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Çѱ¹¼öÀÚ¿øÇÐȸ / v.44, no.3, 2011³â, pp.189-198
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³ôÀº ·¹À̳îÁî¼ö¸¦ °¡Áø ³·ù Áøµ¿ °æ°èÃþ¿¡¼ÀÇ k-¥å°ú k-¥ø ³·ù¸ðÇüÀÇ ºñ±³
( Comparative Study on k-¥å and k-¥ø Closures under the Condition of Turbulent Oscillatory Boundary Layer Flow at High Reynolds Number ) |
¼Õ¹Î¿ì;À̰üÈ«;À̱漺;À̵ÎÇÑ; ÀÎÇÏ´ëÇб³ ÇØ¾ç°úÇбâ¼ú¿¬±¸¼Ò;ÀÎÇÏ´ëÇб³ ÀÚ¿¬°úÇдëÇÐ ÇØ¾ç°úÇаú;¼¿ï´ëÇб³ °ø°ú´ëÇÐ °Ç¼³È¯°æ°øÇкÎ;Çѱ¹°Ç¼³±â¼ú¿¬±¸¿ø ÇÏÃµÇØ¾ÈÇ׸¸¿¬±¸½Ç;
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ÃÊ ·Ï |
º» ¿¬±¸´Â ³·ùÇö»óÀÇ ¸ðÇüȸ¦ À§ÇØ ³Î¸® ÀÌ¿ëµÇ´Â k-$varepsilon$°ú k-$omega$ ³·ù¸ðÇüÀ» ºñ±³ÇÏ´Â °ÍÀÌ ¸ñÀûÀ¸·Î, Ⱦ¹æÇâ È帧ÀÌ ¹«½ÃµÉ ¼ö ÀÖ´Â U-Æ©ºê ¸ð¾çÀÇ ÅͳÎÇü ¼ö·Î ³» ³ôÀº ·¹À̳îÁî¼ö¸¦ °¡Áø Áøµ¿ °æ°èÃþ È帧¿¡ µÎ ³·ùÇØ¼®¹æ¹ýÀ» Àû¿ëÇÏ¿´´Ù. ³·ù¸ðÇüÀÇ Àû¿ëÀº 1Â÷¿ø ¿¬Á÷ ¸ðÇüÀ» ÅëÇØ ÀÌ·ç¾îÁö¸ç, ¼öÄ¡ ¸ðÀÇ °á°ú, À¯¼ÓÀÇ ºÐÆ÷¿Í ³·ù¿îµ¿¿¡³ÊÁö (turbulent kinetic energy) ¸ðµÎ¿¡¼ µÎ ¸ðÇüÀÌ ¸Å¿ì À¯»çÇÑ °á°ú¸¦ ³ªÅ¸³½´Ù. À̸¦ ÅëÇÏ¿©, Ⱦ¹æÇ⠾з°æ»ç°¡ ¹«½ÃµÉ ¼ö ÀÖ´Â Á¶°Ç¿¡¼´Â k-$varepsilon$°ú k-$omega$ ³·ù¸ðÇüÀÌ Å« Â÷À̸¦ º¸ÀÌÁö ¾Ê°í, ¿ì¼öÇÑ °á°ú¸¦ ³ªÅ¸³¿À» ¾Ë ¼ö ÀÖ´Ù. µû¶ó¼ Á÷¼±Çü ÇÏõ ¹× Çϱ¸ºÎ, ÇØ¾È¿¡¼ÀÇ ÆÄ¶û È帧 µî°ú °°ÀÌ È¾¹æÇâÀÇ ¾Ð·Â°æ»ç°¡ ¹Ì¹ÌÇÑ Áö¿ª¿¡¼ÀÇ ³·ù¸¦ ¼öÄ¡ÀûÀ¸·Î ÇØ¼®ÇÒ °æ¿ì, ±âÁ¸ÀÇ Ç³ºÎÇÑ ¿¬±¸¸¦ ÅëÇØ ¸Å°³º¯¼öÀÇ °Ëº¸ÁõÀÌ Àå±â°£ ÀÌ·ç¾îÁø k-$varepsilon$ ¸ðÇüÀ» ÀÌ¿ëÇÏ´Â °ÍÀÌ ÃßõµÈ´Ù. |
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The aim of this study is to compare k-$varepsilon$ and k-$omega$ closures under the condition of oscillatory layer flow at high Reynolds number. A one dimensional vertical model incorporated with flow momentum equations and turbulence models (k-$varepsilon$ and k-$omega$) is applied to the laboratory measurements in the turbulent oscillatory boundary layer. The numerical simulation reveals that both turbulence models calculate similar velocity profiles and turbulent kinetic energy (TKE). In addition, both deliver high accuracy under the condition of negligible spanwise pressure gradient. Therefore, it is recommended in this study to use k-$varepsilon$ closure, of which numerical coefficients have been calibrated from many studies, for the cases of straight channel, estuary, and coastal environment where the spanwise pressure gradient is not significant. |
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Ű¿öµå |
Áøµ¿ °æ°èÃþ;³·ù¿îµ¿¿¡³ÊÁö;¾Ð·Â°æ»ç;oscillatory boundary layer;k-$varepsilon$;k-$omega$;turbulent kinetic energy;pressure gradient; |
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Çѱ¹¼öÀÚ¿øÇÐȸ³í¹®Áý / v.44, no.3, 2011³â, pp.189-198
Çѱ¹¼öÀÚ¿øÇÐȸ
ISSN : 1226-6280
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO201115952331146)
¾ð¾î : Çѱ¹¾î |
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³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø |
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