[@cuc1] and was in some sense based on the paper by Viscek [@vic] from 1995 in which a model of flocking was introduced, such that each particle adjusted it’s velocity with respect to the avarage velocity of it’s neighbors. Since then existence, uniqueness, asymptotics and stability for alignment models similar to C-S (both in continuous and discrete cases) were extensively studied, both from physical and biological point of view [@deg1] -[@deg4], [@le], [@park] - [@topaz] and from more theoretical point of view [@aha1; @aha2], [@bocan] - [@cuc4], [@dua1] - [@halaruslem], [@ka; @mo]. A nice and thorough study of the C-S flocking model with a bounded communication weight can be found in [@hatad], where the interplay between dicrete and continuous model is studied with measure valued solutions of the Vlasov type equation (\[cscont\]) or in [@haliu], where the authors present a new, simple aproach to the problem of existence and asymptotics. Recently other direction of studies was introduced - namely to couple a continuous C-S model treated as a Vlasov equation with Navier-Stokes system to model the motion of fluid imbeded particles. This approach is based on the paper by Beduin [@org] and can be found in [@bae].

Singular communication weight 