To solve an elastic problem, Ansys Polyflow requires information about the displacement (or force) along the boundary of the computational domain. To have a well-posed elastic problem, boundary conditions must avoid rigid motion.
Important: Rigid motion causes convergence problems and may result in a zero pivot error message.
The default condition defined by Ansys Polydata on each section of a boundary is zero displacement (normal and tangential), except for the axis of symmetry in an axisymmetrical model. In this case, Ansys Polydata automatically creates a symmetry condition along the line r = 0. Where appropriate, keep the default boundary condition and specify new conditions for the rest of the boundary sections.
The boundary conditions available in Ansys Polydata are:
interface with solid.
interface with fluid.
normal and tangential displacement imposed.
normal and tangential force imposed.
normal displacement and tangential force imposed.
normal force and tangential displacement imposed.
plane or axis of symmetry.
contact with parison.
border of moving part.
assign displacement at points.
no displacement.
free displacement.
Cartesian displacement imposed.
global force imposed.
When setting elastic boundary conditions in Ansys Polydata, do the following:
Select the displacement boundary conditions in the sub-task menu. Ansys Polydata will open the Displacement boundary conditions panel, displaying the default boundary conditions.
Select the appropriate boundary section.
Click Modify to change the boundary condition.