ストリークã®å˜åœ¨ã™ã‚‹å¢ƒç•Œå±¤ã«ãŠã„ã¦ä¹±æµé·ç§»ã®ãã£ã‹ã‘ã¨ãªã‚‹æµã‚Œã®æ§‹é€
Numerical simulations are carried out aimed at finding a key flow structure which leads to a laminar-turbulent transition of a boundary layer with streaky structures. In the preliminary computation, an array of cuboids is used to form streaky structures inside a boundary layer. Then, a disturbance is introduced into the boundary layer by ejecting a short-duration jet from a hole in the wall into a
Turbulent Separation Criteria
Turbulent separation criteria are the most useful since most pressure recovery is done using turbulent boundary layers. There are many criteria that are used. Minimum C p The simplest criterion is that used to estimate when the flow will separate from the leading edge of an airfoil. This rule of thumb states that there is a minimum value of C p that can be tolerated. Numbers such as -10 to -13 are
一様ç‰æ–¹ä¹±æµã«ãŠã‘る低圧力旋回渦
一様ç‰æ–¹ä¹±æµã«ãŠã‘ã‚‹ 低圧力旋回渦ã®åŒå®šã¨å¯è¦–化 ä¸‰æµ¦è‹±æ˜ (æ ¸èžåˆç ”) ・ 木田é‡é›„ (æ ¸èžåˆç ”) 渦ã®æ—‹å›žä¸å¿ƒè»¸ï¼ˆæ¸¦è»¸ï¼‰ã¨æ—‹å›žé ˜åŸŸï¼ˆæ¸¦èŠ¯ï¼‰ã‚’定義〠抽出ã™ã‚‹ãŸã‚ã«æœ€è¿‘開発ã—ãŸåœ§åŠ›æ–é¢æ¥µå°æ—‹å›žæ³•ã‚’一様ç‰æ–¹ä¹±æµã«é©ç”¨ã—〠渦ã®æ§‹é€ ã¨ãã®æ™‚間発展を追跡ã™ã‚‹ã¨ã¨ã‚‚ã«ã€ 従æ¥ã‹ã‚‰ã®ä»£è¡¨çš„ãªæ¸¦åŒå®šæ³•ã¨ã®è©³ç´°ãªæ¯”較を行ã†ã€‚ 本方法ã§æŠ½å‡ºã•ã‚Œã‚‹ä½Žåœ§åŠ›æ—‹å›žæ¸¦ã¯ç´°é•·ã„管状ã®å½¢ã‚’ã¨ã‚Šã€ãã®æ–é¢ã®å¾„㯠コルモゴãƒãƒ•é•·ã®ï¼˜å€ç¨‹åº¦ã®ã¾ã‚ã‚Šã«åºƒã分布ã—ã¦ã„る。
Funaken: CFD
CFDã¯Computational Fluid Dynamicsã®ç•¥ã§ï¼Œæ—¥æœ¬èªžã§ã¯æ•°å€¤æµä½“力å¦ã¨ã„ã„ã¾ã™ï¼Žè¨ˆç®—æ©Ÿã®æ€§èƒ½å‘上ã¨å…±ã«1980年代以é™æµä½“力å¦ã®ä¸€åˆ†é‡Žã¨ã—ã¦æ€¥é€Ÿã«ç™ºé”ã—ã¾ã—ãŸï¼Žæœ¬ç ”究室ã§ã‚‚CFDã‚’è¡Œã£ã¦ã„ã¾ã™ï¼Žä¹±æµã®è¨ˆç®—方法ã«ã¯ã„ã‚ã„ã‚ãªã‚¢ãƒ—ãƒãƒ¼ãƒãŒã‚ã‚Šã¾ã™ãŒï¼Œæœ¬ç ”究室ã§ã¯RANS，LES，LBMを用ã„ãŸCFDã‚’è¡Œã£ã¦ã„ã¾ã™ï¼Ž RANS（Reynolds Averaged Navier-Stokes） †最近，乱æµã®è¨ˆç®—手法ã¯ï¼Œè¨ˆç®—機性能ã®ç›®è¦šã—ã„発é”ã‹ã‚‰ï¼ŒLESã‚„DNSã¨ã„ã£ãŸã‚ˆã‚ŠåŽ³å¯†ãªæ–¹æ³•ã«ç§»ã‚Šå¤‰ã‚ã‚Šã¤ã¤ã‚ã‚Šã¾ã™ã€‚ã—ã‹ã—ãªãŒã‚‰ï¼Œå®Ÿç”¨çš„ãªè¨ˆç®—（æµä½“機械ã®è¨è¨ˆãªã©ï¼‰ã«å¯¾ã—ã¦ã¯ãã®ã‚ˆã†ãªè¨ˆç®—手法ã§ã¯ã¾ã ã¾ã è¨ˆç®—è² è·ãŒå¤§ãã„ãŸã‚，çµæžœãŒå‡ºã‚‹ã¾ã§ã«éžå¸¸ã«é•·ã„時間ãŒã‹ã‹ã£ã¦ã—ã¾ã„ã¾ã™ã€‚ãã“ã§ï¼Œä¹±æµã®åŠ¹æžœã‚’ä¹±æµãƒ¢ãƒ‡ãƒ«ã«ã‚ˆã£ã¦ãƒ¢ãƒ‡ãƒ«åŒ–ã—ãŸRANS解æžãŒã‚ˆã利用ã•ã‚Œã¾ã™ã€‚以下ã«RANSã§ä½¿ç”¨
1
リリースã€éšœå®³æƒ…å ±ãªã©ã®ã‚µãƒ¼ãƒ“スã®ãŠçŸ¥ã‚‰ã›
最新ã®äººæ°—エントリーã®é…ä¿¡
j次ã®ãƒ–ックマーク
kå‰ã®ãƒ–ックマーク
lã‚ã¨ã§èªã‚€
eコメント一覧を開ã
oページを開ã
Turbulence Modeling Resource
http://aero.me.tut.ac.jp/Lectures/Turbulence/turb00.pdf
Ansys Fluent | Fluid Simulation Software
Turbulence Modeling Resource
Generation of Turbulent Inflow Data for Spatially-Developing Boundary Layer Simulations
https://pubs.aip.org/aip/pof/article/29/11/111106/105032/Split-energy-cascade-in-turbulent-thin-fluid
What does turbulence have in common with an epidemic?
Hof Group
https://pubs.aip.org/aip/pof
http://www.rs.noda.tus.ac.jp/~ss2008/ss2008_lecture_suga.pdf
{{#tags}}- {{label}}
{{/tags}}