Boundary Conditions
ANSYS software solves the Navier-Stokes equations hence the result for the calculated domain is a vector field. The vector field in general is represented as follows: V=U.i+V.j+W.k
Always remember to look at the coordinate system represented on the ANSYS CFX or FLUENT screen. This helps you see how to assign the boundary condition according the velocity components. Usually for Architectural applications your inflow is a window, door hence a plane surface. Always look at the plane surface and imagine a normal vector is applied on its surface. Then compare the normal vector direction with the coordinate system x,y and z direction. The normal vector component parallel to one of the three coordinate axis is the component required to apply for it a velocity value in the boundary condition interface window.
Normal Speed In
Considering after you mesh the fluid domain, assign the selected surface the inflow boundary condition. Remember that normal to the inflow boundary means a normal vector assigned to the inner side of the fluid domain.
Cartesian Velocity Components
Considering after you mesh the fluid domain, assign the selected surface the inflow boundary condition. Remember that normal to the inflow boundary means a normal vector assigned to the inner side of the fluid domain.
Static Pressure
You can apply the static pressure boundary condition, this is the case when the software adds to the atmospheric pressure variable the static pressure component , hence later adds both as the total pressure component represented in the Navier-Stokes equations.
Opening Pressure
You can apply the dynamic pressure boundary condition, this is the case when the software adds to the atmospheric pressure the dynamic pressure variable, hence later adds both as the total pressure component represented in the Navier-Stokes equations.
Outlet Velocity
This boundary condition considers the flow velocity vectors direction is contrary to the surface normal of the outlet surface.
Wall
The wall boundary condition applies newtons law to the selected surface. ANSYS dose provide you with the option of also selecting the surface friction coefficient.
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