<div dir="ltr"><div><div>Hi,<br><br></div>I'm trying to solve for accretion flows around blackholes using the theta method in TS. The accretion disk is surrounded by a very low density and pressure "atmosphere". The lower the values of the density and pressure in the atmosphere, the harder it is becoming for the nonlinear convergence. Eventually, it leads to diverging linesearches and the time step becomes very small. <br>
<br>Is there a way to deal with very low regions of density and pressure and avoid killing the nonlinear convergence?<br><br></div>Thanks,<br>Mani<br></div>