Combine Solutions
Use a Combine Solutions node () to combine two solutions using concatenation or summation or to remove solutions:
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You can use concatenation to merge (concatenate) two time-dependent solutions that cover two disjunct time intervals so that it is possible to analyze and postprocess a combined solution over both time intervals.
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You can use summation (a plain or weighted summation) to sum a number of eigensolutions, for example, for further analysis.
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You can also remove solutions from a time-dependent solution, for example.
This node is also available in the solver configuration as a solver utility node. It then contains a General section, similar to the Combine Solutions Settings section below but with an additional Defined by study step list, which includes the Combine Solutions study steps and the User defined option for combining solutions at the solver level. By default, such Combine Solution nodes are generated from a corresponding Combine Solution node at the study level. At the solver level, there is also a Log section.
The Settings window contains the following section.
Combine Solutions Settings
From the Solution operation list, choose Concatenation (the default), Summation, Weighted summation, or Remove solutions.
Concatenation
For a concatenation of two solutions, specify the two solutions from the First solution and Second solution lists. The lists contain all available solutions and Solution Store nodes (from this and other studies in the model), including Current, which is the default and is the output from the preceding study step. The first solution is the governing solution, so that for an overlapped time interval between the two solutions, the set of solutions from the First solution is kept, and the set of solutions from the Second solution is ignored.
The default for both solutions is Current, which is not a valid setting: the concatenation should be of two different time-dependent, parametric, or eigenvalue solutions, one of which may be the Current option. Stationary solutions cannot be combined.
Summation and Weighted Summation
For a summation of solutions, choose a time-dependent, parametric, or eigenvalue solution from the Solution list.
Additionally, for a weighted summation, choose a method for the weights from the Weights method list: One expression, to use a single expression, in the Expression field, to define the weights for all solutions, or List of expressions, to define a list of expressions in the table below. For the latter case, the Indices column contains the solution numbers to be summed up. Solution numbers that are not shown in the table will not be summed up. The expressions in the List of expressions column define how the weights are calculated. The status of the check boxes in the Active column determines whether the corresponding solution number is taken into account in the summation or not.
If you only want to use the combined solution for a weighted summation, select the Clear source solution check box.
Remove Solutions
If you choose Remove solutions, you can remove some solutions (such as some eigenmodes, parametric solutions, or time steps) from the input solution. From the Exclude or Include list, choose Exclude (the default) or Include to use the criteria for choosing solutions as the ones to exclude or include in the operation for removing solutions.
From the Exclude method or Include method list, choose Explicit (the default) or Implicit to use an explicit choice of solutions or an implicit choice using a Boolean expressions for the solutions to exclude or include.
For Explicit, choose All, From list, or Manual from the Selection list. For From list, choose solutions to exclude or include from the list. For Manual, enter solutions as indices (integers) in the Index field.
For Implicit, enter a Boolean expression in the Exclude if or Include if field. All solutions for which the expression evaluates to true are excluded or included.
If you only want to use the combined solution (a version of the input solution with some solutions removed), select the Clear source solution check box.