Three-dimensional magnetic resonance velocimetry measurements of turbulence quantities in complex flow
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A magnetic resonance velocimetry (MRV) experimental technique based on magnetic resonance imaging and capable of measuring the turbulent Reynolds stresses in a 3D flow domain is described. Results are presented in backward facing step flow in a square channel with a Reynolds number of 48,000 based on step height and freestream velocity at the step. MRV results are compared to particle image velocimetry (PIV) measurements in the centerplane containing the streamwise and cross-stream axes. MRV and PIV mean velocity measurements show excellent agreement. MRV measurements for Reynolds normal stresses compare to within ±20% of the PIV results while results for the turbulent shear are less accurate.
KeywordsParticle Image Velocimetry Shear Layer Particle Image Velocimetry Measurement Step Height Separate Shear Layer
Christopher J. Elkins and John Eaton were supported by a grant from General Electric Aircraft Engines as part of the GE-University Strategic Alliance and a grant from the National Science Foundation (NSF CTS-0432478). Marcus Alley was supported by the same NSF grant and a grant from the National Institutes of Health (P41 RR09784).
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