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Turbulent viscosity variability in self-propelled body wake model

Turbulent viscosity variability in self-propelled body wake model

: ๋ณธ ์—ฐ๊ตฌ์—์„œ๋Š” ์ž๊ฐ€ ์ถ”์ง„์ฒด์˜ ๋‚œ๋ฅ˜ ํ›„๋ฅ˜์—์„œ ์ผ์ •ํ•œ ๋‚œ๋ฅ˜ ์ ๋„ ๊ฐ€์ •์„ ํ๊ธฐํ•˜๊ณ , ์ขŒํ‘œ์— ๋”ฐ๋ฅธ ๋ณ€๋™์„ ๊ณ ๋ คํ•˜๋Š” ์ƒˆ๋กœ์šด ์ ‘๊ทผ ๋ฐฉ์‹์„ ์ œ์‹œํ•œ๋‹ค. ์ด๋Š” ์‹ค์ œ ํ๋ฆ„ ํ˜„์ƒ๊ณผ ๋” ์ž˜ ๋ถ€ํ•ฉํ•˜๋ฉฐ, ๊ธฐ์กด ๋ชจ๋ธ์˜ ํ•œ๊ณ„๋ฅผ ๊ทน๋ณตํ•˜๋ ค๋Š” ์‹œ๋„์ด๋‹ค. 1. ๋‚œ๋ฅ˜ ํ›„๋ฅ˜์˜ ์ค‘์š”์„ฑ ๋‚œ๋ฅ˜ ํ›„๋ฅ˜์˜ ์—ฐ๊ตฌ๋Š” ๊ณผํ•™์  ์ดํ•ด๋ฟ๋งŒ ์•„๋‹ˆ๋ผ ์‹ค์šฉ์ ์ธ ์ธก๋ฉด์—์„œ๋„ ๋งค์šฐ ์ค‘์š”ํ•˜๋‹ค. ์˜ˆ๋ฅผ ๋“ค์–ด, ๊ณตํ•ญ ์šด์˜์—์„œ๋Š” ๋‚œ๋ฅ˜ ํ›„๋ฅ˜๊ฐ€ ๋น„ํ–‰๊ธฐ์˜ ์ด์ฐฉ๋ฅ™์— ์˜ํ–ฅ์„ ๋ฏธ์น˜๋ฉฐ, ํ•ด์–‘ ํ‘œ์ธต์—์„œ์˜ ํ˜ผํ•ฉ ๊ณผ์ •์€ ์„ ๋ฐ•์˜ ์šดํ•ญ๊ณผ ์ง์ ‘์ ์œผ๋กœ ์—ฐ๊ด€๋˜์–ด ์žˆ๋‹ค. ํŠนํžˆ, ์„ ๋ฐ•์˜ ๋‚œ๋ฅ˜ ํ›„๋ฅ˜๋Š” ๋ ˆ์ด๋” ๊ด€์ธก ํ•ด์„์—์„œ ์ค‘์š”ํ•œ ์—ญํ• ์„ ํ•˜

Physics Model
Marching of Freely Falling Plates

Marching of Freely Falling Plates

'์ž์œ  ๋‚™ํ•˜ํ•˜๋Š” ํŒ์˜ ํ–‰์ง„: ์ˆ˜์น˜ ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ๋ถ„์„'์€ ์œ ์ฒด ์—ญํ•™๊ณผ ๋น„์„ ํ˜• ๋™์—ญํ•™ ๋ถ„์•ผ์—์„œ ์ค‘์š”ํ•œ ๋ฌธ์ œ์ธ ์ž์œ  ๋‚™ํ•˜ํ•˜๋Š” ํŒ์˜ ์šด๋™์— ๋Œ€ํ•œ ์‹ฌ์ธต์ ์ธ ์—ฐ๊ตฌ๋ฅผ ์ œ๊ณตํ•ฉ๋‹ˆ๋‹ค. ์ด ์—ฐ๊ตฌ๋Š” ๋‹ค์–‘ํ•œ ๋ฌผ๋ฆฌ์  ์กฐ๊ฑด ํ•˜์—์„œ ํŒ์ด ์–ด๋–ป๊ฒŒ ํ–‰๋™ํ•˜๋Š”์ง€, ๊ทธ๋ฆฌ๊ณ  ์ด๋Ÿฌํ•œ ํ–‰๋™์ด ์ฃผ๋ณ€ ์œ ์ฒด์™€ ์–ด๋–ค ์ƒํ˜ธ์ž‘์šฉ์„ ํ•˜๋Š”์ง€๋ฅผ ํƒ๊ตฌํ•˜๊ณ  ์žˆ์Šต๋‹ˆ๋‹ค. 1. ํŒ์˜ ๊ถค์ ๊ณผ ์šด๋™ ์ž์œ  ๋‚™ํ•˜ํ•˜๋Š” ํŒ์˜ ๊ถค์ ์€ ๋งค์šฐ ๋ณต์žกํ•˜๋ฉฐ, ์ด๋Š” ๋ ˆ์ด๋†€์ฆˆ ์ˆ˜์น˜(Reynolds number)์™€ ํ”„๋ผ์šฐ๋“œ ์ˆ˜(Froude number)์— ํฌ๊ฒŒ ์˜์กดํ•ฉ๋‹ˆ๋‹ค. ๋†’์€ ๋ ˆ์ด๋†€์ฆˆ ์ˆ˜์—์„œ ์†Œํ˜• ํ”„๋ผ์šฐ๋“œ ์ˆ˜๋ฅผ ๊ฐ€์ง„ ํŒ์€ ์ง„

