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

Jun Li, Bin Zhao, Hong Li, Jian Zheng2010年Plasma Physics and Controlled FusionIF 2.2出版社

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.

日本語訳

フラックスリミッター(f)のレーザー強度への依存性は、レーザー加熱、電子輸送、イオン流体力学を含むフォッカー・プランク(FP)および流体シミュレーションによって調査される。平面レーザー駆動アブレーション過程は、それぞれFPコードと流体コードによってシミュレートされ、fはそれらの間のアブレーション面の一致に従って得られる。レーザー強度(I)が約10^15 W cm^-2未満の場合、時間に依存しないフラックスリミッターがシミュレーションにおいて適用可能であることが見出された。I > 10^15 W cm^-2の場合、時間依存のフラックスリミッターが必要となる。流体コードとFPコードによって計算されたコロナ温度の一致も、Iが増加するにつれて調査される。流体シミュレーションにおいて臨界密度面近傍での温度ジャンプの発生により、レーザー強度が約5 × 10^14 W cm^-2を超えると、コロナ温度は互いに良好に一致できないことが見出された。

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LimiterAblationFokker-Planck
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