Immersed Solid linked to Rigid Body Solver Query

Minty688 · July 24, 2015, 08:57

Hello All!

I come to humbly ask for some assistance in this issue I have come across.

Simply put I have a ball passing through a gradual 90 degree elbow pipe, and I am using Ansys CFX. The expectation is for the ball to bump against the wall of the pipe on its way through but to remain inside the fluid domain.

The ball itself is a domain on its own set as an immersed solid linked to a rigid body solver. Standard inlet and opening conditions on the two ends of the pipe, default wall conditions elsewhere. With this I end up having the ball start moving along the pipe as expected until it reaches the bend where it passes through the wall and off into space.

I have tried fiddling with different settings put to no avail. Does anyone know what I might be doing wrong or have you got a method for doing this problem yourself?

Best Wishes,
Minty

singer1812 · July 24, 2015, 12:00

CFX doesnt have wall to wall interference built in.

ghorrocks · July 24, 2015, 21:51

You could either do this as a FSI model with ANSYS mechanical's contact model or if your boundary is simple you might be able to define some CEL expressions to prescribe the wall locations and influence the rigid body velocity.

Minty688 · July 28, 2015, 07:47

Quote:

Originally Posted by ghorrocks

You could either do this as a FSI model with ANSYS mechanical's contact model or if your boundary is simple you might be able to define some CEL expressions to prescribe the wall locations and influence the rigid body velocity.

Thanks Ghorrocks, I'll give that a go.

July 24, 2015, 08:57	Immersed Solid linked to Rigid Body Solver Query	#1
Minty688 New Member Gavin Join Date: Mar 2015 Posts: 5 Rep Power: 11	Hello All! I come to humbly ask for some assistance in this issue I have come across. Simply put I have a ball passing through a gradual 90 degree elbow pipe, and I am using Ansys CFX. The expectation is for the ball to bump against the wall of the pipe on its way through but to remain inside the fluid domain. The ball itself is a domain on its own set as an immersed solid linked to a rigid body solver. Standard inlet and opening conditions on the two ends of the pipe, default wall conditions elsewhere. With this I end up having the ball start moving along the pipe as expected until it reaches the bend where it passes through the wall and off into space. I have tried fiddling with different settings put to no avail. Does anyone know what I might be doing wrong or have you got a method for doing this problem yourself? Best Wishes, Minty

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July 24, 2015, 12:00		#2
singer1812 Senior Member Edmund Singer P.E. Join Date: Aug 2010 Location: Minneapolis, MN Posts: 511 Rep Power: 21	CFX doesnt have wall to wall interference built in.

July 24, 2015, 21:51		#3
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	You could either do this as a FSI model with ANSYS mechanical's contact model or if your boundary is simple you might be able to define some CEL expressions to prescribe the wall locations and influence the rigid body velocity.