11:35 AM–1:45 PM, Tuesday, November 20, 2007
Salt Palace Convention Center - 251 E
Chair: Jonathan Naughton, University of Wyoming
Abstract ID: BAPS.2007.DFD.NQ.10
1:32 PM–1:45 PM
Xiaofeng Liu
Joseph Katz
(Johns Hopkins University)
A non-intrusive measurement technique that is capable of simultaneously measuring the instantaneous velocity, material acceleration and pressure distribution over a sample area has been applied to measure the pressure related turbulence statistics of a 2D open cavity flow. This technique utilizes four-exposure PIV to measure the distribution of material acceleration, and integrating it by means of circular virtual boundary omni-directional algorithm to obtain the instantaneous pressure distribution. Results enable direct measurements of components of the pressure-rate-of-strain, pressure diffusion and velocity-pressure-gradient tensors. Analysis of error propagation and comparisons between these terms indicate that the results are reliable. In the cavity shear layer, the pressure-rate-of-strain term R11 is mostly negative while R22 is positive but with smaller magnitude, implying that the streamwise turbulent energy is redistributed to the lateral direction. Conventional pressure-strain turbulence models are also compared with the measurement data.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.DFD.NQ.10