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If a zero displacement is applied in all directions, this is the same as a Fixed Constraint for the porous matrix and a Sound Hard Wall for the fluid.
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To define a prescribed displacement for each space direction (x, y, and z for 3D), select one or more of the Prescribed in x direction, Prescribed in y direction, and Prescribed in z direction check boxes. Then enter a value or expression for the prescribed displacements u0, v0, or w0 (SI unit: m).
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For 2D axisymmetric components and to define a prescribed displacement for each space direction (r and z), select one or both of the Prescribed in r direction and Prescribed in z direction check boxes. Then enter a value or expression for the prescribed displacements u0 or w0 (SI unit: m).
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) and select