TY - GEN
T1 - Characteristics of planar counter current shear flow in dump geometry
AU - Kalghatgi, Prasad
AU - Acharya, Sumanta
AU - Strykowski, Paul
AU - Anderson, Matt
PY - 2011
Y1 - 2011
N2 - Countercurrent shear can be used in engineering applications to control flow structure and mixing. In the present paper a planar countercurrent shear flow is studied numerically using Large Eddy Simulation. Mean flow characteristics at a primary-jet Reynolds number of 14700 are studied for three values of a key parameter, the secondary to primary jet mass flow ratio (m s /m p), chosen to match reported measurements. The predicted flow results of time averaged flow field, Strouhal number and turbulence characteristics are compared with the experimentally available data. A change in instability modes is observed at mass flow ratios above m s /m p = 0.27 with more than 100% increase in the turbulence levels and distinct changes in spectral characteristics. Detailed spectral records along with landau modeling are used as evidence of existence of self excited global mode beyond a critical velocity ratio i n the flow.
AB - Countercurrent shear can be used in engineering applications to control flow structure and mixing. In the present paper a planar countercurrent shear flow is studied numerically using Large Eddy Simulation. Mean flow characteristics at a primary-jet Reynolds number of 14700 are studied for three values of a key parameter, the secondary to primary jet mass flow ratio (m s /m p), chosen to match reported measurements. The predicted flow results of time averaged flow field, Strouhal number and turbulence characteristics are compared with the experimentally available data. A change in instability modes is observed at mass flow ratios above m s /m p = 0.27 with more than 100% increase in the turbulence levels and distinct changes in spectral characteristics. Detailed spectral records along with landau modeling are used as evidence of existence of self excited global mode beyond a critical velocity ratio i n the flow.
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U2 - 10.1115/imece2011-63312
DO - 10.1115/imece2011-63312
M3 - Conference contribution
AN - SCOPUS:84869158125
SN - 9780791854877
T3 - ASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011
SP - 109
EP - 119
BT - Advances in Aerospace Technology; Energy Water Nexus; Globalization of Engineering; Posters
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011
Y2 - 11 November 2011 through 17 November 2011
ER -