论文标题
偶极子和二维湍流
Dipoles and streams in two-dimensional turbulence
论文作者
论文摘要
遵循蒙特 - 卡洛实验的建议。 2020），偶极子对衰减二维湍流的动力学与单个涡流核一样重要，发现该流的动能是由偶极辅导形成的延长流携带的。涡流分成一个小型快速移动的核心，另一个较大的缓慢移动的家族，可以将其描述为“冷冻”成一个缓慢发展的``晶体''。两个家庭的运动学都非常不同，只有前者是自相似的。后者负责流动的大多数动能，其涡旋形成偶极和溪流。讨论了该缓慢成分的生长机制。
Following the suggestion from the Monte--Carlo experiments in Jiménez, J. of Turbul. 2020), that dipoles are as important to the dynamics of decaying two-dimensional turbulence as individual vortex cores, it is found that the kinetic energy of this flow is carried by elongated streams formed by the concatenation of dipoles. Vortices separate into a family of small fast-moving cores, and another family of larger slowly moving ones, which can be described as `frozen' into a slowly evolving `crystal'. The kinematics of both families are very different, and only the former is self-similar. The latter is responsible for most of the kinetic energy of the flow, and its vortices form the dipoles and the streams. Mechanisms are discussed for the growth of this slow component.
