This option is used to specify the rendezvousing scheme for co-simulation. It must be used in conjunction with the *CO-SIMULATION option to identify the analysis program for which the co-simulation controls are specified. This option is not required for co-simulation with MADYMO.
Products: Abaqus/Standard Abaqus/Explicit Abaqus/CAE
Type: History data
Level: Step
Abaqus/CAE: Interaction module
Set this parameter equal to the label that will be used to identify the co-simulation controls. All co-simulation control names in the same input file must be unique.
Set this parameter equal to a value that defines the constant coupling step size to be used throughout the coupled simulation.
Set STEP SIZE=IMPORT for Abaqus to import a coupling step size from the external program for the next coupling step. This setting is valid only when used with the *CO-SIMULATION, PROGRAM=MULTIPHYSICS or MPCCI option.
Set STEP SIZE=EXPORT for Abaqus to export a coupling step size to the external program for the next coupling step. This setting is valid only when used with the *CO-SIMULATION, PROGRAM=MULTIPHYSICS or MPCCI option.
Set STEP SIZE=MAX for Abaqus to select the maximum coupling step size based on the suggested coupling step size of Abaqus and the external program. This setting is valid only when used with the *CO-SIMULATION, PROGRAM=MULTIPHYSICS option.
Set STEP SIZE=MIN for Abaqus to select the minimum coupling step size based on the suggested coupling step size of Abaqus and the external program. This setting is valid only when used with the *CO-SIMULATION, PROGRAM=MULTIPHYSICS option.
When you specify PROGRAM=ABAQUS with the *CO-SIMULATION option, you can specify the STEP SIZE parameter only in the Abaqus/Explicit analysis. If you do not specify the STEP SIZE parameter, the step size is computed automatically.
Set COUPLING SCHEME=GAUSS-SEIDEL to select a Gauss-Seidel coupling algorithm (also referred to as a serial coupling scheme) where the simulations are executed in sequential order.
Set COUPLING SCHEME=JACOBI to select the Jacobi coupling algorithm (also referred to as a parallel coupling scheme) where both simulations are executed concurrently, exchanging fields to update the respective solutions at the next target time.
Set SCHEME MODIFIER=LEAD if Abaqus leads the co-simulation. In this case the third-party analysis program needs to lag the co-simulation.
Set SCHEME MODIFIER=LAG if Abaqus lags the co-simulation. In this case the third-party analysis program needs to lead the co-simulation.
Set SCHEME MODIFIER=SEND PREDICTOR if Abaqus lags the co-simulation and can compute predictor fields for the next coupling step. In this case the third-party analysis program needs to lead the co-simulation and be able to receive predictor fields.
Set SCHEME MODIFIER=RECEIVE PREDICTOR if Abaqus leads the co-simulation and can receive predictor fields to advance the co-simulation. In this case the third-party analysis program needs to lag the co-simulation and be able to send predictor fields for the upcoming coupling step.
This parameter is valid only for an Abaqus/Standard analysis used with the parameter TIME INCREMENTATION=SUBCYCLE and *CO-SIMULATION, PROGRAM=ABAQUS option.
Set FACTORIZATION FREQUENCY=EXPLICIT INCREMENT (default) to specify factoring of the interface matrix every Abaqus/Explicit increment.
Set FACTORIZATION FREQUENCY=STANDARD INCREMENT to specify factoring of the interface matrix once per Abaqus/Standard increment.
Set TIME INCREMENTATION=SUBCYCLE (default) to allow Abaqus to take one or more increments to reach the next target time to exchange data with the external program.
Set TIME INCREMENTATION=LOCKSTEP to force Abaqus to use only one increment to reach the next target time.
Set TIME MARKS=YES (default) to enforce the target time in an exact manner; that is, Abaqus will temporarily cut back the increment such that the exchange occurs at the specified target time.
Set TIME MARKS=NO to enforce the target time in a loose manner. This setting is applicable only when TIME INCREMENTATION=SUBCYCLE is used.
This parameter does not apply when using the *CO-SIMULATION, PROGRAM=ABAQUS option; the target time will always be enforced in an exact manner.