Numerical Simulations of 3D Compressible Convection

3-D Simulations of Turbulent Compressible Convection

Three{dimensional simulations of turbulent and fully compressible thermal convection in deep atmospheres are presented and analyzed in terms of velocity power spectra, mixing{length theory, and production of vorticity. Density contrasts across these convective layers are typically around 11. The uid model is that of an ideal gas with a constant thermal conductivity. The Piecewise-Parabolic Meth...

Direct Numerical Simulations of Compressible Vortex Flow Problems

Vortical flows are one of the most fascinating topics in fluid mechanics. A particular difficulty of modelling such flows at high Reynolds (Re) numbers is the diversity of space and time scales that emerge as the flow develops. For compressible flows, in particular, there are additional degrees of freedom associated with the shocks and acoustic waves. The latter can have very different characte...

Numerical Simulations of Oscillation Modes of the Solar Convection Zone.

We use the three-dimensional hydrodynamic code of Stein & Nordlund to realistically simulate the upper layers of the solar convection zone in order to study physical characteristics of solar oscillations. Our first result is that the properties of oscillation modes in the simulation closely match the observed properties. Recent observations from the Solar and Heliospheric Observatory (SOHO)/Mic...

Numerical simulations of surface convection in a late M-dwarf

Based on detailed 2D and 3D numerical radiation-hydrodynamics (RHD) simulations of time-dependent compressible convection, we have studied the dynamics and thermal structure of the convective surface layers of a prototypical late-type M-dwarf (Teff ≈ 2800K, log g = 5.0, solar chemical composition). The RHD models predict stellar granulation qualitatively similar to the familiar solar pattern. Q...

Numerical Simulations of Geodynamo and Liquid Metal Convection