Statistical properties of a coherent structure function for homogeneous isotropic turbulence and turbulent channel flows

Hiromichi Kobayashi; Yasuhiro Tominaga; Taisuke Kubota; Mamoru Tanahashi; Toshio Miyauchi

Statistical properties of a coherent structure function for homogeneous isotropic turbulence and turbulent channel flows

Hiromichi Kobayashi, Yasuhiro Tominaga, Taisuke Kubota, Mamoru Tanahashi, Toshio Miyauchi

法学部共通

研究成果: Paper › 査読

抄録

Statistical properties of a coherent structure function F_CS are investigated using DNS data for homogeneous isotropic turbulence and turbulent channel flows. The function F_CS is defined as the second invariant Q of a velocity gradient tensor normalized by the magnitude E of the velocity gradient tensor. In homogeneous isotropic turbulence, the probability density function (pdf) of F_CS shows good agreement at different Reynolds number. The volume fraction of positive Q and the average of F_CS converge to a certain value at high Reynolds number. For the turbulent channel flows, the pdf of F_CS at different Reynolds number coincides very well at the distance from the wall in wall units. The profiles of the conditional average of positive and negative Q, the volume fraction, and the near-wall F_CS ² are in good agreement at different Reynolds number and those profiles are given as a function of the distance from the wall in wall units.

本文言語	English
ページ	335-340
ページ数	6
出版ステータス	Published - 2009 1 1
イベント	6th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2009 - Seoul, Korea, Republic of 継続期間: 2009 6 22 → 2009 6 24

Other

Other	6th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2009
Country	Korea, Republic of
City	Seoul
Period	09/6/22 → 09/6/24

ASJC Scopus subject areas

Fluid Flow and Transfer Processes

フィンガープリント「Statistical properties of a coherent structure function for homogeneous isotropic turbulence and turbulent channel flows」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル

Statistical properties of a coherent structure function for homogeneous isotropic turbulence and turbulent channel flows. / Kobayashi, Hiromichi; Tominaga, Yasuhiro; Kubota, Taisuke; Tanahashi, Mamoru; Miyauchi, Toshio.

2009. 335-340 Paper presented at 6th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2009, Seoul, Korea, Republic of.

研究成果: Paper › 査読

@conference{0e89342274794bb8b61419445fd6d6bc,

title = "Statistical properties of a coherent structure function for homogeneous isotropic turbulence and turbulent channel flows",

abstract = "Statistical properties of a coherent structure function FCS are investigated using DNS data for homogeneous isotropic turbulence and turbulent channel flows. The function FCS is defined as the second invariant Q of a velocity gradient tensor normalized by the magnitude E of the velocity gradient tensor. In homogeneous isotropic turbulence, the probability density function (pdf) of FCS shows good agreement at different Reynolds number. The volume fraction of positive Q and the average of FCS converge to a certain value at high Reynolds number. For the turbulent channel flows, the pdf of FCS at different Reynolds number coincides very well at the distance from the wall in wall units. The profiles of the conditional average of positive and negative Q, the volume fraction, and the near-wall FCS 2 are in good agreement at different Reynolds number and those profiles are given as a function of the distance from the wall in wall units.",

author = "Hiromichi Kobayashi and Yasuhiro Tominaga and Taisuke Kubota and Mamoru Tanahashi and Toshio Miyauchi",

year = "2009",

month = jan,

day = "1",

language = "English",

pages = "335--340",

note = "6th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2009 ; Conference date: 22-06-2009 Through 24-06-2009",

}

TY - CONF

T1 - Statistical properties of a coherent structure function for homogeneous isotropic turbulence and turbulent channel flows

AU - Kobayashi, Hiromichi

AU - Tominaga, Yasuhiro

AU - Kubota, Taisuke

AU - Tanahashi, Mamoru

AU - Miyauchi, Toshio

PY - 2009/1/1

Y1 - 2009/1/1

N2 - Statistical properties of a coherent structure function FCS are investigated using DNS data for homogeneous isotropic turbulence and turbulent channel flows. The function FCS is defined as the second invariant Q of a velocity gradient tensor normalized by the magnitude E of the velocity gradient tensor. In homogeneous isotropic turbulence, the probability density function (pdf) of FCS shows good agreement at different Reynolds number. The volume fraction of positive Q and the average of FCS converge to a certain value at high Reynolds number. For the turbulent channel flows, the pdf of FCS at different Reynolds number coincides very well at the distance from the wall in wall units. The profiles of the conditional average of positive and negative Q, the volume fraction, and the near-wall FCS 2 are in good agreement at different Reynolds number and those profiles are given as a function of the distance from the wall in wall units.

AB - Statistical properties of a coherent structure function FCS are investigated using DNS data for homogeneous isotropic turbulence and turbulent channel flows. The function FCS is defined as the second invariant Q of a velocity gradient tensor normalized by the magnitude E of the velocity gradient tensor. In homogeneous isotropic turbulence, the probability density function (pdf) of FCS shows good agreement at different Reynolds number. The volume fraction of positive Q and the average of FCS converge to a certain value at high Reynolds number. For the turbulent channel flows, the pdf of FCS at different Reynolds number coincides very well at the distance from the wall in wall units. The profiles of the conditional average of positive and negative Q, the volume fraction, and the near-wall FCS 2 are in good agreement at different Reynolds number and those profiles are given as a function of the distance from the wall in wall units.

UR - http://www.scopus.com/inward/record.url?scp=85048391381&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85048391381&partnerID=8YFLogxK

M3 - Paper

AN - SCOPUS:85048391381

SP - 335

EP - 340

T2 - 6th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2009

Y2 - 22 June 2009 through 24 June 2009

ER -