Numerical study of influence of J × B force on melt layer under conditions relevant to ITER ELMs

• 来源期刊: 中国物理B（英文版）
• 关键词: ELMs tungsten divertor plates J × B force melt motion
• 年，卷（期）: 2019,（4）
• 页码范围: 254-260
• 页数: 7页
• 语种: 英文
• DOI: 10.1088/1674-1056/28/4/045201

摘要

The influence of the J × B force on the topographical modification of W targets during a type-I-like ELM in ITER has been studied numerically.A two-dimensional (2D) fluid dynamics model is employed by solving liquid hydrodynamic Navier-Stokes equation with the 2D heat conduction equation in addition to driving forces for surface topography,such as surface tension and pressure gradient,the J × B force is particularly addressed.The governing equations are solved with the finite volume method by adequate prediction of the moving solid-liquid interface.Numerical simulations are carried out for a range of type-I ELM characteristic parameters.Our results indicate that both the surface tension and the J × B force contributes to the melt motion of tungsten plates when the energy flux is under 3000 MW.m-2,the surface tension is a major driving force while the pressure gradient is negligible.Our results also indicate that the J × B force makes the small hills grow at different rates at both the crater edges under a type-I-like ELM heat load with a Gaussian power density profile.