Intake of Jet Engine CFD Simulation by ANSYS Fluent Training

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In this project, airflow in a three-dimensional jet intake is investigated.

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

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Problem description

In this project, steady airflow in a three-dimensional jet intake geometry is investigated. Jet engines are one of the primary and most commonly used thruster in aerodynamics. Jet engines, including the intake section similar to the present work, are used for subsonic and supersonic flows. In subsonic flows, the flow velocity is higher than free stream velocity inside the intake domain, while in supersonic flows, the flow Mach number increases inside the intake domain. Intake is the first section which incoming air flows through to get to the engine itself. Intake geometry is designed to decrease and increase the cross-section to make the airflow uniform. In this project, air flows into the domain with a velocity equal to 3.55 m/s.

Geometry and mesh

The fluid domain geometry is designed in a Design modeler, and the computational grid is generated using Ansys meshing. The mesh type is unstructured, and the element number is 389136.


Jet Engine Intake CFD Simulation

Critical assumptions:

  • The solver type is assumed Pressure Based.
  • Time formulation is assumed Steady.
  • Gravity effects are neglected.

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

Models (Jet Engine)
Viscous K-epsilon model Standard
Near wall treatment Enhanced wall treatment
Fluid Definition method Fluent Database
Material name air
Boundary conditions (Jet Engine)
Inlet_air Type Velocity inlet
Velocity magnitude 3.55 kg/s
Turbulent intensity 10%
Turbulent viscosity ratio 10
Solver configurations (Jet Engine)
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 in the intake domain is equal to 0.02525548 kg/s. Due to a sudden decrease in cross-section of fluid flow, velocity inside the intake reaches higher magnitudes equal to 3.6 m/s. Before entering the intake domain, the Pressure of airflow reaches higher values equal to 5.96 Pa, which is due to the sudden decrease in flow cross-section.


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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