Effects of a Premixed Layer on the Richtmyer-Meshkov Instability

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2011,（11）
• 页码范围: 155-157
• 页数: 3页
• 语种: 英文
• DOI: 10.1088/0256-307X/28/11/114701

摘要

The effects of a premixed layer on the Richmyer-Meshkov instability (RMI) are studied by setting a density gradient for the first shocked fluid in the RMI problems.The RMI with initial density gradients are simulated by using a high resolution arbitrary Lagrangian-Eulerian method.The effects of density gradient and gradient width are analyzed on the basis of the simulation results for the shock from a light fluid to a heavy fluid and for the shock from a heavy fluid to a light fluid.Overall,the premixed layer can suppress the perturbation growth,and the detailed effects are different depending on the detailed premixed configuration.The width of the premixed layer has a very light influence on the perturbation,while the density gradient has quite a significant effect on two kinds of RMIs.The instability of a material interface under an acceleration by an incident shock was predicted theoretically by Richtmyer in 1960.Ten years later,Meshkov confirmed experimentally Richtmyer's prediction.Since then,this interfacial instability has been referred as the Richtmyer-Meshkov instability (RMI).[1-11] Such instabilities are observed in supernovae explosions and inertial confinement fusion (ICF),and are thus of great importance to science and technology.Extensive theoretical and experimental studies of the RM instability have been carried out in the last three decades.With the advent of computer technology and increasing computing power,numerical studies of the RM instability have become very common.