scattering and electron microscopy

1983 ◽  
Vol 41 ◽  
pp. 766-767
Author(s):  
Eva-Maria Mandelkow ◽  
Eckhard Mandelkow ◽  
Joan Bordas
Keyword(s):  
Electron Microscopy ◽  
Dynamic Equilibrium ◽  
Time Resolved ◽  
X Ray ◽  
Additional Information ◽  
X Ray Scattering ◽  
Low Concentrations ◽  
Microtubule Growth ◽  
Ray Patterns ◽  
Ray Scattering

When a solution of microtubule protein is changed from non-polymerising to polymerising conditions (e.g. by temperature jump or mixing with GTP) there is a series of structural transitions preceding microtubule growth. These have been detected by time-resolved X-ray scattering using synchrotron radiation, and they may be classified into pre-nucleation and nucleation events. X-ray patterns are good indicators for the average behavior of the particles in solution, but they are difficult to interpret unless additional information on their structure is available. We therefore studied the assembly process by electron microscopy under conditions approaching those of the X-ray experiment. There are two difficulties in the EM approach: One is that the particles important for assembly are usually small and not very regular and therefore tend to be overlooked. Secondly EM specimens require low concentrations which favor disassembly of the particles one wants to observe since there is a dynamic equilibrium between polymers and subunits.

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