A new DNS algorithm for rotating homogeneous decaying turbulence

✍ Scribed by Y. Morinishi; K. Nakabayashi; S.Q. Ren

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 571 KB
• Volume: 22
• Category: Article
• ISSN: 0142-727X
• DOI: 10.1016/s0142-727x(00)00067-9

✦ Synopsis

A new algorithm for simulating homogeneous decaying turbulence in an incompressible ¯uid subjected to uniform system rotation has been proposed. The integral factor technique has been extended to the Coriolis term. Since the Coriolis term is integrated analytically in the algorithm, the time increment is not restricted by the system rotation. It is veri®ed that the new algorithm is eective at strong rotation. With this new algorithm, DNS of the homogeneous decaying turbulence is carried out to investigate the eects of the system rotation on the turbulence. The DNS results show that the system rotation inhibits the decay of the kinetic energy. The rotation induces an anisotropic distribution of the kinetic energy between the pole and the equator in wave space and elongates the vortical structure along the rotation axis in physical space. However, this rotation eect is only apparent at moderate rotation.