| BEM | blade-element momentum |
| CFD | computational fluid dynamics |
| DOE | U.S. Department of Energy |
| Fv | core radius factor |
| t | time |
| FVW | free vortex wake |
| N | number of rotor revolutions before wake cutoff condition |
| r⃗ | vector between point of interest and vortex segment |
| r⃗(ψ, ζ) | position vector of Lagrangian markers |
| rc | core radius |
| rc0 | initial core radius |
| OLAF | cOnvecting LAgrangian Filaments |
| α | numerical constant = 1.25643 |
| Γ | circulation strength |
| δ | measure of viscous diffusion |
| ϵ | measure of strain |
| Δψ | step size for blade rotation |
| Ω | rotational speed of wind turbine |
| ζ | vortex wake age |
| ζ0 | vortex wake age offset |
| ν | kinematic viscosity |
| ψ | azimuth blade position |