Directed percolation process in the presence of velocity fluctuations:   Effect of compressibility and finite correlation time
  The direct bond percolation process (Gribov process) is studied in the presence of random velocity fluctuations generated by the Gaussian self-similar ensemble with finite correlation time. We employ the renormalization group in order to analyze a combined effect of the compressibility and finite correlation time on the long-time behavior of the phase transition between an active and an absorbing state. The renormalization procedure is performed to the one-loop order. Stable fixed points of the renormalization group and their regions of stability are calculated in the one-loop approximation within the three-parameter $(\eps,y,\eta)$-expansion. Different regimes corresponding to the rapid-change limit and frozen velocity field are discussed, and their fixed points' structure is determined in numerical fashion. 
N. V. Antonov, M. Hnati\v{c}, A. S. Kapustin, T. Lu\v{c}ivjansk\'y, L.   Mi\v{z}i\v{s}in
cond-mat.stat-mech physics.flu-dyn