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首页> 外文期刊>Plasma physics and controlled fusion >A non-twisting flux tube for local gyrokinetic simulations
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A non-twisting flux tube for local gyrokinetic simulations

机译：用于局部旋转模拟的非扭转磁通管

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Local gyrokinetic simulations use a field-aligned domain that twists due to the magnetic shear of the background magnetic equilibrium. However, if the magnetic shear is strong and/or the domain is long, the twist can become so extreme that it fails to properly resolve the turbulence. In this work, we derive and implement the 'non-twisting flux tube,' a local simulation domain that remains rectangular at all parallel locations. Convergence and runtime tests indicate that it can calculate the heat flux more efficiently than the conventional flux tube. For one test case, it was 30 times less computationally expensive and we found no case for which it was more expensive. It is most advantageous when the magnetic shear is high and the domain includes at least two regions of turbulent drive (e.g. stellarator simulations, pedestal simulations, tokamak simulations with several poloidal turns). Additionally, it more accurately models the inboard midplane when the magnetic shear is large. Lastly, we show how the non-twisting flux tube can be generalized to allow further optimization and control of the simulation domain.
机译：局部回转动力学模拟使用了一个磁场对齐的区域，该区域由于背景磁平衡的磁剪切而扭曲。然而，如果磁切变很强和/或磁畴很长，扭曲可能会变得非常极端，以至于无法正确解决湍流。在这项工作中，我们推导并实现了“非扭曲通量管”，这是一个在所有平行位置保持矩形的局部模拟域。收敛性和运行测试表明，该方法比传统的通量管更能有效地计算热流密度。对于一个测试用例，它的计算成本降低了30倍，我们没有发现比它更昂贵的用例。当磁切变较高且磁畴至少包括两个湍流驱动区域（例如，恒星器模拟、基座模拟、具有多个极向圈的托卡马克模拟）时，这是最有利的。此外，当磁切变较大时，它可以更精确地模拟内侧中平面。最后，我们展示了如何推广非扭曲通量管，以允许进一步优化和控制模拟域。

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