1 Introduction

In this tutorial we will see how to model under-cowl flow around the engine and check the cooling performance. We consider an hybrid UAV, having 4 electric VTOL propellers, and a push propeller driven by a 2 strokes DA100L engine. The UAV has a span of 5 meters. However for this tutorial, to make the computation fast, we will work only on a small part of the geometry : the main fuselage with the wings cut-off. Note that you should avoid doing this to obtain more realistic data, this is just to demonstrate the software features.
 

 

The push propeller, a radiator and an air filter will be modeled in the simulation. Two versions of the engine compartment will be simulated and a more advanced post-processing will be completed.
 

 

The aircraft and engine are broken down into several .stl files to get specific detailed results on each parts. The more specific details you want, the more specific parts you need. Breaking down surfaces in different parts can also allow you to put different meshing conditions on different surfaces, to refine some areas specifically.
 

Please find these stl files in the ACE of Aircraft directory, in the compressed folder named "STLfiles.zip", or use this link : STLfiles.zip.