[@Arash]

Hi to all,

I am working on a 3D airfoil. Currently, I am doing a mesh independence study to assess the dependence of the simulation results.
For this purpose, I plot the two parameters CL and CD when calculating. My solver is Fluent and I use K-W SST turbulence model. My mesh is the structure that I produced in icem-cfd.
I first started with a 552K cell mesh with Y+ <1 , and the residuals converged very well. which is according to the following figure:

w1.PNG

Now, I increased the number of grid cells to 1,263,000 cells, but unfortunately, this time, the residuals fluctuate strongly and do not intend to converge, and I also receive the message (Stabilizing pressure coupled to enhance linear solver robustness.) repeatedly when solving, which is as follows:

y3.PNG

I really wonder why this is happening. To create a new mesh, I did not change the growth rate of the block lines at all, and only increased the number of nodes of the block lines, and at the end, I checked the mesh quality parameters, which were very good.

I was very tired and disappointed.

what is happening? Can anyone help me to solve the problem?

If someone helps me, I will thank you a thousand times and I wish him health and well-being from the bottom of my heart.

Regards

[onurserdarcan]

Hi Arash
I'm currently working on airfoil analysing and what I did is exactly the same as yours. I'm exhausted too. Did you solve the problem of yours?