A co-execution is the co-simulation execution of two analysis jobs that are executed in Abaqus/CAE in synchronization with one another using the same functionality as described in “Understanding analysis jobs,” Section 19.2. For more information on this analysis technique, see “Structural-to-structural co-simulation,” Section 17.3.1 of the Abaqus Analysis User's Guide, and “Fluid-to-structural and conjugate heat transfer co-simulation,” Section 17.3.2 of the Abaqus Analysis User's Guide.