Self-Convergence of Radiatively Cooling Clumps

Details Self-Convergence of Radiatively Cooling Clumps Self-Convergence of Radiatively Cooling Clumps

2009-12-24

arxiv.org/abs/0912.4777v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

24 pages, 7 figures. Submitted to the Astrophysical Journal

Scientific paper

Numeric convergence studies demonstrate that the evolution of an adiabatic clump is well-captured by roughly 100 cells per clump radius. The presence of radiative cooling, however, imposes limits on the problem due to the removal of thermal energy. Numerical studies which include radiative cooling typically adopt the 100--200 cells per clump radius resolution. In this paper we present the results of a convergence study for radiatively cooling clumps undertaken over a broad range of resolutions, from 12 to 1,536 cells per clump radius, employing adaptive mesh refinement (AMR) in a 2D axisymmetric geometry ("2.5D"). We also provide a fully 3D simulation, at 192 cells per clump radius, which supports our 2.5D results. We find no appreciable self-convergence at ~100 cells per clump radius as small-scale differences owing to increasingly resolving the "cooling length" have global effects. We therefore conclude that self-convergence is an insufficient criterion to apply on its own when addressing the question of sufficient resolution for radiatively cooled shocked clump simulations. We suggest the adoption of alternate criteria to support a statement of sufficient resolution, such as the demonstration of adequate resolution of the cooling layers behind shocks. We discuss an associated refinement criteria for AMR codes.

Affiliated with

Also associated with

No associations

Rating

Self-Convergence of Radiatively Cooling Clumps does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Self-Convergence of Radiatively Cooling Clumps, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Self-Convergence of Radiatively Cooling Clumps will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-554990