Fig. 12

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Effect of size distribution on azimuthal asymmetry and ring viscosity. Upper frames: Aasym and ∆θmin in the case of strong (rh = 0.80) and weak (rh = 0.61) self-gravity. The width of size distribution is varied, while keeping τdyn and Σ fixed by a suitable choice of Rmin and Rmax (see Appendix A). Filled circles indicate overstable simulations. Lower frames: total viscosities and various contributions to viscosity as a function of W, for weak (left) and strong (right) self-gravity. Box symbols denote νgrav calculated from density autocorrelation function (see Appendix B). The viscosities are normalised with ΩRo2 where Ro in the case of size distribution denotes the identical particle size, R, that yields the same τdyn and Σ. Dashed lines in the right axis indicate the νɡrav from Daisaka et al. (2001) viscosity formula, Eq. (14). In all simulations τdyn = 1, ϵn = 0.1.
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