Execution Settings🔗

Execution settings also known as Global simulation settings, consist of three execution types:

Each execution type consists of the same four (4) sections where variables are available specifically for each execution type:

Global vs Local simulation settings

Modelon Impact has two types of simulation settings:

Global simulation settings specify default simulation settings, are applied to all models and not stored in the model.
Local simulation settings specify simulation settings specific for a model and thus stored in the model. Local simulation settings are accessible in the Experimentation mode, under the EXPERIMENT tab and further down, the Analysis tab.

Simulation settings are grouped into:

Dynamic settings🔗

Simulation framework options for solving the FMU using the Assimulo simulation package.

General options for the AssimuloFMIAlg algorithm
	Default	Description
filter	None	A filter for choosing which variables to store result for. filter = "der", store all variables ending with 'der' and filter = ["der", "summary"], store all variables with "der" in the name and all variables starting with "summary".
ncp	500	Number of communication points. If ncp is zero, the solver will return the internal steps taken.
solver	"CVode"	Specifies the simulation method that is to be used. Currently supported solvers are, CVode, Radau5ODE, RungeKutta34, Dopri5, RodasODE, LSODAR, ExplicitEuler. The recommended solver is "CVode".
with_jacobian	False	Simulation with analytical Jacobian, Note: all models can't generate an analytical Jacobian.
write_scaled_result	False	When true, write the result to the file without taking numerical scaling into account.
dynamic_diagnostics	False	If enabled, additional diagnostic variables will be included in the simulation results.

Options for the chosen solver.

Selection of solver arguments for CVode
Option	Default	Description
disc	'BDF'	Discretization method. Can be either 'BDF' or 'Adams'.
h	0.01	The step-size for ExplicitEuler solver.
iter	'Newton'	The iteration method. Can be either 'Newton' or 'FixedPoint'.
maxord	5	The maximum order used. Maximum for 'BDF' is 5 while for the 'Adams' method, the maximum is 12.
maxh	Inf	Maximum step-size.
rtol	1e-4	Relative tolerance. The relative tolerance is retrieved from the 'default experiment' section in the XML file and if not found is set to 1.0e-4.
atol	rtol0.01(nominal values of the continuous states)	Absolute Tolerance. Can be an array where each value corresponds to the absolute tolerance for the corresponding variable. Can also be a single value.

Compiler options specify with what options a model is compiled into an FMU.

Selection of compilation options
Option	Default	Description
c_compiler	gcc	C compiler. msvs= Microsoft Visual Studio Compiler.
msvs_path		Path to the Microsoft Visual Studio Compiler to compile C code with. Will cause compilation to fail if no installation is found.
msvs_version		Microsoft Visual Studio Compiler version or year edition to compile C code with. If the msvs_path option is not set, then this option will be used to find an installation among the default install locations. If the msvs_path option is set, then this option will be used to verify the compiler version. In both cases, the compilation will fail if the installation found mismatch in the version specified with this option.
generate_html_diagnostics	false	If enabled, model diagnostics are generated in HTML format. This includes the flattened model, connection sets, alias sets and BLT form.
include_protected_variables	false	Includes protected variables in the compilation target interface if the protection annotation on the class allows viewing variables.

+ Add new adds additional solver options. Detailed descriptions on how to add a solver option are found in the Optimica Compiler Toolkit (OCT) user guide.