[kh.aa]

I am working on a 2-D case and I need to set the inlet boundary conditions. The paper* I am working on states the following:

The axial inlet velocity was set to22 m/s in the core region and a δ99= 6.35 mm boundary layer was patched from the edge of the core region to the wall.

What does that mean? Is it a uniform profile for the whole inlet plan or do I need to change something in the boundary layer region?

Thanks.

*Radial and Axial Turbulent FlowMeasurements With an LDV in an Axisym metric Sudden Expansion Air Flow by Durret, 1988

[LuckyTran]

It means take the inlet and split it into two regions: a core region and boundary layer region (which they conveniently give as 6.35 mm). In the core region you use 22 m/s. In the 6.35 mm region nearest the wall, you use some sort of profile. Sorry I'm too lazy to read the paper to figure out exactly what profile they used (but let's say it's a 1/7 power law or sinusoidal or tanh or something). Hope that helps at least.

[kh.aa]

Originally Posted by LuckyTran

It means take the inlet and split it into two regions: a core region and boundary layer region (which they conveniently give as 6.35 mm). In the core region you use 22 m/s. In the 6.35 mm region nearest the wall, you use some sort of profile. Sorry I'm too lazy to read the paper to figure out exactly what profile they used (but let's say it's a 1/7 power law or sinusoidal or tanh or something). Hope that helps at least.

I see. Thank you. That helped