Moving boundary conditions

MC_cfd_engineer · September 30, 2020, 11:34

Hi guys,

I hope someone will help me! I have this problem: I have a tunnel long more or less 100meters and some air inlet points on its wall at a fixed distance. Inside this tunnel, objects moves with constant velocity of about 3 meters per minute.

My idea was to simulate only one part of this tunnel with a fixed position for the body inside and translate the boundary condition in order check the effects of the air inlets on the body.......
Other possibility is to move the body inside the tunnel but it increase critically the number of elements and makes more complicate everything.

Quite complicate but I hope clear.

Anybody have some suggestion?

Thank you in advance,
Matteo

AlexanderZ · October 5, 2020, 01:37

go to boundary conditions, use Moving Wall option for Wall Motion in Momentum tab

MC_cfd_engineer · October 5, 2020, 04:01

Hello,

moving wall is available only for boundary condition wall, so it is not available for inlet boundary conditions..

AlexanderZ · October 6, 2020, 03:37

as far as I undestand, you have inlet in the left (for instance) of domain, top and bottom wall, which represents the tunnel and outlet on the right
so you don't need to apply moving wall to inlet and outlet, apply it to the walls only

September 30, 2020, 11:34	Moving boundary conditions	#1
MC_cfd_engineer New Member Join Date: Aug 2019 Location: Italy Posts: 3 Rep Power: 6	Hi guys, I hope someone will help me! I have this problem: I have a tunnel long more or less 100meters and some air inlet points on its wall at a fixed distance. Inside this tunnel, objects moves with constant velocity of about 3 meters per minute. My idea was to simulate only one part of this tunnel with a fixed position for the body inside and translate the boundary condition in order check the effects of the air inlets on the body....... Other possibility is to move the body inside the tunnel but it increase critically the number of elements and makes more complicate everything. Quite complicate but I hope clear. Anybody have some suggestion? Thank you in advance, Matteo

October 5, 2020, 01:37		#2
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	go to boundary conditions, use Moving Wall option for Wall Motion in Momentum tab __________________ best regards ****************************** press LIKE if this message was helpful

October 6, 2020, 03:37		#4
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	as far as I undestand, you have inlet in the left (for instance) of domain, top and bottom wall, which represents the tunnel and outlet on the right so you don't need to apply moving wall to inlet and outlet, apply it to the walls only __________________ best regards ****************************** press LIKE if this message was helpful

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October 5, 2020, 04:01		#3
MC_cfd_engineer New Member Join Date: Aug 2019 Location: Italy Posts: 3 Rep Power: 6	Hello, moving wall is available only for boundary condition wall, so it is not available for inlet boundary conditions..