Flap Effect on Trailing Edge of an Airfoil Simulation, ANSYS Fluent Training


  • The problem numerically simulates the Flap Effect on the Trailing Edge of an Airfoil using ANSYS Fluent software.
  • We design the 2-D model by the Design Modeler software.
  • We mesh the model with ANSYS Meshing software, and the element number equals 64731.
  • We aim to study Drag and Lift forces in this project.

Special Offers For Single Product

If you need the Geometry designing and Mesh generation training video for one product, you can choose this option.
If you need expert consultation through the training video, this option gives you 1-hour technical support.
The journal file in ANSYS Fluent is used to record and automate simulations for repeatability and batch processing.
editable geometry and mesh allows users to create and modify geometry and mesh to define the computational domain for simulations.
The case and data files in ANSYS Fluent store the simulation setup and results, respectively, for analysis and post-processing.
Geometry, Mesh, and CFD Simulation methodologygy explanation, result analysis and conclusion
The MR CFD certification can be a valuable addition to a student resume, and passing the interactive test can demonstrate a strong understanding of CFD simulation principles and techniques related to this product.



In this project, steady airflow over a flapped airfoil with an attack angle equal to 12 degrees is investigated by ANSYS Fluent software. We perform this CFD project and investigate it by CFD analysis.

The present model is designed in two dimensions using Design Modeler software. The meshing of the model has been done using ANSYS Meshing software. The element number is 64731.

Flap Methodology

A flap is a high-lift device used to reduce the stalling speed of an aircraft wing. Flaps are usually mounted on the wing trailing edges of a fixed-wing aircraft. Flaps also cause an increase in drag, so they are retracted when not needed.

This project investigates steady airflow over a flapped airfoil with an attack angle of 12 degrees. The air enters the domain with a velocity magnitude of 45m/s and passes over the airfoil.

To capture the flow patterns near the airfoil’s surface and to calculate drag and lift forces precisely, the SST k-omega model is used.

Flap Conclusion

At the end of the solution process, two-dimensional contours related to the velocity, pressure, and turbulent viscosity inside the domain are obtained. The contours related to pressure clearly show how the pressure difference between the pressure and suction sides of the airfoil can contribute to the generation of lift force.

Also, the stagnation point in the leading edge can be observed. Furthermore, the wake region is conspicuously observable in the velocity and turbulent viscosity contour.

In addition, based on the calculated values for lift and drag forces, The lift coefficient of an airfoil with and without the flap is equal to 1.2182 and 1.0530, which shows the effectiveness of the flap in aerodynamic lift force generation.

Moreover, the drag coefficient of the airfoil in the presence of a flap is equal to -0.0273, which is less than airfoil without a flap, where the drag coefficient is equal to -0.0822, which proves that flap presence is effective in drag force reduction that is favorable in aerodynamics applications.


  1. Dr. Alverta Block DVM

    Can the simulation predict the lift and drag forces on the airfoil?

    • MR CFD Support

      Yes, the simulation provides detailed information about the pressure and velocity distribution around the airfoil, which can be used to calculate the lift and drag forces.

  2. Tiara Ratke

    How does the simulation model the interaction between the airfoil and the surrounding air?

    • MR CFD Support

      The simulation uses the Navier-Stokes equations to model the fluid dynamics around the airfoil. The turbulence is captured using the k-epsilon model, which accurately predicts the flow separation and reattachment around the flap.

  3. Armando Kovacek

    Can the simulation model the effects of different flap angles on the airfoil’s performance?

    • MR CFD Support

      Yes, the flap angle in the simulation can be easily adjusted to study its effects on the lift and drag forces, as well as the stall behavior of the airfoil.

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