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Çѱ¹¼öÀÚ¿øÇÐȸ / v.33, no.4, 2000³â, pp.461-469
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°³¼ö·Î¿¡¼ ¼ÒÀ¯»çÀÇ ¿µÇâÀ» °í·ÁÇÑ ºÎÀ¯ÀÔÀÚ À¯µ¿¿¡ °üÇÑ ¼öÄ¡Àû ¿¬±¸
( A Numerical Analysis of Sediment-laden Flow in Open Channel with Bed-load Effect ) |
| À±ÁØ¿ë;°½Â±Ô;°½Ãȯ; ÇѾç´ëÇб³ °øÇдëÇÐ ±â°è»ê¾÷°øÇкÎ;ÇѾç´ëÇб³ ´ëÇпø ±â°è°øÇаú;Çѱ¹Çؾ翬±¸¼Ò ¿¬¾È¡¤Ç׸¸°øÇבּ¸¼¾ÅÍ;
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| º» ¿¬±¸¿¡¼´Â ºÎÀ¯ÀÔÀÚ¸¦ Æ÷ÇÔÇÏ´Â À¯µ¿À» ÀÔÀÚÅ©±â¿Í ÀÔÀÚ·®À» ´Þ¸®ÇÑ ¸î °¡Áö °æ¿ì¿¡ ´ëÇÏ¿© ¼öÄ¡ÀûÀ¸·Î ÇØ¼®Çϰí Coleman(1981, 1986)ÀÇ ½ÇÇè°á°ú¿Í ºñ±³ÇÏ¿´´Ù. ¿ÏÀü ³·ù À¯µ¿ÀåÀ» ÇØ¼®Çϱâ À§ÇÏ¿© k-$omega$³·ù¸ðÇüÀ» »ç¿ëÇÏ¿´À¸¸ç, ³óµµÀå ÇØ¼®À» À§Çؼ´Â ħ°¼Óµµ¸¦ °í·ÁÇÑ ÀϹÝÈµÈ ³óµµ¹æÁ¤½ÄÀ» Àû¿ëÇÏ¿´´Ù. À¯µ¿°ú ÀÔÀÚÀÇ »óÈ£ÀÛ¿ëÀº Einstein°ú Chien(1955)ÀÇ ¸ðÇüÀ» µµÀÔÇÏ¿© ¼öÄ¡°è»êÇÏ¿´´Ù. ±âÁ¸ÀÇ ´ëºÎºÐ ¿¬±¸¿¡¼´Â ¼ÒÀ¯»çÀÇ µÎ²²¸¦ °í·ÁÇÏÁö ¾ÊÀº ¿¬±¸¸¦ ¼öÇàÇÏ¿´À¸³ª, ÀÔÀÚ·®ÀÌ ¸¹¾ÆÁö°Å³ª ÀÔÀÚÅ©±â°¡ Ŭ °æ¿ì À̸¦ ¹«½ÃÇÒ ¼ö ¾ø´Â °ÍÀ¸·Î ¹àÇôÁ³´Ù. ¼ÒÀ¯»çÀÇ µÎ²²¿Í ÇÏ»ó¿¡ ÀÇÇÑ Ç¥¸é °ÅÄ¥±â È¿°ú¸¦ °í·ÁÇÏ¿© º» ¿¬±¸¸¦ ¼öÇàÇÏ¿´´Âµ¥, ¿©±â¼ ³óµµºÐÆ÷¸¦ °áÁ¤Áþ°Ô µÇ´Â $eta$°ªÀÌ ÀÔÀÚÀÇ Å©±â¿Í ÀÔÀÚ·®¿¡ °ü·ÃµÇ¾î ÀÖ´Ù´Â »ç½ÇÀ» È®ÀÎÇÒ ¼ö ÀÖ¾ú´Ù. ±âÁ¸ ¿¬±¸°á°ú´Â $eta$°¡ 1.0º¸´Ù Å« °ªÀ» °¡Áø´Ù°í º¸°íµÇ¾úÀ¸³ª, º» ¿¬±¸¸¦ ÅëÇØ 1.0º¸´Ù ÀÛ¾ÆÁú¼ö ÀÖÀ½ÀÌ È®ÀεǾú°í, ÀÌ´Â ÃÖ±Ù¿¡ º¸°íµÈ ¿¬±¸ °á°ú¿Í ÀÏÄ¡µÇ´Â °á°úÀÌ´Ù. |
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| An numerical analysis of sediment-laden flow is carried out, and results are compared with the experiments of Coleman(1981, 1986) that included the several cases varying sediment size and quantity in open channel flow. K-$omega$ turbulence model is selected for the fully turbulent flow field, and the concentration equation considering the fall velocity is adopted for the concentration field. The model of Einstein and Chien(1955) is applied to couple the velocity field and the concentration field. Most of researches have been carried out without considering the bed-load thickness, but it is found that the bed-load thickness cannot be ignored in case of a large amount of sediment or a large size of it. The bed-load thickness and surface roughness are considered in this study. Here, $eta$ value, which is defined by the reciprocal of turbulent Schmidt number and is related with the concentration profile, is found to be varied according to the sediment size and quantity. Even though most of researchers have insisted that $eta$ had always larger than 1.0, it may be concluded that $eta$ can have smaller value than 1.0, that is coincident with the report of recent research. |
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| Ű¿öµå |
| ºÎÀ¯ÀÔÀÚ;°³¼ö·Î À¯µ¿;³óµµ¹æÁ¤½Ä;k-$omega$³·ù¸ðÇü;¼ÒÀ¯»çÀÇ ¿µÇâ;suspended sediment;open channel flow;concentration equation equation;k-$omega$ turbulence model;bed-load effect; |
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Çѱ¹¼öÀÚ¿øÇÐȸ³í¹®Áý / v.33, no.4, 2000³â, pp.461-469
Çѱ¹¼öÀÚ¿øÇÐȸ
ISSN : 1226-6280
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200011920063821)
¾ð¾î : Çѱ¹¾î |
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| ³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø |
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