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Part IA: We present numerical measurements of relativistic scaling relationsin $(2+1)$-dimensional conformal fluid turbulence, which perform favourablyover their non-relativistic versions. As seen with incompressible turbulence inpast studies, we find that the energy spectrum exhibits $k^{-2}$ scaling ratherthan the Kolmogorov/Kraichnan expectation of $k^{-5/3}$.  Part IB: We compute the fractal dimension $D$ of a turbulent anti-deSitterblack brane reconstructed from boundary fluid data using the fluid-gravityduality. Our value of $D=2.584(1)$ is consistent with the upper bound $D\leq3$, resolving a recent claim that $D=3+1/3$. We describe how to covariantlydefine the fractal dimension of spatial sections of the horizon, and wespeculate on assigning a `bootstrapped' value to the entire horizon.  Part II: We report progress implementing a fluid code with post-Newtonian(PN) gravity in spherical symmetry. The PN formalism couples a fluid, itsself-gravity, and a black hole via elliptic equations. This eliminatesradiative modes, allowing larger time steps, which is helpful for studyingsystems with very long time scales, eg. tidal disruption events.  Part III: Asteroseismology of rotating core-collapse supernovae is possiblewith a multimessenger strategy. We show an $l=2$, $m=0$, $n\gtrsim 2$,$f\lesssim 280$ Hz mode of the core is responsible for emission ingravitational waves and neutrinos. The angular harmonics of the neutrinoemission is consistent with the mode energy around the neutrinospheres, where$r\sim 70$ km. Thus, neutrinos carry information about the mode in the outerregion of the core, whereas gravitational waves probe the deep inner core $r\lesssim 30$ km.

Turbulence, Gravity, and Multimessenger Asteroseismology