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Sphere at Re=1e+7

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Old   June 13, 2018, 08:05
Smile Sphere at Re=1e+7
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Danny
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Hi,
i'm trying to simulate a 3D-Sphere in water at Reynolds Number 1e+7 (i.e. 10'000'000) in Star-CCM+, but at the moment i'm not achieving the correct CD result of about 0.19. My physics options are:

Velocity Inlet V = 10.014 m/s
Density rho= 998.6 kg/m3
Sphere Diameter D = 1m
Turbulence Model = K-w
Time = Steady
Fluid Type = Liquid.

The Mesh options on the body are:
Number of Prism Layer = 10
Stretching Factor = 1.5


Can someone please help me?
I really appreciate much.

-Danny-
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Old   June 15, 2018, 01:10
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Uwe Pilz
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There are much publications on spheres or cylinders (2D) in free stream. If you read them and compare the results with the experimental data given by Hermann Schlichting: Nearly no simulation covers such large Re numbers with sufficient accuracy.

Especially the drag crisis (which has a lot of applications, starting form a golf ball) is not captured.
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Die der Hauptbewegung überlagerte Schwankungsbewegung ist in ihren Einzelheiten so hoffnungslos kompliziert, daß ihre theoretische Berechnung aussichtslos erscheint. (Hermann Schlichting, 1950)
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Old   June 15, 2018, 07:15
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ok thanks man
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