Learning Forum

[August Glei]

I am new to Ansys working on a project for school. The project consists of changing the dihedral angle of a wing mid-flight with respect to the airspeed. I am able to simulate the design with a dihedral of zero degrees just fine. The next step I want to do is change the dihedral angle with respect to the incoming airspeed. My first idea was import the aircraft with no wings, then import a left and right wing so there are three separate bodies. I created the enclosure and boolean (I also preserved the tool bodies). I meshed the object and named the walls of the wind tunnel, inlet, outlet, right wing, left wing, and fuselage. I also added a patch confirming method for tetrahedrons. (It is good to note that I have tried running this model in fluent with no angle and I am only getting data for one of the wings).

Once I get into fluent is where I am stuck. I have a few ideas how to change the wing angle but I am not sure how they work. My first idea is possibly using the Cell Zone Conditions, then Rotation-Axis Origion and Rotation-Axis Direction, and creating a formula that will move the wings with respect to the incoming airspeed.

Through research I have also found the moving reference frame, but I have no clue how to apply it to the means of my project.

[Rob]

You'd need to move the mesh (mesh motion) as moving reference frame is to mimic motion; good idea but not quite what you're after. So, we'd model the propellors with reference frame but not angle of attack.  Another option is to leave the mesh alone and change the inlet flow vector, have a look at the NACA example(s) in Fluent's Help system.