inflation for a 1 mm pipe
 

Hello,

I am currently designing a tube of 1 mm, i have implemented inflation for the model because I will be working on turbulent flow. I am currently looking for a way to verify the mesh. In larger pipes I have seen that you can use y+ values to adjust the mesh. The best value i have gotten so far is y+= 0.4 for an inlet velocity of 18.26 m/s and L = 5D.
I have read that y+ should be between 30 and 300 for turbulent models but in my case a y+ = 30 is impossible to obtain since it will lead to a first element height larder than my geometry. So how can I ensure that my mesh is robust? I will be using k-ω sst for this simulation.

Thank you in advance

kw SST performs well between Yplus 0.1 and 300.
but if the solution is correct, depends on our mesh quality, size, skewness, inlet conditions, etc.

so better plot a few lines to see how velocity, pressure, tke, omega, TED etc develop and see if it converges. Or not.
What is your Reynolds?

You are probably working with air (my quick check with your given boundary conditions) ? If the first layer height is too great, decrease your desired y+ value to around 1. This will resolve your boundary layer and decrease your first layer height enough.