meshing a golf ball

krish997 · June 26, 2018, 15:03

In meshing a 2d golf ball I can't use both refinement and inflation in one mesh.
If I use refinement of 3rd level, I am getting a converged solution with less drag.but in controverse I use inflation the iteration goes on, and the drag sees to raise tremendously. kindly help me.

JBeilke · June 28, 2018, 09:55

There is no way to represent a sphere in 2d. Or do you think that a cylinder is more or less the same as a sphere?

krish997 · June 28, 2018, 14:22

yeah, I guess 2d model requires less time and it is a major cross-section of the sphere.

JBeilke · July 1, 2018, 16:14

At least you are not alone with this misconception. There is a whole nation using a cylinder like object and calls it football.

arjun · July 1, 2018, 20:20

Quote:

Originally Posted by krish997

In meshing a 2d golf ball I can't use both refinement and inflation in one mesh.
If I use refinement of 3rd level, I am getting a converged solution with less drag.but in controverse I use inflation the iteration goes on, and the drag sees to raise tremendously. kindly help me.

As someone who has worked 8 years with golf ball simulations, here is my advice.

1. It is extremely 3d simulation.

2. The best solutions with traditional solver were obtained with kinetic Energy based LES model.

3. We ended up our own LES DNS code for it.

Here is a hint from one of the simulation university did for us as part of joint work.

https://www.youtube.com/watch?v=LvVuuaqCC7A&t=4s

Good luck.

krish997 · July 5, 2018, 13:15

Ok, I am doing with 3d, but I have a problem with hard points as it is not supported in 3d inflation then how to have a perfect meshing.

FMDenaro · July 5, 2018, 13:31

Quote:

Originally Posted by krish997

Ok, I am doing with 3d, but I have a problem with hard points as it is not supported in 3d inflation then how to have a perfect meshing.

you can also try to mesh only a part of the sphere and then replicate to cover all the geometry.

JBeilke · July 5, 2018, 13:49

You might have a look into GridPro , when you are seriously interested in this topic.

Airfoil wake capturing

http://blog.gridpro.com/the-art-and-...hing-airfoils/

There is also a nice article here:

https://community.plm.automation.sie...ck/ba-p/504353

krish997 · July 6, 2018, 12:56

Mesh only a part of the sphere and then replicate to cover all the geometry. Bro how can I do that.

krish997 · July 6, 2018, 12:59

I can't do a fine meshing with inflation around the dimples of the golf ball.

krish997 · July 6, 2018, 13:17

Thanks, bro please tell the mesh controls used to have a perfect mesh around a golf ball.

JBeilke · July 6, 2018, 13:36

You should probably tell us, which software you are using :-)

krish997 · July 6, 2018, 13:38

Ansys 15.0

JBeilke · July 6, 2018, 13:54

Quote:

Originally Posted by krish997

Ansys 15.0

No idea, I never used it.

krish997 · July 16, 2018, 12:32

Please tell me, how to have a perfect 3d mesh over a golf ball in Ansys 15.0 for good results. My lap has 8gb ram.please guide me.

June 26, 2018, 15:03	meshing a golf ball	#1
krish997 New Member kish Join Date: Jun 2018 Posts: 8 Rep Power: 7	In meshing a 2d golf ball I can't use both refinement and inflation in one mesh. If I use refinement of 3rd level, I am getting a converged solution with less drag.but in controverse I use inflation the iteration goes on, and the drag sees to raise tremendously. kindly help me.

June 28, 2018, 09:55		#2
JBeilke Senior Member Joern Beilke Join Date: Mar 2009 Location: Dresden Posts: 501 Rep Power: 20	There is no way to represent a sphere in 2d. Or do you think that a cylinder is more or less the same as a sphere? FMDenaro, CeesH and Mrt23 like this.

July 1, 2018, 16:14		#4
JBeilke Senior Member Joern Beilke Join Date: Mar 2009 Location: Dresden Posts: 501 Rep Power: 20	At least you are not alone with this misconception. There is a whole nation using a cylinder like object and calls it football. arjun and FMDenaro like this.

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June 28, 2018, 14:22		#3
krish997 New Member kish Join Date: Jun 2018 Posts: 8 Rep Power: 7	yeah, I guess 2d model requires less time and it is a major cross-section of the sphere.

July 5, 2018, 13:15		#6
krish997 New Member kish Join Date: Jun 2018 Posts: 8 Rep Power: 7	Ok, I am doing with 3d, but I have a problem with hard points as it is not supported in 3d inflation then how to have a perfect meshing.

July 5, 2018, 13:49		#8
JBeilke Senior Member Joern Beilke Join Date: Mar 2009 Location: Dresden Posts: 501 Rep Power: 20	You might have a look into GridPro , when you are seriously interested in this topic. Airfoil wake capturing http://blog.gridpro.com/the-art-and-...hing-airfoils/ There is also a nice article here: https://community.plm.automation.sie...ck/ba-p/504353

July 6, 2018, 12:56		#9
krish997 New Member kish Join Date: Jun 2018 Posts: 8 Rep Power: 7	Mesh only a part of the sphere and then replicate to cover all the geometry. Bro how can I do that.

July 6, 2018, 12:59		#10
krish997 New Member kish Join Date: Jun 2018 Posts: 8 Rep Power: 7	I can't do a fine meshing with inflation around the dimples of the golf ball.

July 6, 2018, 13:17		#11
krish997 New Member kish Join Date: Jun 2018 Posts: 8 Rep Power: 7	Thanks, bro please tell the mesh controls used to have a perfect mesh around a golf ball.

July 6, 2018, 13:36		#12
JBeilke Senior Member Joern Beilke Join Date: Mar 2009 Location: Dresden Posts: 501 Rep Power: 20	You should probably tell us, which software you are using :-)

July 6, 2018, 13:38		#13
krish997 New Member kish Join Date: Jun 2018 Posts: 8 Rep Power: 7	Ansys 15.0

July 16, 2018, 12:32		#15
krish997 New Member kish Join Date: Jun 2018 Posts: 8 Rep Power: 7	Please tell me, how to have a perfect 3d mesh over a golf ball in Ansys 15.0 for good results. My lap has 8gb ram.please guide me.