UAV External Airflow CFD Simulation by ANSYS Fluent Software
In this project, the airflow around a drone is simulated.
This ANSYS Fluent project includes CFD simulation files and a training movie.
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UAVs can be considered as small drones. One of the most important advantages of drones is their remote control capability, which has made it particularly popular in the aviation industry, and in the military industry. The design of UAVs requires special care and consideration. Due to the fact that the flight as well as the control of the continuation of the flight in the drones is done through remote control commands, there has been a lot of effort to pay special attention to the structural design of these aircraft in terms of aerodynamics. Simulating the airflow around a UAV is crucial to studying aerodynamic forces and stability, and ultimately good designs. Using simulation software such as ANSYS can significantly reduce the costs of design, construction, and testing of these complicated structures.
In this project, the airflow around a drone is simulated. Due to the high speed of airflow during flight and also the possibility of very high separation in such flows, the standard k-epsilon model with the use of standard wall functions is exploited to analyze the turbulence of the airflow and to better investigate the separation of the current from the surface.
UAV Geometry and Mesh
Considering the high sensitivity in the design of the drone’s body, the initial geometry required for this analysis was generated in CATIA® and completed in Gambit® and also meshed inside Gambit®. The mesh type used for this geometry is unstructured and the element number is 3079338.
CFD Simulation Settings
The assumptions considered in this project are:
- Simulation is done using a pressure-based solver.
- The present simulation and its results are considered to be steady and do not change as a function time.
- The effect of gravity has not been taken into account.
The applied settings are summarized in the following table.
|near-wall treatment||standard wall function|
|Velocity magnitude||30 m/s|
|Turbulent intensity||0.9999999776483 %|
|Hydraulic diameter||2.5 m|
|wall motion||stationary wall|
|turbulent kinetic energy||first-order upwind|
|turbulent dissipation rate||first-order upwind|
|gauge pressure||0 Pa|
|velocity (x,y,z)||(0,30,0) m/s|
|Turbulent kinetic energy||0.135 m2/s2|
|Turbulent dissipation rate||0.0465741 m2/s3|
At the end of the solution, we obtain contours of pressure, velocity, streamlines, and velocity vectors.
All files, including Geometry, Mesh, Case & Data, are available in Simulation File. By the way, Training File presents how to solve the problem and extract all desired results.