Radial inflow through perforated pipes

Miky1020 · January 29, 2014, 19:36

Hi all,

I am simulating the flow in a pipe with radial perforations. I am attempting to do it by no having the perforations in the mesh but by setting a mass source term on the wall boundary condition, so I can avoid issues related with too different dimension scales in the mesh. The cylindrical surface of the pipe is defined as a wall with a mass source expressed by a mass flux and the velocity components to fix the direction. The inflow through the perforations is radial but the option to set the velocity components is only via cartesian coordinates.

Any advice?

Thanks in advance.

ghorrocks · January 30, 2014, 03:55

Define the velocity of the mass source as a function of the position to give the direction in cartesian coordinates. For instance for a radius 1 circle on the XY plane it would be VelX = -x, Vely = -y, VelZ = 0.

I will let you sort out the transform to position it where you want and to scale it to get the correct velocity.

January 29, 2014, 19:36	Radial inflow through perforated pipes	#1
Miky1020 New Member Miguel Baritto Join Date: Mar 2009 Location: Caracas,Venezuela Posts: 16 Rep Power: 17	Hi all, I am simulating the flow in a pipe with radial perforations. I am attempting to do it by no having the perforations in the mesh but by setting a mass source term on the wall boundary condition, so I can avoid issues related with too different dimension scales in the mesh. The cylindrical surface of the pipe is defined as a wall with a mass source expressed by a mass flux and the velocity components to fix the direction. The inflow through the perforations is radial but the option to set the velocity components is only via cartesian coordinates. Any advice? Thanks in advance.

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January 30, 2014, 03:55		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Define the velocity of the mass source as a function of the position to give the direction in cartesian coordinates. For instance for a radius 1 circle on the XY plane it would be VelX = -x, Vely = -y, VelZ = 0. I will let you sort out the transform to position it where you want and to scale it to get the correct velocity.