Settings of the System of Linear Algebraic Equation Solution for Buckling Calculating

System of linear algebraic equation solution settings when calculating of buckling are carried out from the Command Panel by selecting (Mode - Calculation Settings, Calculation Settings - Buckling, Buckling- Solver).

Fig. 1 - Command panel, settings of the system of linear algebraic equation solver when calculating the loss of stability

In the drop-down list the method should be selected system of linear algebraic equation solution method: direct (LU-decomposition) or iterative; default the method is selected automatically. If the iterative method is selected, the Command Panel takes the following form:

Fig. 2 - Command panel, iterative solver settings

Convergence of iterative methods of solving system of linear algebraic equation (one of they are the Uzava method) depends on the conditionality of the stiffness matrix of the system. To improve convergence , you can use preconditioning:

with automatic method selection;
diagonal (Jacobi);
ILU0 - incomplete LU decomposition with zero level filling;
ILUT - incomplete LU decomposition with constraints;
ILU2 - incomplete LU decomposition with 2nd level fill-ins.

For the iterative method, it is necessary to set the groups in the input windows Iterative solver parameters convergence parameters of the solution or leave the default values.

Click Apply.

Click Start Calculation.