Numerical Experiments Using a Convective Flux Limiter on a Turbulent Single-Mode Rayleigh-Taylor Instability

Cloutman, L. D.

Lawrence Livermore National Laboratory

关键词: Numerical Solution;    Turbulent Flow;    Storage;    36 Materials Science;    Simulation;   

DOI  :  10.2172/793972
RP-ID  :  UCRL-ID-139735
RP-ID  :  W-7405-Eng-48
RP-ID  :  793972

美国|英语

来源: UNT Digital Library

【 摘 要 】

Direct numerical simulation and large eddy simulations are powerful tools for studying turbulent flows. Unfortunately, they are computationally demanding in terms of run times, storage, and accuracy of the numerical method used. In particular, high order methods promise high accuracy on a given grid, but they often fail to deliver the expected accuracy due to dispersive truncation errors that appear as unphysical oscillations in the numerical solutions. This report describes a nonlinear flux limiter that has been applied to the second-order tensor viscosity method and markedly reduces the dispersive truncation errors. A Rayleigh-Taylor instability is simulated to show how well the flux limiter works.