Solver Configuration

The type of synchronisation of the physical network with the volumetric model. Defined as:

For more information, see Local solvers for physical networks.

Specifies the type of solver used to solve the physical network equations.

Dependencies

To use this parameter, set the Synchronisation type parameter to Continuous.

Solver name for usage with continuous synchronisation for the physical network. Defined as:

Dependencies

To use this parameter, set the Synchronisation type parameters to Continuous.

Solver name for usage with discrete synchronisation for the physical network. Defined as:

Dependencies

To use this parameter, set the Synchronisation type parameters to Discrete.

Integration step size of local solver for physical network in continuous synchronisation mode.

Dependencies

To use this parameter, set the Synchronisation type parameters to Continuous and the Solver type to Fixed-step.

Initial integration step size of the local solver for the physical network in continuous synchronisation mode.

Dependencies

To use this parameter, set the Synchronisation type parameters to Continuous and the Solver type to Variable-step.

Minimum integration step size of the local solver for a physical network in continuous synchronisation mode.

Dependencies

To use this parameter, set the Synchronisation type parameters to Continuous and the Solver type to Variable-step.

Maximum integration step size of the local solver for a physical network in continuous synchronisation mode.

Dependencies

To use this parameter, set the Synchronisation type parameters to Continuous and the Solver type to Variable-step.

Number of consecutive integration steps less than or equal to the minimum allowed step size, leading to forced termination of the calculation with an error message.

Dependencies

To use this parameter, set the Synchronisation type parameter to Continuous and the Solver type to Variable-step.

Together with relative accuracy, affect the closeness of the numerical and exact solutions. If a variable in the physical network is modulo less than this setpoint, the local error estimate for that variable is considered to be zero.

Dependencies

To use this parameter, set the Synchronisation type parameter to Continuous and the Solver type to Variable-step.

Together with absolute precision, affect the closeness of the numerical and exact solutions. Relative accuracy defines the allowable local error with respect to the variable value itself in the physical network.

Dependencies

To use this parameter, set the Synchronisation type parameters to Continuous and the Solver type to Variable-step.

Number of iterations of the solver of systems of nonlinear algebraic equations resulting from discretisation of the initial problem. Allows to limit the computational cost per integration step in discrete synchronisation mode. Usually used for real-time calculations.

Dependencies

To use this parameter, set the Synchronisation type parameters to Discrete and the Subsystem solver to ImplicitEuler (Fast) or Trapezoid (Fast).

By default, when this checkbox is unchecked, the simulation starts with some mode, generally a transient mode, which is determined as a result of the initialisation task.

When you select this checkbox, Engee tries to find a steady state that the physical network would arrive at if the signals at its input remained constant for a sufficiently long time (configurable separately). The simulation then starts from the found steady state.

Limit modelling time up to which the steady state search is attempted.

Dependencies

To use this parameter, select the Start simulation from steady state parameters check box.

Select this check box to use automatic differentiation when calculating the Jacobi matrix. Otherwise, finite differences will be used.

Select this checkbox to use the analytically derived Jacobi matrix in calculations. Otherwise it will be calculated numerically.

Select this checkbox to use sparse algebra when working with the Jacobi matrix. Otherwise its sparsity will not be taken into account in calculations.

The event detection mode of the physical network. Defined as:

Dependencies

To use this parameter, set the Synchronisation type parameter to Continuous.

Select this checkbox to enable physical invariant checks during simulation.

Defines the moments of time at which the inputs and outputs of the physical network are sampled.

Dependencies

To use this parameter, set the Synchronisation type parameters to Discrete.

Synchronisation interval of the local solver of the physical network with the solver of the volumetric model, specified as a positive scalar. Increasing the interval leads to speeding up the calculation at the expense of reducing its quality.

For more information on solver setup, see Local solvers for physical networks.

Dependencies

To use this parameter, set the Synchronisation type parameters to Continuous.

Select this check box (recommended) to use the experimental algorithm for initialising differential-algebraic systems of equations. Disabling the algorithm causes variable priorities to be ignored.