Energetics in MRI driven Turbulence
Energetics in MRI driven Turbulence
复制标题
MRI 驱动的湍流中的能量学
DOI：
10.1063/1.2077209
复制
发表时间：
2005
期刊：
影响因子：
--
通讯作者：
J. Stone
中科院分区：
文献类型：
--
作者：
T. Gardiner;J. Stone
在这些会议中，我们提出了最近的努力，以了解由磁旋转不稳定性（MRI）驱动的磁流体动力学（MHD）湍流的能量。这些研究进行了本地（剪切盒）近似使用雅典娜模拟代码。Athena是一种基于分段抛物方法（PPM）、角点传输迎风（CTU）积分算法和用于演化磁场的约束传输（CT）算法的高阶Goddom算法。该算法是特别适合于这些研究，由于一个Goddom计划的守恒性质和剪切盒源项的具体实施在这里使用。我们提出了各种计算，可以直接与以前发表的结果进行比较，并讨论它们的一些细节。在这里提出的结果和发表的文献中发现的唯一显着差异涉及湍流加热速率。我们观察到存在经常性的通道解决方案的计算涉及平均垂直磁场和相关的时间滞后之间的能量注入和热化率。我们还提出了剪切盒计算的结果，其中包括一个光学薄的辐射项与冷却速率选择匹配的湍流加热速率。我们发现在所有的计算中一致存在的一些性质是可压缩波动、螺旋波和弱激波。结果发现，这些可压缩模式占主导地位的时间波动的概率分布函数的大多数的热力学变量，只有特定的熵是相对免疫的影响。在这些程序中，我们提出了最近的努力，以了解能量的磁流体动力学（MHD）湍流驱动的磁旋转不稳定性（MRI）。这些研究进行了本地（剪切盒）近似使用雅典娜模拟代码。Athena是一种基于分段抛物方法（PPM）、角点传输迎风（CTU）积分算法和用于演化磁场的约束传输（CT）算法的高阶Goddom算法。该算法是特别适合于这些研究，由于一个Goddom计划的守恒性质和剪切盒源项的具体实施在这里使用。我们提出了各种计算，可以直接与以前发表的结果进行比较，并讨论它们的一些细节。在这里提出的结果和发表的文献中发现的唯一显着差异涉及湍流加热速率。我们观察到存在的经常性通道解决方案.
In these proceedings we present recent efforts to understand the energetics of magneto‐hydrodynamic (MHD) turbulence driven by the magneto‐rotational instability (MRI). These studies are carried out in the local (shearing box) approximation using the Athena simulation code. Athena is a higher order Godunov algorithm based on the piecewise parabolic method (PPM), the corner transport upwind (CTU) integration algorithm, and the constrained transport (CT) algorithm for evolving the magnetic field. This algorithm is particularly suited for these studies owing to the conservation properties of a Godunov scheme and the particular implementation of the shearing box source terms used here. We present a variety of calculations which may be compared directly to previously published results and discuss them in some detail. The only significant discrepancy found between the results presented here and in the published literature involves the turbulent heating rate. We observe the presence of recurrent channel solutions in calculations involving a mean vertical magnetic field and the associated time lag between the energy injection and thermalization rate. We also present the results of a shearing box calculation which includes an optically thin radiative term with a cooling rate selected to match the turbulent heating rate. Some properties which we find uniformly present in all of the calculations presented here are compressible fluctuations, spiral waves and weak shocks. It is found that these compressible modes dominate the temporal fluctuations in the probability distribution functions for most of the thermodynamic variables; only the specific entropy is relatively immune to their effects.In these proceedings we present recent efforts to understand the energetics of magneto‐hydrodynamic (MHD) turbulence driven by the magneto‐rotational instability (MRI). These studies are carried out in the local (shearing box) approximation using the Athena simulation code. Athena is a higher order Godunov algorithm based on the piecewise parabolic method (PPM), the corner transport upwind (CTU) integration algorithm, and the constrained transport (CT) algorithm for evolving the magnetic field. This algorithm is particularly suited for these studies owing to the conservation properties of a Godunov scheme and the particular implementation of the shearing box source terms used here. We present a variety of calculations which may be compared directly to previously published results and discuss them in some detail. The only significant discrepancy found between the results presented here and in the published literature involves the turbulent heating rate. We observe the presence of recurrent channel solution...