Hi Alain,
It was possible in previous releases.
The workflow was the following:
1) Animate the transient analysis (you had to have saved intermediat results).
2) Define the cut plane
3) Calculate the bulk value with the animation running !
4) Save the bulk values in a csv file.
I'll create a pos in the Idea station asking to have this feature available again.
Please accept solution and give likes if applicable
Benoit Neu-Faber
INNOSIM https://servicesmarketplace.autodesk.com/provider/public/innosim
Autodesk Service Provider / CFD Trainer
https://www.linkedin.com/in/benoit-neu-faber/