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/IMPL/NONLIN |
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/IMPL/NONLIN |
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/IMPL/NONLIN |
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/IMPL/NONLIN |
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/IMPL/NONLIN - Nonlinear Implicit Solution
Description
Nonlinear implicit methods.
Format
/IMPL/NONLIN/N
Data |
Description |
|---|---|
N |
Nonlinear solver method = 0: set to 1 = 1: Modified Newton method = 2: BFGS Quasi-Newton method |
L_A |
Maximum iteration number of stiffness matrix updates = 0: set to 3, if iterative solver and set to 6 if direct solver |
Itol |
Termination criteria = 0: set to 2 = 1: relative residual in energy = 2: relative residual in force = 3: relative residual in displacement =12: relative residual in energy and in force =13: relative residual in energy and in displacement =23: relative residual in force and in displacement =123: relative residual in force, energy and in displacement |
Toli ... Tolj ... Tolk |
When (Itol = 1, 2, 3), tolerance for termination Toli = 0 (default): set to 1.0e-3 for energy or displacement (Itol = 1, 3); set to 5.0e-3 for force (Itol = 2) When (Itol = 12, 13, 23) two tolerances for termination Toli Tolj =0.0 0.0 (default): set to 1.0e-3 for energy; to 1.0e-2 for force and 1.0e-2 for displacement When (Itol = 123) three tolerances for termination Toli Tolj Tolk =0.0 0.0 0.0 (default): set to 1.0e-3 for energy; to 1.0e-2 for force and 1.0e-2 for displacement |
| 1. | For static implicit computation, the loading should be defined as monotonous, increasing time function to better manage the convergence. |
| 2. | Order of input tolerance is according to the Itol value with 1: energy; 2: force; and 3: displacement. |
Example: Itol = 23, the order is Tolerance in force and Tolerance in displacement.
See Also: