DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Sung, Hyung Jin | - |
dc.contributor.advisor | 성형진 | - |
dc.contributor.author | Han, Juhyung | - |
dc.date.accessioned | 2019-08-28T02:43:47Z | - |
dc.date.available | 2019-08-28T02:43:47Z | - |
dc.date.issued | 2019 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=843053&flag=dissertation | en_US |
dc.identifier.uri | http://hdl.handle.net/10203/265881 | - |
dc.description | 학위논문(석사) - 한국과학기술원 : 기계공학과, 2019.2,[iv, 30 p. :] | - |
dc.description.abstract | Direct numerical simulation data from a turbulent minimal pipe flow is used to explore the spanwise behavior of large-scale motions (LSMs) at $Re_{\tau}$ = 927, 1990, and 2916. A streamwise-minimal unit with a streamwise domain length ($L_x^{+}$ = 1000) is chosen to extract the spanwise behavior of LSMs effectively, and the minimal simulation exhibits well-established spanwise organization of LSMs. The important spanwise behaviors in high Reynolds number turbulent pipe flow are the self-similarity of energy-containing motions and two outer peaks in pre-multiplied spanwise energy spectra of streamwise velocity fluctuations (u). In this present study, we observed that these behaviors are mainly arisen from the wall-attached structures. The conditional two-point correlation represents that the outer peaks in energy spectra are strongly related with attached structures. In particular, the reconstructed pre-multiplied spanwise energy spectra of $u^{2D}$, which is the time evolution of streamwise-averaged u, showed that the two outer peaks are mainly contributed by the tall and wide attached $u_{2D}$ structures ($l_y$ > 0.2). The spanwise scales of attached $u^{2D}$ structures reveal a linear growth with respect to the distance from the wall, which supports the self-similar behavior of energy-containing motions. In addition, the enhanced attached u structures have strong connection with the near-wall region, affecting the spanwise movement of near-wall structures and the near-wall turbulent kinetic energy | - |
dc.description.abstract | the top-down influence of LSMs. | - |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | Direct numerical simulation▼aturbulent pipe flow▼alarge-scale motions▼aspanwise behavior | - |
dc.subject | 직접수치모사▼a난류 파이프 유동▼a대형 구조▼a횡 방향 거동 특성 | - |
dc.title | Spanwise behavior of large-scale motions in turbulent minimal pipe flow | - |
dc.title.alternative | 미니멀 파이프 유동 내 대형 구조의 횡 방향 거동 특성 | - |
dc.type | Thesis(Master) | - |
dc.identifier.CNRN | 325007 | - |
dc.description.department | 한국과학기술원 :기계공학과, | - |
dc.contributor.alternativeauthor | 한주형 | - |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.