Boundary+Layer+Velocity+Profile

Boundary-Layer Velocity Profiles
For a two-dimensional viscous flow over an aerodynamic shape, A boundary-layer velocity profile shows how velocity in the x-direction varies as a function of distance in the y-direction above the surface of the aerodynamic shape at a given location. Boundary-layer velocity profiles can be used in the analysis of boundary-layer properties to determine things such as the location of transition from laminar to turbulent flow.

Optima2D can generate a boundary-layer velocity profile at any given location on an airfoil. Interpolated values of velocity in the x-direction are calculated along a vertical line at equally spaced intervals from the airfoil surface to a specified distance. An output file is generated that contains data points for x-direction velocity versus distance y above airfoil surface. See Optima2D Test Suite case 028.

Optima2D Input Parameters
To generate an output file with extension .blvp containing boundary-layer velocity profile data, the following input parameters are required:

V_PROFILE = TRUE; A flag to turn on boundary-layer velocity profile generation V_PROFILE_X = 0.5; The chord location where the velocity profile will be generated V_PROFILE_UPPER = TRUE; A flag to indicate if the velocity profile is on the airfoil upper or lower surface VP_POINTS = 1501; The number of equally spaced points for the velocity profile VP_DIST = 0.03; The distance above the airfoil surface for the velocity profile