Physics
Unsteady Hydromagnetic Flow of Viscoelastic Fluid down an Open Inclined Channel

Unsteady Hydromagnetic Flow of Viscoelastic Fluid down an Open Inclined Channel

: ๋ณธ ๋…ผ๋ฌธ์€ ๊ฐœ๋ฐฉํ˜• ๊ฒฝ์‚ฌ ์ฑ„๋„ ๋‚ด์—์„œ ์›”ํ„ฐ ์œ ์ฒด์˜ ๋น„์ •์ƒ ์ˆ˜๋ ฅํ•™์  ํ๋ฆ„์„ ์—ฐ๊ตฌํ•˜๋ฉฐ, ํŠนํžˆ ๊ท ์ผํ•œ ์ˆ˜์ง ์ž๊ธฐ์žฅ์ด ์ด ํ๋ฆ„์— ๋ฏธ์น˜๋Š” ์˜ํ–ฅ์„ ๋ถ„์„ํ•œ๋‹ค. ์›”ํ„ฐ ์œ ์ฒด๋Š” ๋น„๋‰ดํ„ด ์œ ์ฒด ์ค‘ ํ•˜๋‚˜๋กœ, ๊ณ ์ „์ ์ธ ์‘๋ ฅ ๋ณ€ํ˜•๋ฅ  ๊ด€๊ณ„๋ฅผ ๋”ฐ๋ฅด์ง€ ์•Š๋Š” ํŠน์„ฑ์„ ๊ฐ€์ง„๋‹ค. ์ด๋Ÿฌํ•œ ๋ฌผ์งˆ์€ ํ”Œ๋ผ์Šคํ‹ฑ ์„ฑํ˜•, ์„ฌ์œ  ์ œ์กฐ ๋“ฑ ๋‹ค์–‘ํ•œ ์‚ฐ์—…์—์„œ ์ค‘์š”ํ•œ ์—ญํ• ์„ ํ•˜๋Š”๋ฐ, ์ด ์—ฐ๊ตฌ๋Š” ์›”ํ„ฐ ์œ ์ฒด์˜ ํ๋ฆ„์— ๋Œ€ํ•œ ์ดํ•ด๋ฅผ ๊นŠ๊ฒŒ ํ•˜๊ธฐ ์œ„ํ•ด ์ˆ˜ํ–‰๋˜์—ˆ๋‹ค. ๋…ผ๋ฌธ์—์„œ๋Š” ๋ผํ”Œ๋ผ์Šค ๋ณ€ํ™˜๊ณผ ์œ ํ•œ ํ‘ธ๋ฆฌ์— ์‚ฌ์ธ ๋ณ€ํ™˜ ๊ธฐ๋ฒ•์„ ์‚ฌ์šฉํ•˜์—ฌ ์†๋„ ๋ถ„ํฌ๋ฅผ ํ‰๊ฐ€ํ•œ๋‹ค. ์ด๋Ÿฌํ•œ ์ˆ˜ํ•™์  ๋ฐฉ๋ฒ•์€ ๋ณต์žกํ•œ ๋ฏธ๋ถ„ ๋ฐฉ์ •์‹์„ ํ•ด๊ฒฐํ•˜

