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Dynamical aspect of entropy transfer in free convection turbulence
| Title: | Dynamical aspect of entropy transfer in free convection turbulence |
| Authors: | Toh, Sadayoshi Browse this author | | Iima, Makoto Browse this author →KAKEN DB |
| Issue Date: | Mar-2000 |
| Publisher: | The American Physical Society |
| Journal Title: | Physical Review E |
| Volume: | 61 |
| Issue: | 3 |
| Start Page: | 2626 |
| End Page: | 2639 |
| Publisher DOI: | 10.1103/PhysRevE.61.2626 |
| Abstract: | From a dynamical perspective, entropy transfer processes are investigated in two-dimensional free convection turbulence in comparison with an entropy cascade picture based on the coupled dynamics of the T vorticity χ≡(∂yT,-∂xT) and the velocity gradient tensor. Typical entropy transfer processes are observed in direct numerical simulations. For these processes, two characteristic times, the transfer time and the staying time are determined: the former time obeys a Bolgiano-Obukhov (BO) time scaling corresponding to the eddy turnover time in energy cascade. It is suggested that this typical transfer process is not an elementary process of cascade but a dynamical manifestation of intermittency. To examine the meaning of the characteristic times of the typical entropy transfer process, a shell model is constructed based on the entropy cascade picture. By this model, it is shown numerically that typical entropy transfer processes are regarded as the fluctuations satisfying a dynamical similarity. This similarity proved by perturbation analysis requires naturally that the transfer time should obey the BO time scaling. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/44434 |
| Appears in Collections: | 電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 飯間 信
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