Simulating a rotating sphere, with axis of rotation normal to flow direction

gamer_lester · December 16, 2014, 14:18

what I did was set the boundary condition of the sphere wall as a moving wall with rotation and a rotational speed. when I ran the simulation I obtained a drag coefficient that is similar to experimental values, however my lift coefficient is significantly smaller, 10 times smaller. Is there any other setting that i need to do in fluent to make it work?

anbu2cfd · December 17, 2014, 03:35

Reference value tab enter the area of your sphere. hope it helps

gamer_lester · December 19, 2014, 15:47

Actually I did input the area. I eventually managed to find out what the problem was, it was probably due to the low mesh density that I was using since I was restricted to using not more than 500k mesh elements, and having to simulate a 3D football sized sphere, probably is the reason why there was a large error in the lift coefficient.

December 16, 2014, 14:18	Simulating a rotating sphere, with axis of rotation normal to flow direction	#1
gamer_lester New Member Join Date: Dec 2014 Posts: 2 Rep Power: 0	what I did was set the boundary condition of the sphere wall as a moving wall with rotation and a rotational speed. when I ran the simulation I obtained a drag coefficient that is similar to experimental values, however my lift coefficient is significantly smaller, 10 times smaller. Is there any other setting that i need to do in fluent to make it work?

December 17, 2014, 03:35	hi	#2
anbu2cfd New Member anbu Join Date: Mar 2014 Posts: 25 Rep Power: 12	Reference value tab enter the area of your sphere. hope it helps

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Wrong direction of flow!!!	hungnguyen1908	CFX	5	July 19, 2013 09:25
Flow over rotating sphere	csmistry	CFX	3	August 11, 2009 20:07
Rotation flow calc. II. Andy	Christian	Main CFD Forum	2	April 10, 2003 05:06
Inviscid Drag at subsonic, subcritical Mach #	Axel Rohde	Main CFD Forum	1	November 19, 2001 13:19
fluid flow fundas	ram	Main CFD Forum	5	June 17, 2000 22:31

December 19, 2014, 15:47		#3
gamer_lester New Member Join Date: Dec 2014 Posts: 2 Rep Power: 0	Actually I did input the area. I eventually managed to find out what the problem was, it was probably due to the low mesh density that I was using since I was restricted to using not more than 500k mesh elements, and having to simulate a 3D football sized sphere, probably is the reason why there was a large error in the lift coefficient.