Methods to Apply Kinematic Conditions
Numerical methods available in Radioss to apply the kinematic
conditions are:
- Penalty Method (Rigid Walls)
- The node displacements are constrained by the application of penalty forces.
- Main Secondary Kinematic Condition (Interface TYPE2 and Rigid Body)
- All secondary nodes lose their independence. The degrees of freedom of the secondary nodes are expressed as a function of a main node or element.
- Local Kinematic Condition (Rigid Link and Cylindrical Joint)
- Constraint equations are applied to the nodes to satisfy local kinematic conditions. No main node is used.
- Lagrange Multiplier (Radioss V44)
- This method consists in the nonlinear resolution of the equilibrium equations under constraints. This method is optional for some classical kinematic conditions as: interfaces, rigid wall, rigid body and boundary conditions. It is a unique method that is available for some new kinematic conditions, such as: gear joints and interface TYPE16 and TYPE17.