[SUDEEPNSHARSHA]

Dear CFD Community,
I'm stuck with a meshing challenge in ICEM CFD and hoping someone can point me in the right direction. My model involves two fluid zones:
Preheat Zone: Where the fluid enters the system.
Reactor Zone: Where the fluid is heated to a specific temperature.
These zones are connected, and the fluid needs to flow seamlessly from one to the other. However, I'm having trouble creating the interface between them in ICEM CFD.
I've made many attempts by trying to merge the interface of the two zones, but I keep encountering problems in achieving the successful merging of the two zones.
I'd be incredibly grateful if anyone could offer insights or solutions to help me overcome this hurdle. Any advice on:
Recommended workflow for connecting fluid zones in ICEM CFD.
Specific settings or options for interface creation relevant to my scenario.
Troubleshooting tips for common errors encountered with fluid zone interfaces.
I've attached a brief visualization of the geometry, to provide further context.
Thank you in advance for your time and expertise!
Sincerely,
Sudeep N S