[ByronPiper1618]

Currently I am trying to create a boundary layer mesh around an aerofoil using a transfinite surface. I am not using the built-in boundary layer field function as I can't figure out how to terminate it early around a given curve (I don't want the boundary layer to fully enclose the aerofoil in this scenario).

So, instead I have two splines. One is defined by the points that make up the aerofoil surface and another is defined by points that are extruded away from the aerofoil's surface points along their normal vectors. In theory, both curves should be completely orthogonal to each other at each given point.

However, when I try to create a structured mesh using a transfinite surface the vertical lines are not parallel to both splines. They seem to skew somewhat. I would assume this is due to the distances travelled along each spline differing due to the local curvature and extruded distance. To try and combat this, I have messed around with changing the distribution types - progression, bump, etc. - and the coeff to see if they "straighten" up. It does seem to make a difference but I can't figure out how to calculate the correct coeff.

Is this the best approach to this issue or is there a better way?

Thanks.