论文标题
超越Oberbeck-Boussinesq和长波长近似
Beyond the Oberbeck-Boussinesq and long wavelength approximation
论文作者
论文摘要
我们介绍了还原磁化等离子体模型的第一个模拟，该模型既包含了任意波长极化和非Oberbeck-Boussinesq效应。据报道，这两种影响对互换斑点的密度，电势和EXB涡度以及非线性动力学的显着影响。任意波长极化意味着与长波长近似相比，所谓的陀螺仪扩增会导致高度放大的小尺度EXB涡度波动。这些强烈提高了斑点的相干性和寿命，并通过较慢的斑点分解改变了斑点的运动。非贝贝克 - 贝斯西尼克效应融合了血浆惯性，从而大大降低了高振幅斑点的生长速率和线性加速度，而最大斑点速度不影响最大的斑点速度。最后，我们概括和数字验证统一的缩放定律，以验证斑点速度，加速度和生长速率，包括离子温度和任意斑点幅度依赖性。
We present the first simulations of a reduced magnetized plasma model that incorporates both arbitrary wavelength polarization and non-Oberbeck-Boussinesq effects. Significant influence of these two effects on the density, electric potential and ExB vorticity and non-linear dynamics of interchange blobs are reported. Arbitrary wavelength polarization implicates so-called gyro-amplification that compared to a long wavelength approximation leads to highly amplified small-scale ExB vorticity fluctuations. These strongly increase the coherence and lifetime of blobs and alter the motion of the blobs through a slower blob-disintegration. Non-Oberbeck-Boussinesq effects incorporate plasma inertia, which substantially decreases the growth rate and linear acceleration of high amplitude blobs, while the maximum blob velocity is not affected. Finally, we generalize and numerically verify unified scaling laws for blob velocity, acceleration and growth rate that include both ion temperature and arbitrary blob amplitude dependence.
