The boundary layer effects of testing in a wind tunnel may cause unwanted effects. These induced artificial effects can be mitigated and reduced by a variety of methods, as shown in more detail below:

Moving Ground Planes, Rolling Roads

Boundary Layer Removal Systems

In other cases, the model may need to be moved up or down relative to the test section floor to better simulate landing / take-off situations. Solutions for this could include:

Ground-Up Test Section floors

Model-Down systems