Assigning Inflow to Phase 1 or Phase 2 in a Specific Region in REEF3D

MehdiGana · December 2, 2025, 06:46

Hi everyone,
I’m working with REEF3D and I have a question regarding boundary conditions. Specifically, I am working for flow in drop structure , and i want to know how to assigne a pecific flow rate in specific region with non-conventional shape (as showed in the picture attached)
I will share below the ctrl and corntrol file
Could someone explain the correct procedure please?
(The solid.stl file cannot be uploaded. If someone requires it to clarify the procedure for me, I can provide it via email)
Thanks in advance

valgrinda · December 17, 2025, 03:16

Hi Mehdi,

you could check the patchBC options for CFD, B 411 and onwards.

MehdiGana · December 17, 2025, 09:45

Thank you for your reply. B411 has been used in my CTR file, but the issue is that the flow is affected over the entire C11 surface, rather than at the specific location and in the desired shape.

December 17, 2025, 03:16		#2
valgrinda Super Moderator Hans Bihs Join Date: Jun 2009 Location: Trondheim, Norway Posts: 445 Rep Power: 20	Hi Mehdi, you could check the patchBC options for CFD, B 411 and onwards. __________________ Hans Bihs Team REEF3D www.reef3d.com

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December 17, 2025, 09:45		#3
MehdiGana New Member EL MEHDI EL GANA Join Date: Feb 2024 Location: Morocco Posts: 8 Rep Power: 3	Thank you for your reply. B411 has been used in my CTR file, but the issue is that the flow is affected over the entire C11 surface, rather than at the specific location and in the desired shape.