Create surfaces to cover openings
The internal Fluid Volume tool requires surfaces that cover all openings in a model.
The surfaces can be:
Boundary patches that exactly match the opening.
A work plane or surface that extends past the opening.
A developed surface that conforms to a curved shape.
For a planar surface, create an Offset Work Plane. If the work plane is inside the model, anything past it is not included. To remove sections of the model that are not required for simulation, create an internal bounding surface.
For an opening that has a connected set of edges, use Patch. Create a surface that matches the opening. A Boundary Patch can also blend across a curved shape.
For more complicated openings, use surfacing tools, such as Loft, Sweep, and Revolve.