Physics Computational Engineering Computer Science
Computational Fluid Dynamics In GARUDA Grid Environment

Computational Fluid Dynamics In GARUDA Grid Environment

๋ณธ ๋…ผ๋ฌธ์€ ๊ณ„์‚ฐ ์œ ์ฒด์—ญํ•™(CFD) ์• ํ”Œ๋ฆฌ์ผ€์ด์…˜์˜ ํšจ์œจ์ ์ธ ๊ตฌํ˜„๊ณผ ๊ทธ๋ฆฌ๋“œ ์ปดํ“จํŒ… ํ™˜๊ฒฝ์˜ ์ค‘์š”์„ฑ์„ ๊ฐ•์กฐํ•˜๊ณ  ์žˆ์Šต๋‹ˆ๋‹ค. ํŠนํžˆ, ๊ตญ๊ฐ€ ์ง€์‹ ๋„คํŠธ์›Œํฌ(NKN) ๊ธฐ๋ฐ˜์˜ GARUDA ๊ทธ๋ฆฌ๋“œ ํ™˜๊ฒฝ์„ ํ™œ์šฉํ•˜์—ฌ CFD ๋ชจ๋ธ์„ ๊ตฌํ˜„ํ•จ์œผ๋กœ์จ, ๊ณ ์„ฑ๋Šฅ ์ปดํ“จํŒ…(HPC) ์ž์› ๋ถ€์กฑ๊ณผ ๋ณต์žกํ•œ ๋„๊ตฌ ๊ฒฐํ•ฉ ๋ฌธ์ œ๋ฅผ ํ•ด๊ฒฐํ•˜๋ ค๋Š” ์‹œ๋„๊ฐ€ ๋‹๋ณด์ž…๋‹ˆ๋‹ค. 1. CFD์™€ HPC์˜ ๊ด€๊ณ„ CFD๋Š” ๋ณต์žกํ•œ ์œ ์ฒด ์—ญํ•™ ๋ฌธ์ œ๋ฅผ ์ˆ˜์น˜์ ์œผ๋กœ ๋ชจ๋ธ๋งํ•˜๊ณ  ๋ถ„์„ํ•˜๋Š” ๋ฐ ์‚ฌ์šฉ๋˜๋Š” ๊ธฐ์ˆ ๋กœ, ์ด๋ฅผ ์ˆ˜ํ–‰ํ•˜๊ธฐ ์œ„ํ•ด์„œ๋Š” ๋Œ€๊ทœ๋ชจ ๊ณ„์‚ฐ ์ž์›์ด ํ•„์š”ํ•ฉ๋‹ˆ๋‹ค. ์ด์— ๋”ฐ๋ผ CFD๋Š” HPC ๋ฐœ์ „์˜ ํ•ต์‹ฌ ๋™๋ ฅ ์ค‘ ํ•˜๋‚˜์ž…

