[rj26]

Hello everyone

My question is very rudimentary.

I want to simulate flow through a duct using CFD.

I want to use k-e model with no-slip wall condition.

what is the appropriate wall distance (y+) value required to perform such a condition ?

From my understanding k-e model works for the condition 30<y+<300. But what happens when we use no-slip wall condition. The velocity gradient at the wall becomes zero. So what kind of y+ value is required?

please let me know.

Thank you

[LuckyTran]

What software? What implementation? The devil is in the details...

Originally Posted by rj26

From my understanding k-e model works for the condition 30<y+<300.

This isn't a requirement for the k-epsilon model itself but a condition for a certain wall function which already implies a no-slip wall condition being used.

Originally Posted by rj26

The velocity gradient at the wall becomes zero.

The velocity gradient isn't 0. Zero gradient would be a slip wall.

Look into whatever code you are using and figure out which implementation of k-epsilon you are using and which wall treatment you are using and come back with some more details. Either way, most likely you'll be targeting a very low y+<10 or a in the 30-300 range.