Joint probability densities and quadrant contributions in a heated turbulent round jet
Abstract
Conditional (turbulent) isodensity contours and cross sections of the joint probability density functions of the axial and radial velocity fluctuations, and temperature fluctuation are presented at three radial positions of a slightly heated turbulent round jet. These positions correspond respectively to the axis of the jet, the position where the production of turbulent energy is maximum, and a position where the flow is strongly intermittent. A detailed comparison with appropriate bivariate Gaussian density functions shows that departures from Gaussianity are only slight on the axis, but increase significantly with increasing radial distance. Gaussian estimates for occupancy times and quadrant contributions are good in regions where the flow is nearly fully turbulent, and poor in regions where the flow is strongly intermittent, even when conditionally turbulent quantities are considered.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 July 1977
 Bibcode:
 1977STIN...7823386S
 Keywords:

 Flow Distribution;
 Probability Density Functions;
 Quadrants;
 Turbulent Flow;
 Axial Flow;
 Normal Density Functions;
 Radial Flow;
 Temperature Profiles;
 Velocity Distribution;
 Fluid Mechanics and Heat Transfer