Use a Combine Solutions node () to combine two solutions using concatenation or summation. For example, you can 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, or you can sum the solutions for further analysis.

This node is also available in the solver configuration as a solver utility node. It then contains a General section, similar to the Study 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 sections.

From the Solution operation list, choose Concatenation (the default) or Summation.

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.

For a summation of solutions, choose a time-dependent, parametric, or eigenvalue solution from the Solution list.