On the stabilizing effect of swimming in an active suspension. (English) Zbl 1527.35256
Summary: We consider a kinetic model of an active suspension of rodlike microswimmers. In certain regimes, swimming has a stabilizing effect on the suspension. We quantify this effect near homogeneous isotropic equilibria \(\overline{\psi} = \mathrm{const}\). Notably, in the absence of particle (translational and orientational) diffusion, swimming is the only stabilizing mechanism. On the torus, in the nondiffusive regime, we demonstrate linear Landau damping up to the stability threshold predicted in the applied literature. With small diffusion, we demonstrate nonlinear stability of arbitrary equilibrium values for pullers (front-actuated swimmers) and enhanced dissipation for both pullers and pushers (rear-actuated swimmers) at small concentrations. On the whole space, we prove nonlinear stability of the vacuum equilibrium due to generalized Taylor dispersion.
MSC:
| 35Q35 | PDEs in connection with fluid mechanics |
| 35Q92 | PDEs in connection with biology, chemistry and other natural sciences |
| 76Z10 | Biopropulsion in water and in air |
| 92C17 | Cell movement (chemotaxis, etc.) |
| 76T20 | Suspensions |
| 76E30 | Nonlinear effects in hydrodynamic stability |
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