Home > Legacy archive > Specific versions > FARGO-ADSG > FARGO-SG > Anisotropic pressure model

As shown by [[Baruteau, C. & Masset, F. 2008, Accepted for publication in ApJ]], the non-axisymmetric component of the disk self-gravity can be modeled with an anisotropic pressure tensor. This model multiplies the azimuthal pressure gradient in susbtep1 by an anisotropy coefficient, whose value is calculated with function compute_anisotropic_pressurecoeff in aniso.c. This anisotropy coefficient reads \alpha = 1 - \beta / Q, with Q the Toomre parameter at the planet's orbital radius, and \beta a parameter that depends only on the softening length to disk scale heigth ratio \eta. The parameter \beta has been calculated only for \eta = 0.1, 0.3 and 0.6. The model can be activated by writing: SelfGravity Z ### and not Yes ZMPlus Yes in your parameter file.

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