FRONTIERS IN COMPUTATIONAL ASTROPHYSICS

Particle and Flames in Radiative and Magnetic Flows

October 11-15, 2010
Lyon, France

Contribution of Wolfram Schmidt

Title

Computation of the Turbulent Pressure in Astrophysical Fluid Dynamics

Topics

"Stellar structure and evolution""Explosive fate of stars"

Keywords

turbulence, turbulent pressure, subgrid-scale model, stellar feedback

Abstract

In simulations of turbulent astrophysical flows, the velocity fluctuations below the grid scale act as an energy reservoir between the resolved energy of the flow and the internal energy, which can add a significant contribution to the thermal pressure of the gas. I will discuss a subgrid-scale closure for the computation of the turbulent pressure on the basis of the highly compressible turbulence cascade. This closure can be utilized together with models that account for the numerically unresolved turbulence production by stellar feedback in large-scale galactic and cosmological simulations.

Talk