I would like to calculate the drag of my ellipse with an extra shape in front.
Not having much knowledge in CFD, I work slowly using all possible help.
Today I think I have finished the mesh and the preparation of the simulation. However before starting the calculation, I would like to have the opinion of the community about my settings because I am not sure of everything.
The links to my project is as follows:
Thank you in advance,
Is this supposed to be a 3D or 2D case?
I would like to make a 2D case.
You have a lot of nodes for such a small object. You might want to decrease the refinement at some points as you have over 8 million nodes now as the coarsest mesh which is still a little overkill. Ideally you’re looking at say a million nodes but you can afford extra nodes due to the computing power available.
Do note you should have a y+ of 30 to 200 for a wall function approach while for a full resolution y+ should ideally be less than 1 but LES is computationally very expensive so you might want to just use a wall function and stick to the less expensive y+ of 30 to 200. I see that you’ve done a proper BL inflation for Mesh 3 so lets see how that goes.
If you want to significantly decrease the number of nodes and increase simulation time I suggest doing what I’ve done [here] for my compressible project and using Tet mesh with an extruded plate containing a hole that represents your shape instead. Although note that I’ve been running into strange problems with compressible flow but it doesn’t hurt to try.