Hi, I am having trouble correctly defining boundary conditions for my case. I have tried to illustrate the setup in the image. It is a LES-VOF simulation (interFoam) with water and air inlets as defined. "top" and "back" are noslip walls, "middle" is a symmetryPlane, "bottom" is a farfield/open-outlet type. At the outlet, i am expecting both air and water to exit simultaneously, as seen in the second image. Once the air reaches the outlet, I am having some velocity spikes and the simulation generally becomes very unstable, and I believe it is due to boundary conditions. I have also attached my 0/U and 0/p_rgh files, I am open to any suggestions! https://cdn.discordapp.com/attachments/400697259819270145/1498199642116984992/image.png?ex=69f04aa5&is=69eef925&hm=fd9b51ffa778addebad4174360887d8df0d1eae1e5078de8e01f55ff35687186& https://cdn.discordapp.com/attachments/400697259819270145/1498199642456719500/image.png?ex=69f04aa5&is=69eef925&hm=af12d8aed933f808c851ae9c1b796d0caea2db27d7d9ab1dbf0b6e16ee8b1a70& https://cdn.discordapp.com/attachments/400697259819270145/1498199642746392636/p_rgh?ex=69f04aa6&is=69eef926&hm=931fc9c968f8f451b7e24fd19a63061c555cd503daef780f9659e7d071292f3d& https://cdn.discordapp.com/attachments/400697259819270145/1498199643064897638/U?ex=69f04aa6&is=69eef926&hm=0a51972a9ee5a9bc6b8a4dfdb163b229228f27e0e89ac7f5ff67216d0002c74f&