[Nicholas_Langbein]

Hey guys,

Base tutorial : Cavity

i want to modify lid driven cavity flow into flow between parallel plates but driven by gravity alone.

i made blockMeshDict : topFace, btmFace, walls, FrontandBack
gravity in constant (0,-9.81,0)

I just want the fluid to flow down due to gravity. what will be appropriate boundary conditions for U and p
for walls its zeroGradient
what BC's should i give for U and p for top and bottom face.

[urgerjustify]

Originally Posted by Nicholas_Langbein

Hey guys,

Base tutorial : Cavity

i want to modify lid driven cavity flow into flow between parallel plates but driven by gravity alone.

i made blockMeshDict : topFace, btmFace, walls, FrontandBack
gravity in constant (0,-9.81,0)
Some geometry dash wave segments will not have typical terrain but other obstacles.
I just want the fluid to flow down due to gravity. what will be appropriate boundary conditions for U and p
for walls its zeroGradient
what BC's should i give for U and p for top and bottom face.

For the flow between parallel plates driven by gravity, set the velocity boundary condition to zeroGradient for the top face and noSlip for the bottom face, with zeroGradient for both velocity and pressure on the side walls. For pressure, apply zeroGradient at all boundaries (top, bottom, and sides). This setup ensures the fluid flows due to gravity without imposed pressure gradients.