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Astrophysical Radiation Hydrodynamics
We show that it ~s impossible to simulate numerically all of the length-scales in astrophysical turbulence. We look at the effects of ignoring the unresolvable. small-scale flow. and show how numerical simulations that neglect the subgrid-scale motions produce erroneous solutions. Then we discuss the "quick fix" remedy of introducing a numerical or eddy-viscosity. We sketch how the analytic theories of turbulence attempt to model the large-scale effects of the small-scale motions. In the lastdoi:10.1007/978-94-009-4754-2_11 fatcat:wmwzlr2znja2dhcwgqomvm4pq4