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Modeling momentum and scalar transport in a wall-bounded turbulent flow

Saxton-Fox, Theresa and McKeon, Beverley (2017) Modeling momentum and scalar transport in a wall-bounded turbulent flow. In: 10th International Symposium on Turbulence and Shear Flow Phenomena (TSFP10), July 6-9, 2017, Chicago, IL.

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A mildly-heated turbulent boundary layer was studied to characterize the relationship between velocity structures and the scalar field. Particle image velocimetry (PIV) and a Malley probe (Malley et al., 1992) were used to simultaneously measure the velocity field and the streamwise gradients of the scalar field (Gordeyev et al., 2014) respectively. Two distinct velocity scales were identified to be correlated to scalar mixing by conditionally averaging the velocity field on the existence of a scalar gradient. Resolvent analysis was used to create simple models of these velocity scales (McKeon and Sharma, 2010) and to probe their interaction. Using a combination of structural conditional averaging and conditional averaging on the scalar gradient, significant interaction was observed between the two scales of interest, with behavior consistent with the general scale interaction described by amplitude modulation (Hutchins and Marusic, 2007). The study constructed a model of the velocity field that was correlated to streamwise scalar gradients in the outer boundary layer.

Item Type:Conference or Workshop Item (Paper)
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URLURL TypeDescription paper entry of TSFP10, vol. 2
Saxton-Fox, Theresa0000-0003-1328-4148
Additional Information:Conference presentation, session 4C-2. The authors would like to acknowledge the support of the Air Force, which made this work possible through a National Defense Science and Engineering Graduate Fellowship and two grants overseen by Doug Smith, #FA9550-12-1-0060 and #FA9550-16-1-0361. Additionally, the authors thank Dr. Scott Dawson for his assistance with the resolvent code in the boundary layer geometry.
Funding AgencyGrant Number
National Defense Science and Engineering Graduate Fellowship (NDSEG)UNSPECIFIED
Air Force Office of Scientific Research (AFOSR)FA9550-12-1-0060
Air Force Office of Scientific Research (AFOSR)FA9550-16-1-0361
Record Number:CaltechAUTHORS:20171128-103322689
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:83505
Deposited By: Katherine Johnson
Deposited On:28 Nov 2017 18:56
Last Modified:03 Oct 2019 19:07

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