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For 3D components, values or expressions for the Velocity of sliding wall uw should be specified. If the velocity vector entered is not in the plane of the wall, COMSOL Multiphysics projects it onto the tangential direction. Its magnitude is adjusted to be the same as the magnitude of the vector entered.
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For 2D components, the tangential direction is unambiguously defined by the direction of the boundary. For this reason, the sliding wall boundary condition has different definitions in different space dimensions. A single entry for the Velocity of the tangentially moving wall Uw should be specified in 2D.
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Apply reaction terms on can be set to Individual dependent variables (default) or All physics (symmetric). This setting is not available when Use DG constraints is selected.
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Select Elemental (default) or Nodal under Constraint method. This setting is not available for Use DG constraints or Use weak constraints.
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