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CAE Fidesys 9.0 Documentation |
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CAE Fidesys 9.0 Documentation |
The solver settings for dynamic time analysis are carried out from the Command Panel by selecting (Mode - Calculation Settings, Calculation Settings - Transient Analysis, Transient - Solver).
Fig. 1 - Command panel, solver settings for dynamic transient analysis
In the Method drop-down list, select the system solution method linear algebraic equations at each step in time: a straight line (LU-decomposition) or iterative; by 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 for dynamic transient analysis
Convergence of iterative system of linear algebraic equations solution methods (one of them is the Uzava method) depends on the conditionality of the stiffness matrix of the system. For to improve convergence, you can use preconditioning:
with automatic method selection;
diagonal (Jacobi);
ILU0 - incomplete LU decomposition with zero filling level;
ILUT - incomplete LU decomposition with constraints;
ILU2 is an incomplete LU decomposition with the 2nd level of filling.
When choosing an iterative method, you must specify groups in the input windows Iterative solver parameters convergence parameters of the solution or leave the default values.
Click Apply.
Click Start Calculation.