Cylinder

alejandrogra93 · August 15, 2016, 15:45

Hello, I am student and I have to do a simulation about an impulsively started cylinder from the rest. However, I have some doubts about it. I have done a mesh of a cylinder contained in a rectangular mesh so I have 5 boundaries: left, right, top, bottom and cylinder. Moreover, I chose a dynamic mesh in order to have a moving cylinder. I must obtain two vortex behind the cylinder at low Reynolds. However, I obtain them above and below the cylinder, not behind of it. I don't know if the problem may be the boundary conditions. Could you help me, please? Thank you so much.

PD: The solver that I am using is pimpleDyMFoam.

alejandrogra93 · August 16, 2016, 08:12

Someone have a suggestion, please?

CataV · August 28, 2016, 11:00

Hello Alejandro
I'm working with a similar case too. I think that your problem may be related with the boundary conditions. You should attach the U file so I can take a look. Also I want to know if you're using sixDoFRigidBodyDisplacement, just because the constrains conditions can be forced the cylinder to rotate and the vortex shed in other directions

Best regards

August 15, 2016, 15:45	Cylinder	#1
alejandrogra93 New Member Alejandro Join Date: May 2016 Posts: 3 Rep Power: 10	Hello, I am student and I have to do a simulation about an impulsively started cylinder from the rest. However, I have some doubts about it. I have done a mesh of a cylinder contained in a rectangular mesh so I have 5 boundaries: left, right, top, bottom and cylinder. Moreover, I chose a dynamic mesh in order to have a moving cylinder. I must obtain two vortex behind the cylinder at low Reynolds. However, I obtain them above and below the cylinder, not behind of it. I don't know if the problem may be the boundary conditions. Could you help me, please? Thank you so much. PD: The solver that I am using is pimpleDyMFoam. Last edited by alejandrogra93; August 15, 2016 at 19:33.

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August 16, 2016, 08:12		#2
alejandrogra93 New Member Alejandro Join Date: May 2016 Posts: 3 Rep Power: 10	Someone have a suggestion, please?

August 28, 2016, 11:00		#3
CataV New Member Catalina Valencia Join Date: Sep 2015 Posts: 9 Rep Power: 11	Hello Alejandro I'm working with a similar case too. I think that your problem may be related with the boundary conditions. You should attach the U file so I can take a look. Also I want to know if you're using sixDoFRigidBodyDisplacement, just because the constrains conditions can be forced the cylinder to rotate and the vortex shed in other directions Best regards