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INTERNATIONAL JOURNAL OF c 2008 Institute for Scientific NUMERICAL ANALYSIS AND MODELING Computing and Information
 

Summary: INTERNATIONAL JOURNAL OF c 2008 Institute for Scientific
NUMERICAL ANALYSIS AND MODELING Computing and Information
Volume 5, Supp , Pages 1735
MULTISCALE FEATURE DETECTION IN UNSTEADY
SEPARATED FLOWS
GUONING CHEN, ZHONGZANG LIN, DANIEL MORSE, STEPHEN SNIDER,
SOURABH APTE, JAMES LIBURDY, AND EUGENE ZHANG
Abstract. Very complex flow structures occur during separation that can ap-
pear in a wide variety of applications involving flow over a bluff body. This
study examines the ability to detect the dynamic interactions of vortical struc-
tures generated from a Helmholtz instability caused by separation over bluff
bodies at large Reynolds number of approximately 104 based on a cross stream
characteristic length of the geometry. Accordingly, two configurations, a thin
airfoil with flow at an angle of attack of 200 and a square cylinder with nor-
mally incident flow are examined. A time-resolved, three-component PIV data
set is collected in a symmetry plane for the airfoil, whereas direct numerical
simulations are used to obtain flow over the square cylinder. The experimental
data consists of the velocity field, whereas simulations provide both velocity
and pressure-gradient fields. Two different approaches analyzing vector field
and tensor field topologies are considered to identify vortical structures and

  

Source: Apte, Sourabh V. - School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University

 

Collections: Engineering