# y-gravity in 2D axisymmetric case

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 March 3, 2023, 14:39 y-gravity in 2D axisymmetric case #1 New Member   Andrew Join Date: Dec 2022 Posts: 29 Rep Power: 3 A simple clarification question - In a 2D axisymmetric case, the x-axis is the axis of symmetry. Then, applying gravity in the +x or -x direction simulates a vertically-oriented tube (gravity acts axially). Does y-directed gravity then simulate a horizontally-oriented tube? (This makes the most sense to me, but then the domain is not exactly symmetric). Or, would it simulate a tube with gravity always directed radially/towards the center? (This would preserve symmetry, but I can't imagine why this would be useful). If anyone can confirm that y-directed gravity in 2D axisymmetric case simulates a horizontally-oriented tube, I'd greatly appreciate it. Thanks!

 March 6, 2023, 11:02 #2 New Member   Alan Join Date: Dec 2021 Posts: 7 Rep Power: 4 Fluent requires that the axis of symmetry is on the x-axis. In this case, no fluid can cross the symmetry axis, and no fluid is expected to move in the tangential direction. Therefore the gravity expressed in the y-direction would be the same as expressing it in the radial direction and is not the same as simulating a horizontally oriented tube. If your problem contains just one phase, check if gravity can be neglected. If gravity is important, do a 3D simulation. andrew-c likes this.

 Tags axial, axisymmetric, gravity, tube