## Fluids

#### How to set the range of angles of attack in the aerodynamic calculation?

• javat33489
Subscriber

Hello colleagues. Can you please tell me how to set the range of angles of attack in the aerodynamic calculation? And how then to display the graph in the postprocessor? There is no information about this in the tutorial. There is only one angle of attack indicated. If the model is three-dimensional and the model is located so that the air flows around the model along the Z axis and the Y axis goes up. So I set the angle in these planes (as cos and sin)?

Ansys Employee
Either you rotate geometry itself with respect to domain or you can give velocity components at the inlet.
Please go through help manual for more details
Regards Keyur
Guidelines on the Student Community

• javat33489
Subscriber
You didn't understand my question. I saw tutorials. And I have questions.
1. How to set the angle of attack not one but several, for example, from 1 to 10?
2. How to display the graph of the angles of attack from the resistance force in the postprocessor after the calculation?
3. Why, when setting the angle of attack, the tutorial says that you need to specify the angle in two planes? For example, if I have a 3D model, the nose of the aircraft is along the z-axis, can I set the angle of attack only along the z-axis?

• Rob
Ansys Employee
If you need to run a parametric sweep you'll need to work out the coordinates and run a number of simulations. You'll then have some sets of results to post process.
The angle is what you define, I don't think there's an easy way to add that to the results. Annotations etc aren't designed for that (yet).
How would you only have one angle? With vector components you'd have to set a minimum of two components, we don't set an angle in the solver, we set velocity vectors. If you build the geometry to have an angle you can update that, then the mesh and finally have the flow aligned with x, y and z but misalign the wing. Both work, but the geometry approach means remeshing so is less efficient.
• javat33489
Subscriber
Thanks Rob! I also started watching parametric research. I think this will help me!
• javat33489
Subscriber
Tell me please. The tutorial says that to calculate aerodynamics, you need to use the SA model.
On the forums, people write that you need to use SST or K-eps.
Where is the truth?
How to determine when to use which?
In addition, each model has its own Y +?
Where to see what Y + for each model?