Implicit Large-eddy Simulations of Global Solar Convection: Effects of Numerical Resolution in Nonrotating and Rotating Cases

Abstract Simulating deep solar convection and its coupled mean-field motions is a formidable challenge where few observational results constrain models that suffer from the nonphysical influence of grid resolution. We present hydrodynamic global implicit large-eddy simulations performed with EULAG-MHD code, we explore effects resolution on properties rotating nonrotating convection. The results, based low-order moments turbulent spectra, reveal convergence in may be achieved at resolutions not much higher than these considered here. flow highly anisotropic, energy contained horizontal divergent exceeding their radial counterpart by more three orders magnitude. By contrast, simulations, largest toroidal part motions. As increases, correlations change such way solar-like differential rotation, obtained simulation coarser grid, transitions to an antisolar rotation. reason for this contribution effective viscosity balance forces driving large-scale flows. decreases, angular momentum improves, yet force meridional direction lessens, favoring strong advects toward poles. suggest obtaining correct distribution mere issue numerical Accounting additional physics, as magnetism or near-surface shear layer, necessary simulating interior.