Integrating over the results gives me problems though. I want to enter the same expression as for the plot, and integrate this either over the volume of a subdomain or a surface that's defined in the geometry. However, as soon as I select "Join 1" as the dataset for the integration, all options for picking integration domain disappear.
Selections can only be specified for data sets that always correspond directly to a given geometry: Solution and Mesh data sets.
To do what you want, you can specify the selection in a different way:
- Create copies of the Solution data sets that you are using in the Join data sets.
- For each of the Solution data set copies: Add a selection to the data set using the context menu. Set the domain or boundary selection that you want to use.
- Change the Join data sets to point to the Solution data sets with selections.