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y-gravity in 2D axisymmetric case

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Old   March 3, 2023, 14:39
Red face y-gravity in 2D axisymmetric case
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Andrew
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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!
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Old   March 6, 2023, 11:02
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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.
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