Sphere at Re=1e+7

danny9019 · June 13, 2018, 08:05

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-

piu58 · June 15, 2018, 01:10

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.

danny9019 · June 15, 2018, 07:15

ok thanks man

June 13, 2018, 08:05	Sphere at Re=1e+7	#1
danny9019 Member Danny Join Date: Jun 2018 Location: Rome, Italy Posts: 36 Rep Power: 8	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-

June 15, 2018, 01:10		#2
piu58 Senior Member Uwe Pilz Join Date: Feb 2017 Location: Leipzig, Germany Posts: 744 Rep Power: 15	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. __________________ Uwe Pilz -- Die der Hauptbewegung überlagerte Schwankungsbewegung ist in ihren Einzelheiten so hoffnungslos kompliziert, daß ihre theoretische Berechnung aussichtslos erscheint. (Hermann Schlichting, 1950)

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Possible to select Cells next to a SPHERE surface?	keepfit	OpenFOAM	2	November 30, 2016 16:47
[snappyHexMesh] Sphere in a channel by snappyHexMesh	arsalan.dryi	OpenFOAM Meshing & Mesh Conversion	0	November 14, 2016 17:01
free convection around shallow sphere	hamednoordoost@yahoo.com	FLUENT	12	April 4, 2013 03:54
[ICEM] meshing a sphere - large deviation from perfect sphere	murx	ANSYS Meshing & Geometry	25	August 15, 2012 13:37
meshing F1 front wing	Steve	FLUENT	0	April 17, 2003 13:37

June 15, 2018, 07:15		#3
danny9019 Member Danny Join Date: Jun 2018 Location: Rome, Italy Posts: 36 Rep Power: 8	ok thanks man