Proper(more stable) boundary condition for free surface problem

CFD-fellow · November 1, 2014, 03:41

Hi
Im modeling a partially submerged body in ANSYS CFX. My simulation also contains cavitation, which makes the simulation more unstable.
According to attached picture which boundary condition is more stable from numerical point of view for the side wall and please tell why?

ghorrocks · November 1, 2014, 05:44

What are you modelling? Where is the cavitation? Is this a body floating on an infinite water body, or a body in a pipeline?

CFD-fellow · November 1, 2014, 06:26

Hi
Its a partially submerged hydrofoil with a distinguished angle of attack which half of the chord is submerged in water. The cavitation occurs at the trailing edge of hydrofoil. which boundary condition is more stable for the side of my domain?

ghorrocks · November 1, 2014, 06:30

Quote:

which boundary condition is more stable for the side of my domain?

A wall, with a tangential velocity of the free stream velocity.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
UDS problem with wall boundary condition	Alex F.	FLUENT	15	September 21, 2015 10:28
External Radiation Boundary Condition (Two sided wall), Grid Interface	CFD XUE	FLUENT	0	July 8, 2010 07:49
[Gmsh] Import problem	ARC	OpenFOAM Meshing & Mesh Conversion	0	February 27, 2010 11:56
Slip boundary condition what is inside	normunds	OpenFOAM Running, Solving & CFD	2	June 4, 2007 07:45
a problem with Boundary condition	M Rad	Main CFD Forum	12	November 27, 1998 13:49

November 1, 2014, 05:44		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	What are you modelling? Where is the cavitation? Is this a body floating on an infinite water body, or a body in a pipeline?

November 1, 2014, 06:26		#3
CFD-fellow Senior Member Behrooz Jamshidi Join Date: Apr 2013 Posts: 110 Rep Power: 13	Hi Its a partially submerged hydrofoil with a distinguished angle of attack which half of the chord is submerged in water. The cavitation occurs at the trailing edge of hydrofoil. which boundary condition is more stable for the side of my domain?