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首页> 外文期刊>Plasma physics and controlled fusion >Characterization of predator-prey dynamics, using the evolution of free energy in plasma turbulence
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Characterization of predator-prey dynamics, using the evolution of free energy in plasma turbulence

机译：利用等离子体湍流中自由能的演化来刻画捕食者-猎物的动力学

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摘要

A simple dynamical cascade model for the evolution of free energy is considered in the context of gyrokinetic formalism. It is noted that the dynamics of free energy, that characterize plasma micro-turbulence in magnetic fusion devices, exhibit a predator-prey character. Various key features of predator-prey dynamics such as the time delay between turbulence and large-scale flow structures, or the intermittency of the dynamics are identified in the quasi-steady-state phase of the nonlinear gyrokinetic simulations. A novel prediction on the ratio of turbulence amplitudes in different parts of the wavenumber domain that follows from this simple predator-prey model is compared to a set of nonlinear simulation results and is observed to hold quite well in a large range of physical parameters. Detailed validation of the predator-prey hypothesis using nonlinear gyrokinetics provides a very important input for the effort to apprehend plasma micro-turbulence, since the predator-prey idea can be used as a very effective intuitive tool for understanding and designing efficient transport models.
机译：在陀螺动力学形式主义的背景下，考虑了一个简单的动态自由级联动力学模型。应当指出，表征磁聚变装置中的等离子体微湍流的自由能的动力学表现出食肉动物-猎物的特征。捕食者-猎物动力学的各种关键特征，例如湍流和大规模流动结构之间的时间延迟，或动力学的间歇性，都在非线性陀螺动力学模拟的准稳态阶段得到识别。从这个简单的捕食者－猎物模型得出的关于波数域不同部分湍流振幅比的新颖预测与一组非线性仿真结果进行了比较，并且观察到在很大范围的物理参数中具有很好的适应性。使用捕食者-猎物的想法可以用作理解和设计有效运输模型的非常有效的直观工具，因此使用非线性运动学对捕食者-猎物的假设进行详细的验证为了解血浆微湍流提供了非常重要的信息。

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