Learning Forum

[Nicola Menga]

Hello everyone,

I'm attempting to simulate the flow around a wing airfoil using a steady-state, 2D simulation. In the mesh creation, I employ edge sizing with "Number of elements" option for the airfoil edge.

During various simulations, I've observed a potentially unusual behavior. I obtain a solution in cl and cd computation, but when I refine the mesh around the airfoil by increasing the number of elements on the airfoil edge (thus keeping y+ constant), the calculation diverges, and the solver does not reach a solution.

Is this normal? I thought that densifying the mesh would lead to more accurate results until a certain point, beyond which the values of cl and cd computed would remain constant with the increasing mesh density.

I hope the question is clear.

Thank you.

Nicola Menga. 😁

[Federico Alzamora Previtali]

Yes, you should expect grid refinement to improve accuracy of results, but factors other than only cell count may come into play.

How does your mesh quality compare between grid refinements?

[Nicola Menga]

What do you mean with "Mesh quality"?
The values of Aspect Ratio, Skewness and Orthogonal quality?

[Federico Alzamora Previtali]

Yes, all of those