Hi, I can create upper side internal flow volume but cannot do for the bottom side. Can anybody help on this? [image] nozzle clean | SimScale Workbench

Hello, If you pick the two boundary faces, the volume gets detected. [2025-07-16 14_29_22-nozzle clean - Copy _ SimScale Workbench] This was the detected volume: [2025-07-16 14_28_59-nozzle clean - Copy _ SimScale Workbench] Regards, Ranjeeth

Thanks! but next i tried to run simulation but cannot it said had multiple bodies? And I tried another model with connected bodies but also cannot.Please help! nozzle clean | SimScale Workbench [image]

Hi, incompressible simulations can be run with a single flow region at a time. You’d have to delete a flow region to proceed.

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Internal flow volume cannot create

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rrnaik_cfd July 16, 2025, 6:32pm 2

Hello,
If you pick the two boundary faces, the volume gets detected.

This was the detected volume:

Regards,
Ranjeeth