7.2.1 Convergence and time integration criteria: overview
Numerous control parameters are associated with the convergence and integration accuracy algorithms in Abaqus/Standard. These parameters are assigned default values that are chosen to optimize the accuracy and efficiency of the solution for a wide spectrum of nonlinear problems. You can change the solution control parameters, as described in the following sections:
A brief synopsis of the more important solution control parameters, together with a description of the circumstances in which they can be used effectively, is provided in “Commonly used control parameters,” Section 7.2.2. This section is likely to be the most useful for the general user and should be read first.
Abaqus/Standard incorporates an empirical algorithm designed to solve the equilibrium equations of nonlinear systems accurately and economically. The criteria used to establish convergence of nonlinear increments and the automatic adjustment of increment size based on the convergence rate are described in “Convergence criteria for nonlinear problems,” Section 7.2.3.
Abaqus/Standard allows you to choose “time integration accuracy parameters” in problems that have a physical time scale. The algorithms that use these parameters for automatically controlling time increment sizes are described in “Time integration accuracy in transient problems,” Section 7.2.4.
Abaqus/CFD allows you to choose the control parameters used in an Abaqus/CFD to Abaqus/Standard or to Abaqus/Explicit co-simulation to alleviate instability and mesh distortion during the analysis.
Modifying the default solution controls
The default values for the solution control parameters need not be adjusted for most cases. You can reset them, however, within a step definition.
Values given for the solution control parameters remain in effect for the remainder of the analysis or until they are reset.
| Input File Usage: | *CONTROLS |
|
The *CONTROLS option can be repeated, if necessary, with different parameters. |
| Abaqus/CAE Usage: | Step module:  : toggle on Specify |
Resetting all default solution controls
You can restore all solution control parameters to their default values.
| Abaqus/CAE Usage: | Step module: : toggle on Reset all parameters to their system-defined defaults |
| Your query was poorly formed. Please make corrections. |
7.2.1 Convergence and time integration criteria: overview
Numerous control parameters are associated with the convergence and integration accuracy algorithms in Abaqus/Standard. These parameters are assigned default values that are chosen to optimize the accuracy and efficiency of the solution for a wide spectrum of nonlinear problems. You can change the solution control parameters, as described in the following sections:
A brief synopsis of the more important solution control parameters, together with a description of the circumstances in which they can be used effectively, is provided in “Commonly used control parameters,” Section 7.2.2. This section is likely to be the most useful for the general user and should be read first.
Abaqus/Standard incorporates an empirical algorithm designed to solve the equilibrium equations of nonlinear systems accurately and economically. The criteria used to establish convergence of nonlinear increments and the automatic adjustment of increment size based on the convergence rate are described in “Convergence criteria for nonlinear problems,” Section 7.2.3.
Abaqus/Standard allows you to choose “time integration accuracy parameters” in problems that have a physical time scale. The algorithms that use these parameters for automatically controlling time increment sizes are described in “Time integration accuracy in transient problems,” Section 7.2.4.
Abaqus/CFD allows you to choose the control parameters used in an Abaqus/CFD to Abaqus/Standard or to Abaqus/Explicit co-simulation to alleviate instability and mesh distortion during the analysis.
| Your query was poorly formed. Please make corrections. |
Modifying the default solution controls
The default values for the solution control parameters need not be adjusted for most cases. You can reset them, however, within a step definition.
Values given for the solution control parameters remain in effect for the remainder of the analysis or until they are reset.
| Input File Usage: | *CONTROLS |
|
The *CONTROLS option can be repeated, if necessary, with different parameters. |
| Abaqus/CAE Usage: | Step module: : toggle on Specify |
| Your query was poorly formed. Please make corrections. |
Resetting all default solution controls
You can restore all solution control parameters to their default values.
| Abaqus/CAE Usage: | Step module: : toggle on Reset all parameters to their system-defined defaults |
| Your query was poorly formed. Please make corrections. |
| Your query was poorly formed. Please make corrections. |
| Your query was poorly formed. Please make corrections. |
