When this box is selected, the solver attempts to find the steady state that would result if the inputs to the system were held constant for a sufficiently large time, starting from the initial state obtained from the initial conditions computation. For more information, see Initial Conditions Computation. Simulation then starts from this steady state.

For models compatible with frequency-and-time equation formulation, when you select this check box, the solver attempts to perform sinusoidal steady-state initialization. In other words, initialization is performed using frequency-time equations, and then the simulation proceeds using the actual equation formulation and other options selected in the Solver Configuration block. For more information, see Frequency and Time Simulation Mode.

This parameter affects the nonlinear solver used for computing initial conditions and for transient initialization. It determines how accurately the algebraic constraints are to be satisfied at the beginning of simulation and after every discrete event (for example, a discontinuity resulting from a valve opening, a hard stop, and so on). Decrease the parameter value (that is, tighten tolerance) to obtain a more reliable time simulation. Increase the parameter value (that is, relax the tolerance) if solving for initial conditions failed to converge, or to reduce the computation time.

The default value is 1e-9, which is applicable to most cases.

Lets you use a sample-based local solver with a sample time specified by the Sample time parameter. In sample-based simulation, all the Physical Network states, which are otherwise continuous, become represented to Simulink^® as discrete states. The solver updates the states once per time step. This option is especially useful for generated code or hardware-in-the-loop (HIL) simulations.

Select the solver type used for updating the states: Backward Euler, Trapezoidal Rule, or Partitioning. The Use local solver check box must be selected. The default is Backward Euler.

Specify the sample time for the local solver. The Use local solver check box must be selected. The sample time must be positive. The default is .001 s.

Select whether to prioritize speed or robustness when using Partitioning local solver:

The Use local solver check box must be selected and the Solver type must be set to Partitioning. The default is Robust simulation.

When you use the Partitioning solver, it solves the small switched linear equations consecutively. You can choose to store the matrix inverses, to improve the simulation performance. Then, if the same configuration is detected in a subsequent time step, the partitioning solver uses the stored matrix inverses, instead of recomputing them. Select the method used for storing partitioning data:

The Use local solver check box must be selected and the Solver type must be set to Partitioning. The default is As needed.

Specify the maximum memory budget, in kB, allowed for storing cached partition data. The Partition storage method method must be set to Exhaustive. The default is 1024 kB. If this budget is exceeded, simulation errors out. You can adjust this value based on your available memory resources and on the Total memory estimate data in the Statistics Viewer. For more information, see Model Statistics Available when Using the Partitioning Solver.

Lets you perform transient initialization at a fixed computational cost.

If you select this check box, you can specify the number of nonlinear and mode iterations for transient initialization. If the system does not converge once it performs the specified number of iterations, it ignores the failure and goes to the next step.

If you clear the check box, the system uses a more robust and time-consuming algorithm, performing as many iterations as necessary to reach convergence, and errors out if it fails to reach convergence at the time of transient initialization.

Specify the number of Newton iterations to be performed at the time of transient initialization. The Use fixed-cost runtime consistency iterations check box must be selected. The default number is 3.

Specify the number of mode iterations to be performed at the time of transient initialization. The Use fixed-cost runtime consistency iterations check box must be selected. The default number is 2.

Only one major mode update per step is performed when using local solvers, therefore this parameter is not available if the Use local solver check box is selected.

Lets you manage computational cost of impulse detection during transient initialization, both for global and local solvers. This check box becomes available when the Use fixed-cost runtime consistency iterations check box is selected.

Event-based methods of state reinitialization and impulse handling let you model physical phenomena, such as collisions and bouncing balls, and provide a significant boost in simulation speed for such models. However, impulse detection can add cost to transient initialization. This cost is proportional to the number of impulse iterations performed to reach convergence.

If you select the Compute impulses check box, you can specify the number of impulse iterations to perform during transient initialization. If the system does not converge upon reaching these numbers, it ignores the failure and goes to the next step.

If you clear the check box, the system computes impulses as many times as necessary to reach convergence.

Specify the number of impulse iterations at the time of transient initialization. The Compute impulses check box must be selected. The default number is 2.

Specifies how the solver treats matrices. The parameter can have one of three values: auto, Sparse, or Full. The default value of the parameter is auto. With this setting, the solver automatically selects the appropriate option, either sparse or full, for treating the matrices.

Your choice of this parameter value is implemented in both model simulation and code generated from your model.

Specifies how the solver treats sinusoidal variables. The parameter can have one of two values: Time or Frequency and time. The default value of the parameter is Time.

Use the Frequency and time value to speed up simulation of systems with a single nominal frequency. For more information, see Frequency and Time Simulation Mode.

Specify the maximum memory budget, in kB, allowed for processing delays when simulating models that contain either blocks from the Delays library, or custom blocks using the delay Simscape language construct. The purpose of this parameter is to protect against excessive memory swapping. If this budget is exceeded, simulation errors out. You can adjust this value based on your available memory resources. The default number is 1024 kB.

This option is applicable only for models that connect blocks from Simscape Multibody™ Second Generation library to Simscape blocks, or blocks from other add-on products. Use the Statistics Viewer to determine whether your model has 1-D/3-D connections. For more information, see 1-D/3-D Interface Statistics.

When a Simscape Multibody block is connected directly to a Simscape network, an additional derivative may be required for the network to be solved. When you select this check box, the solver automatically applies input filtering to the signal entering the Simulink-PS Converter block to obtain this additional derivative. The Filtering time constant parameter provides the time constant for the delay.

This parameter specifies the filtering time constant for when the Apply filtering at 1-D/3-D connections when needed check box is selected. The parameter value applies globally to all connections belonging to the network that includes this Solver Configuration block. The default value is 0.001 s.