If you want to automatically update the solution(s) to an already solved Case when sending updated geometry from the CAD program to GoSimulate, check the Auto-solve checkbox for that Case. You may have several auto-solving Cases checked simultaneously. After solving a Case for the first time, Auto-solve will be checked by default.
If Auto-solve is not checked for a Case, the geometry representation and solutions for that Case will not change when you update the geometry from the CAD. Thus, if Auto-solve is checked after one or a few updates, some boundary conditions might be assigned to faces that are no longer existing, thus making the Case invalid. Refer to this section for a description of invalid Cases and how they can be handled.