Summary for choosing a Simulink solver

The goal of this section is to help you defining your configuration for selecting a Simulink solver based on all the previous recommendations.

First, you need to know about the presence of continuous states (explicit state variables in Simcenter Amesim) in your models, see the following table. You will then be able to know whether you are in a C or a D situation. Please refer to Discrete or continuous Simulink solver for more details.

Simulink Model
Simcenter Amesim model	With continuous states	Without continuous states
With continuous states	C	C
Without continuous states	C	D

The following table is intended to specify the characteristics of your Simcenter Amesim and Simulink models. Please refer to Implicit or explicit Simulink solver (stiff or non-stiff systems) for more details.

Possible configurations at this point are: C1 to C9 and D1 to D9.

Simulink Model
Simcenter Amesim model	Non-stiff	Moderately stiff	Stiff
Non-stiff	C1, D1	C2, D2	C3, D3
Moderately stiff	C4, D4	C5, D5	C6, D6
Stiff	C7, D7	C8, D8	C9, D9

We will now introduce short notations for interface modes, as described in the table below. Sometimes indeed, specifying the interface mode will be needed. In the notations of this table, "as" means "Simcenter Amesim to Simulink", "sa" means "Simulink to Simcenter Amesim", "me" stands for "Model Exchange" whereas "cs" stands for "co-simulation".

Simulink Interface mode	Notation
Simulink to Simcenter Amesim	SL2AMECosim	sacs
Simcenter Amesim to Simulink	AME2SLCosim	ascs
AME2SL	asme

With the following table, you will be able to see what types of Simulink solvers are available for a given interface mode. Usually and if available, a variable-step solver - "V" - is recommended, except if a fixed-step solver - "F" - is needed (for instance for real-time applications). See Simulink solver type: fixed-step or variable-step for more details.

At this point, possible configurations are C1F to C9F, C1V to C9V, D1F to D9F, and D1V to D9V.

Simulink Interface mode	Simulink solver type	Combinations of Simcenter Amesim and Simulink model characteristics
Simulink to Simcenter Amesim	SL2AMECosim	Fixed step	C1F, …, C9F and D1F, …, D9F or more precisely: C1Fsacs, …, C9Fsacs & D1Fsacs,…, D9Fsacs
Simcenter Amesim to Simulink	AME2SLCosim	Fixed-step	C1F, …, C9F and D1F, …, D9F or more precisely: C1Fascs, …, C9Fascs & D1Fascs,…, D9Fascs
Variable-step	C1V, …, C9V and D1V, …, D9V or more precisely: C1Vascs, …, C9Vascs & D1Vascs,…, D9Vascs
AME2SL	Fixed-step	C1F, …, C9F and D1F, …, D9F or more precisely: C1Fasme, …, C9Fasme & D1Fasme,…, D9Fasme
Variable-step	C1V, …, C9V and D1V, …, D9V or more precisely: C1Vasme, …, C9Vasme & D1Vasme,…, D9Vasme

Finally, the table below allows you to select an appropriate Simulink solver for your configuration.

Configuration	Advised Simulink solver
D1F, … , D9F	Simulink fixed-step discrete solver
C1F, … , C9F	ode1, ode2, ode3, ode4, ode51, ode14x2
D1V, … , D9V	Simulink variable-step discrete solver
C1V, C4Vascs, C4Vsacs, C7Vascs, C7Vsacs	ode45, ode23, ode113
C2V, C5V, C4Vasme, C8Vascs, C8Vsacs	ode23t
C3V, C6V, C9V	ode15s, ode23s, ode23tb
1. See Choosing a fixed-step Simulink solver (for example, for Real-Time applications) for the process of choosing a continuous fixed-step solver. 2. The ode14x solver might be used in specific cases where a fixed-step continuous implicit solver is desired (e.g. if none of the previous solvers work).