Session 8

Fluent Meshing Training Course: Session 8 - Boundary Condition Assignment

In this session, a basic 3D cubic geometry was generated in SpaceClaim and transferred to Fluent Meshing. Named selections were created within the CAD software to enable automatic boundary detection. Local mesh refinement was implemented to regulate surface discretization and produce the surface mesh. The geometry was designated as a fluid-only region in preparation for boundary specification.

Available Boundary Condition Categories

The boundary condition options accessible in Fluent Meshing include:

Velocity Inlet: Defines flow speed and direction when inlet velocity values are predetermined.

Pressure Inlet: Sets static or stagnation pressure at the entrance, frequently used for compressible flows or external aerodynamics.

Mass Flow Inlet/Outlet: Enforces specified mass flow rates, suitable for duct systems or experimental setups.

Pressure Outlet: Establishes static pressure at the exit boundary, a commonly used option that permits flow adaptation.

Outflow: Assumes completely developed flow conditions when exit information is not available.

Symmetry: Establishes symmetry boundaries to reduce computational domain size and improve efficiency.

Wall: Defines solid surfaces with configurable options including no-slip, slip, surface roughness, and heat transfer properties.

Internal/Interface: Designates interior surfaces or mesh interfaces to maintain continuity across regions.

Far-Field: Specifies freestream boundary conditions, commonly applied in external flow simulations.

Advanced Conditions: Additional options including Overset interfaces, Fan components (Intake, Exhaust, Simplified models), Vent boundaries (Inlet/Outlet), Porous Jump, and Radiator were presented for specialized applications in rotating equipment, ventilation systems, or thermal management devices.

Boundary Finalization

Following the review and adjustment of boundary classifications as needed, the “Update Boundaries” command was executed. This operation validated all boundary assignments and readied the configuration for volume meshing and computational solver initialization.