Physics
Floating Extensional Flows

Floating Extensional Flows

๋ณธ ๋…ผ๋ฌธ์€ ๋น™ํ•˜ ์‹œํŠธ์˜ ํ™•์žฅ ํ๋ฆ„์— ๋Œ€ํ•œ ์‹ฌ๋„ ์žˆ๋Š” ๋ชจ๋ธ๋ง๊ณผ ๋ถ„์„์„ ํ†ตํ•ด, ๋‰ดํ„ด ์œ ์ฒด์™€ ๋น„๋‰ดํ„ด ์œ ์ฒด ์‚ฌ์ด์˜ ์ค‘์š”ํ•œ ์—ญํ•™์  ์ฐจ์ด๋ฅผ ํƒ๊ตฌํ•œ๋‹ค. ์ด ์—ฐ๊ตฌ๋Š” ํŠนํžˆ ๋น™ํ•˜๊ฐ€ ๋ฐ”๋‹ค ์œ„๋กœ ๋– ์˜ค๋ฅด๋ฉด์„œ ๋ฐœ์ƒํ•˜๋Š” ํ™•์žฅ ํ๋ฆ„์— ์ดˆ์ ์„ ๋งž์ถ”๊ณ  ์žˆ๋‹ค. 1. ๋น™ํ•˜ ์‹œํŠธ์˜ ๊ธฐ๋ณธ ํŠน์„ฑ ์ „๋‹จ ํ๋ฆ„ : ๋น™ํ•˜์˜ ์ค‘์‹ฌ๋ถ€๋Š” ์ง€๋ฐ˜์— ๊ณ ์ •๋˜์–ด ์žˆ์œผ๋ฉฐ, ์ฃผ๋œ ํ๋ฆ„์€ ์ „๋‹จ ํ๋ฆ„์ด๋‹ค. ํ™•์žฅ ํ๋ฆ„ : ์ค‘๋ ฅ์— ์˜ํ•ด ๋ณ€ํ˜•๋˜๋Š” ๋น™ํ•˜๋Š” ๋‘๊ป˜๊ฐ€ ์ถฉ๋ถ„ํžˆ ์–‡์•„์ง€๋ฉด ๋ฐ”๋‹ค ์œ„๋ฅผ ๋– ๋‹ค๋‹ ์ˆ˜ ์žˆ๋‹ค. ์ด๋•Œ์˜ ํ๋ฆ„์„ ํ™•์žฅ ํ๋ฆ„์ด๋ผ ๋ถ€๋ฅธ๋‹ค. 2. ๋‰ดํ„ด ์œ ์ฒด์™€ ๋น„๋‰ดํ„ด ์œ ์ฒด์˜ ๋น„๊ต ๋‰ดํ„ด ์œ ์ฒด : ์ ์„ฑ์ด ์ผ์ •ํ•œ

Physics
Cicada: a Heavy but Agile Flyer

Cicada: a Heavy but Agile Flyer

์ด ๋…ผ๋ฌธ์€ ๋งค๋ฏธ์˜ ๋น„ํ–‰ ๋ฉ”์ปค๋‹ˆ์ฆ˜์— ๋Œ€ํ•œ ๊นŠ์ด ์žˆ๋Š” ๋ถ„์„์„ ์ œ๊ณตํ•˜๋ฉฐ, ํŠนํžˆ ๊ทธ๋“ค์˜ ๋ฌด๊ฑฐ์šด ์ฒด์ค‘์—๋„ ๋ถˆ๊ตฌํ•˜๊ณ  ๋†’์€ ์–‘๋ ฅ์„ ๋ฐœ์ƒ์‹œํ‚ค๋Š” ๋Šฅ๋ ฅ์— ์ดˆ์ ์„ ๋งž์ถ”๊ณ  ์žˆ์Šต๋‹ˆ๋‹ค. ์ด ์—ฐ๊ตฌ๋Š” ๊ณค์ถฉ ๋น„ํ–‰์˜ ๋ณต์žก์„ฑ์„ ์ดํ•ดํ•˜๋Š” ๋ฐ ์ค‘์š”ํ•œ ๋‹จ๊ณ„๋ฅผ ์ œ๊ณตํ•˜๊ณ  ์žˆ์œผ๋ฉฐ, ์ด๋Ÿฌํ•œ ์ง€์‹์€ ๋งˆ์ดํฌ๋กœ ์—์–ด ๋น„ํžˆํด(MAV) ์„ค๊ณ„์—์„œ ์ค‘์š”ํ•œ ์—ญํ• ์„ ํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค. 1. ๋งค๋ฏธ์˜ ํŠน์„ฑ ๋ถ„์„ ๋งค๋ฏธ๋Š” ๋‹ค๋ฅธ ๊ณค์ถฉ๋“ค์— ๋น„ํ•ด ์ƒ๋Œ€์ ์œผ๋กœ ๋ฌด๊ฑฐ์šด ์ฒด์ค‘์„ ๊ฐ€์ง€๊ณ  ์žˆ์ง€๋งŒ, ๋†’์€ ์–‘๋ ฅ์„ ๋ฐœ์ƒ์‹œ์ผœ ๋‚  ์ˆ˜ ์žˆ๋Š” ๋Šฅ๋ ฅ์ด ์žˆ์Šต๋‹ˆ๋‹ค. ์ด ์—ฐ๊ตฌ์—์„œ๋Š” ์ด๋Ÿฌํ•œ ๋ฉ”์ปค๋‹ˆ์ฆ˜์„ ์ดํ•ดํ•˜๊ธฐ ์œ„ํ•ด ๊ณ ์† ํฌ๊ทธ๋ผ๋ฉ”ํŠธ๋ฆฌ ์‹œ์Šคํ…œ

Physics

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