Study of flux limiter using Fokker–Planck and fluid simulations of planar laser-driven ablation

Abstract

The dependence of flux limiters (f) on laser intensity is investigated by Fokker–Planck (FP) and fluid simulations including laser heating, electron transport and ion hydrodynamics. The planar laser-driven ablation processes are simulated by the FP and fluid code, respectively, where f is obtained according to the match of ablation surfaces between them. It is found that a constant flux limiter in time is applicable in the simulations when laser intensity (I) is below ∼1015 W cm−2. When I > 1015 W cm−2, a time-dependent flux limiter is required. The match of corona temperatures computed by the fluid and FP code is also investigated as I increases. It is found that corona temperatures cannot agree well with each other at laser intensities above ∼5 × 1014 W cm−2 due to the occurrence of a temperature jump near the critical surface in fluid simulation.