# Boundary conditions problem REEF3D

 Register Blogs Members List Search Today's Posts Mark Forums Read

 March 11, 2024, 04:46 Boundary conditions problem REEF3D #1 New Member   AGUSTIN ALEJANDRO MORENO TOVAR Join Date: Dec 2023 Location: Medellin, Colombia Posts: 4 Rep Power: 2 Hi REEF3D team. I am a student at the Rovira i Virgili University and I am working on a hydraulic structure in REEF3D, but I have a problem that I cannot identify. I am using as boundary condition B 60 1 (constant flow) and also B 61 2 (logarithmic profile bed), B 75 1 (zero gradient), B 76 1 (zero gradient pressure), B 77 1 (outflow controlled, zero gradient). pressure), and the model is emptying, showing zero flow at the outlet at the end of the simulation, but indicating that flow is entering. I attach an image of the beginning (1 second) and the end of the simulation (70 seconds). The calculation domain is 15 m long, 3.9 m wide, and 1.50 m high, with a mesh size of 3 cm. The exit ist only by the face right (C14 2).- I used 23.12 version Could you help me please to identify the problem? And in B31 the units are Pa? solid.zip 1_second.jpg 70_seconds.jpg Control: B 1 0.03 B 10 0.0 15.0 0.0 3.9 0.0 1.5 B 130 1 C 11 1 C 12 21 C 13 21 C 14 2 C 15 21 C 16 3 S 1 1 M 10 32 Ctrl: B 10 1 B 30 2 B 31 84753 B 50 0.003 B 60 1 B 61 2 B 77 1 D 10 4 F 30 3 F 40 3 F 50 1 F 56 0.35 F 60 0.35 I 10 1 M 10 32 N 40 3 N 41 80 N 47 0.2 P 10 1 P 25 1 P 29 1 P 30 0.25 P 71 1 P 75 1 P 79 1 T 10 2 W 1 997.9 W 10 0.300 W 22 -9.81

 April 10, 2024, 17:14 #2 Super Moderator   Hans Bihs Join Date: Jun 2009 Location: Trondheim, Norway Posts: 377 Rep Power: 17 Looks like there was a problem with the potential flow initialization. It is fixed in the newest RC (release candidate on github). __________________ Hans Bihs Team REEF3D www.reef3d.com