June 17, 2021 at 2:26 pm

Emperor

Subscriber

the hybrid initialization gives me a recirculation at the inlet leading to a non uniformity of the pressure field as seen above.

Aitor, Rob thank you because thanks to you I'm learning a lot about CFD and it's getting more and more interesting!

So I patched the input zone to pressure (170b) and the rest of the zones to 0B. I only saw your answer later about the velocity patch, I had already patched the velocity on the output zones v=0.

So I ran the calculation and I can start to appreciate the convergence of some residuals :

I stopped at 500iteration.

The velocity field is uniform and so is the pressure field:

can I appreciate some level of convergence with these elements?

The question I have now is about the y+. I should have a y+ =1 (roughly) but I have the max of y+ = 40 . I plotted the y+ and I noticed that the maximum value 40 is at the ball where there is the restriction of the passage (See image below). Should I reduce the height of the boundary layer in this area? Knowing that my orthogonal quality may decrease (here it is 0.09)?

Aitor, Rob thank you because thanks to you I'm learning a lot about CFD and it's getting more and more interesting!

So I patched the input zone to pressure (170b) and the rest of the zones to 0B. I only saw your answer later about the velocity patch, I had already patched the velocity on the output zones v=0.

So I ran the calculation and I can start to appreciate the convergence of some residuals :

I stopped at 500iteration.

The velocity field is uniform and so is the pressure field:

can I appreciate some level of convergence with these elements?

The question I have now is about the y+. I should have a y+ =1 (roughly) but I have the max of y+ = 40 . I plotted the y+ and I noticed that the maximum value 40 is at the ball where there is the restriction of the passage (See image below). Should I reduce the height of the boundary layer in this area? Knowing that my orthogonal quality may decrease (here it is 0.09)?