The picture shows the temperature fluctuations in a layer of unstable, turbulent gas (upper half) convecting onto a layer of stable gas (lower half). Thermal plumes inpinging onto the lower layer generate gravity waves, which cause the gas to mix also in the lower, convectively stable region. This process of convective penetration plays a fundamental role for the structure and evolution of stellar interiors. This simulation was performed on the IBM Sp1 at Argonne National Laboratory with 1024x512 grid size.
The numerical code used for these studies combines a higher-order Godunov method with a nonlinear multigrid elliptic solver to advance the equations of compressible hydrodynamics with temperature dependent thermal conduction. The code has been developed for massively parallel MMD architectures using the Chameleon portable message passing system and the BlockComm library developed by W. Group at Argonne National Laboratory. The code has been tested to run efficiently on the Intel Delta at Caltech and on the IBM Sp1 at Argonne National Laboratory.
Authors: Andrea Malagoli, Anshu Dubey, Fausto Cattaneo Department of Astronomy and Astrophysics University of Chicago May 4, 1994 Contact: firstname.lastname@example.org