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Ventilated Air Cavity CFD Simulation by ANSYS Fluent

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In this project, steady air flow over a ventilated air cavity is investigated.

This product includes a Mesh file and a comprehensive Training Movie.

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Description

Problem description

In this project, steady air flow over a ventilated air cavity is investigated. Simulated cavity has a hole which extends in flow direction all over the cavity length and makes the simulation more challenging. Fluid flow over objects is of great importance since the results are useful in several branches of fluid mechanics such as aerodynamics. Built-in hole in the cavity geometry enables flow penetration inside the cavity and reduces the pressure drop between upstream and downstream of the cavity which as a result decreases the drag force exerted on the cavity by the air flow. Air flow velocity at inlet boundary condition is equal to 1.7 m/s. due to high flow velocity, K-epsilon turbulence model is chosen for solving fluid flow domain equations. Maximum velocity captured in the domain is equal to 2.32 m/s which occurs on the leading edge of cavity.

Geometry and mesh

Geometry of fluid domain is designed in Design Modeler and computational grid is generated using Ansys Meshing. Mesh type is unstructured and element number is 803616.

ventilated air cavityventilated air cavity

Solver configuration

Critical assumptions:

  • Solver type is assumed Pressure Based.
  • Time formulation is assumed Steady.
  • Gravity effects is neglected.

The following table a summary of the defining steps of the problem and its solution.

Models (Ventilated Air Cavity)
Viscous K-epsilon model
Wall treatment standard
Materials (Ventilated Air Cavity)
Fluid Definition method Fluent Database
Material name air
Boundary conditions
Inlet Type Velocity inlet
X velocity 1.7 m/s
Turbulent intensity 4.7%
Hydraulic diameter 1.7 m
Solver configurations (Ventilated Air Cavity)
Pressure-velocity coupling Scheme SIMPLE
Spatial discretization Gradient Least square cell-based
Pressure Standard
Momentum Second order Upwind
K First order Upwind
Epsilon First order Upwind

Results and discussion

Air mass flow rate at outlet is equal to 6.747232 kg/s. Drag force for cube is equal to 0.0001168629 N.

There are a Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.

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