Constraints for solids can be either applied to points or lines or surfaces. In this example, the constraints are applied to one surface of the boundary of the solid.
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The condition must be assigned to the vertical surface with minimum X value.
In the local axes field, The GLOBAL option means to prescribe related to the global axes of the problem. This is used in this case. Local axes are used to prescribe the displacement in a direction not coincident with any of the global axes. The values part of the condition is used to prescribe a fixed amount of displacement. Default units are meters for the X, Y and Z displacements. In this case, the prescribed displacements are all zero.
X Constraint, Y Constraint and Z Constraint mean the displacements along the axes. Signs are as follows:
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