Hello Amine,

Initial volume info is known. I would like to find the difference between the initial volume and the final volume. The volume of the fluid is decreasing during the simulation. I generated a volume report (called report - def - 0) definition to identify the volume in the timesteps then tried to generate an expression in the following form,

Vinitial - report-def-0

I initialize the simulation and computed the first result. However, when I started the simulation, Fluent exited with an error message. Is there a better way to do this?