CFD Images

CFD Images

http://people.rit.edu/pnveme/EMEM560n/drag/CFD_Images.html

Pressure Distribution Images The following CFD images were obtained by Professor Kunio Kuwahara, Institute of Space and Astronautical Science , Japan (used here with permission) In them note the stagnation pressure regions, low pressure regions, surface pressure distribution, boundary layer, layer, separation, vortices, and reverse flow

Airfoil:

NACA 0012,

Re = 1000,000

alpha = 10 Flow attached most of the surface. surface. BL thin, Small wake

alpha = 10 Near maximum efficiency, efficiency, Flow mostly attached. Can see two kinds of BL Not much wake region

alpha = 18, Near stall, Flow attached front half. Flow separation at mid chord. chord. Vortices, Significant Significant wake region (more pressure drag)

alpha = 22, Flow stalled. Flow separated on the airfoil Fully separated on the top, Large wake and reverse fl ow

Others

Imagine this dinosaur in a storm (250 mph winds) What kind of drag it would have Laminar separation over a sphere

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18/05/2012 11 34 PM

CFD Images

http://people.rit.edu/pnveme/EMEM560n/drag/CFD_Images.html

Note stagnation point! What do the colors represent

Does this position suggest least drag. Ski jumpers have actually been tested in the wind tunnel

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18/05/2012 11 34 PM