Figure 2
From: Activity induces traveling waves, vortices and spatiotemporal chaos in a model actomyosin layer

Spontaneous flow.
Steady-state polarity and velocity fields for (α/αc) = 3 after a long time t = 400. The polarity field is indicated by cylindrical rods. The Franck free-energy density of the polarity field (Eq. 5) is color coded. In the velocity plot, the arrows denote local velocity normalized by the maximum magnitude of velocity across the computational domain. The direction of the arrows therefore indicate the local flow direction and the length of the arrows indicates the relative magnitude of velocity. The local speed of flow is color coded. See Sec. Model for model details and Sec. Model Parameters in Sec. Methods for the parameters used to simulate the model. The horizontal direction towards the right is the positive x-direction and the vertical direction towards the top is the positive y-direction.