Hi!<\/p>\n
I am running a stormwater retention pond using single phase approach in Fluent. The total height from free surface to the pond bottom is 3.3050m.
My boundary conditions are given below:
Inlet Pipe: Velocity InletOutlet Pipe: Pressure Outlet with gauge pressure 24320 Pa (hydrostatic pressure: 1000* g *Distance of the centroid of the outlet pipe from free surface h = 2.48m)<\/p>\n
Free surface: Zero Shear Wall<\/p>\n
Other Walls: No slip<\/p>\n
My operating pressure is 101325 pa <\/p>\n
refererence pressure location is X=0 Y=0 and Z=0.<\/p>\n
My question is how Ansys is calculating the pressure on free surface based on this condition. As it’s an open channel flow simulation pressure on free surface should be zero. But I am getting around 26900 pa.<\/p>\n
I know that Fluent always calulates the gauge pressure inside the computational domain using the following formula:
Pabs = Patm (Operating Pressure=101325 pa) + Gauge Pressure
In that sense, I am getting the gauge pressure on free surface as 26900 Pa. But according to the physics of open channel flow there should be zero guge pressure on free surface. So, how could I fix it?<\/p>\n","protected":false},"template":"","class_list":["post-462356","topic","type-topic","status-publish","hentry","topic-tag-ansys-fluent"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t