[Faculty] Fwd: [CSRC-SDSU COLLOQUIUM]: Pressure PIV: An Optics-Based Pressure Measurement Technique and Its Applications

[Jose Castillo]

DATE:  Friday, October 10th, 2014

TITLE:  Pressure PIV: An Optics-Based Pressure Measurement Technique and
Its Applications

TIME:  3:30 PM

LOCATION:  GMCS 214

SPEAKER:  Dr. Xiaofeng Liu. Department of Aerospace Engineering at SDSU

ABSTRACT:  Motivated by the fact that there was a lack of an appropriate
means for measurement of the instantaneous spatial pressure field in fluid
dynamics research, a novel system and technique capable of performing such
a measurement in a non-intrusive manner in turbulent flow fields was
developed (Liu and Katz, Exp Fluids 2006, Phys. Fluids 2008, JFM 2013).
Originally utilizing four-exposure PIV, and later on a time-resolved
version with a high-speed camera and a high repetition rate laser, the
system measures the distribution of material acceleration by comparing the
velocity of the same group of particles at different time, and then
integrates to obtain the pressure field. In order to minimize the error in
the pressure field measurement, an efficient algorithm featuring virtual
boundary omni-directional integration over the entire flow field was
introduced and the corresponding code was developed. With this system, the
instantaneous velocity, material acceleration, and pressure field can be
measured simultaneously. In addition to the principles, procedures and
development history, in this presentation I will also show example
applications of the pressure measurement technique in unsteady fluid
dynamics, acoustics and turbulence research. A central theme of several
research initiatives currently being carried out at SDSU is focused on
establishing a time-resolved 3D velocity and pressure measurement technique
and system, which couples the tomographic PIV together with the extension
of the 2D pressure reconstruction method to 3D. As will be discussed, this
opens up the prospect of direct measurement of all components of the
fluctuating pressure-strain rate tensor in turbulent flows for the first
time, and subsequently enabling experimental data-based improvement in
pressure-strain turbulence models.

HOST:  Dr. Satchi Venkataraman

For future events, please visit our website at:

http://www.csrc.sdsu.edu/colloquium.html


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Jose E. Castillo  Ph.D.

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Computational Science Research Center

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San Diego State University

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619 5947205/3430, Fax 619-594-2459

 http://www.csrc.sdsu.edu/mimetic-book/

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