Lubrication Correction only works for R=1.0

[biermanncarl]

We tested the lubrication correction and can verify it at least in one simple test scenario, where two spheres are pushed together. The following image shows the SD velocity (FTS and Lubrication Correction active) compared to two different Sweeps made with COMSOL. The "uniform velocity" approach should be able to produce the same results as SD even in the far field. However, this sweep was just a quick and dirty one with inappropriate settings for large sphere separations.

However, this does only work for spheres with Radius equal to 1. The general case still needs to be implemented.
Also, other scnenarios have to be tested, as well. Especially those that involve rotation.