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In this study we investigate the effects of turbulent convection on formationof large-scale inhomogeneous magnetic structures by means of Large-EddySimulation (LES) for convection in solar-type stars. The main idea of thisstudy is the implementation of a new subgrid-scale model for the effectiveLorentz force in a three-dimensional nonlinear radiative magnetohydrodynamics(MHD) code developed for simulating the upper solar convection zone and loweratmosphere. To this end we derived the energy budget equations, which includethe effects of the subgrid-scale turbulence on the Lorentz-force, andimplemented the new subgrid-scale turbulence model (TELF-Model) in athree-dimensional nonlinear MHD LES code. Using imposed initial vertical andhorizontal uniform magnetic fields in LES with the TELF-Model, we have shownthat the magnetic flux tubes formation is started when the initial meanmagnetic field is larger than a threshold value (about 100 G). This is inagreement with the theoretical studies by Rogachevskii and Kleeorin (2007). Wehave determined the vertical profiles of the velocity and magneticfluctuations, total MHD energy and anisotropy of turbulent magneto-convection,kinetic and current and cross helicities.

LES of turbulent convection in solar-type stars and formation of large-scale magnetic structures