For a nearly incompressible system, such as an aqueous solution of enantiomers and S, the volume V o and the number density, ρ o = n R + n S + n solvent V o are nearly constant. With a constant vorticity, we can use Eq. ( ) along with Eqs. ( )-( ) to combine our competition model with translational diffusion. This combination can be expressed in matrix form as coupled drift-diffusion equations for the R and enantiomers: