I am working with Phil Hopkins and Jono Squire on dust instabilities in magnetized plasmas, the magnetic resonant drag instabilities (Seligman, Hopkins and Squire, submitted).

Here is a video of a GIZMO simulation of the magnetic RDI.

Volume-weighted rms standard deviation of various gas and dust properties vs.\ simulation time. We broadly denote three regimes in time: (i) linear, (ii) early nonlinear, and (iii) saturation. In (i), growth rates are rapid and agree reasonably well with the expectation from linear theory }) for a mix of modes. In (ii) growth continues but at decreasing rates until saturating in (iii). There is strong anisotropy between fluctuations in gas velocity and magnetic field. But for each component, the gas velocity and magnetic field fluctuations are tightly-coupled, especially perpendicular to the magnetic field.

Volume-weighted rms standard deviation of various gas and dust properties vs.\ simulation time. We broadly denote three regimes in time: (i) linear, (ii) early nonlinear, and (iii) saturation. In (i), growth rates are rapid and agree reasonably well with the expectation from linear theory }) for a mix of modes. In (ii) growth continues but at decreasing rates until saturating in (iii). There is strong anisotropy between fluctuations in gas velocity and magnetic field. But for each component, the gas velocity and magnetic field fluctuations are tightly-coupled, especially perpendicular to the magnetic field.

Here is a talk I gave at the CCA about this project!