For some pipeline models, it might be more flexible to use vertical springs to suppress upheaval than restraining displacements in a certain direction.
One typical example is shown below [N, mm]:
*spring, elset=Vertical-Springs, nonlinear
3,
0.0, -19.0
0.0, 0.0
75.0, 20.0
7500.0, 60.0
101020.0, 200.0
**
*ELEMENT, TYPE = SPRING1
990000001, 1
*ELGEN, ELSET = Vertical-Springs
990000001, NumOfNodes, 1, 1
Remember that only remove/add the vertical spring at the proper step.
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