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Çѱ¹¼öÀÚ¿øÇÐȸ / v.44, no.2, 2011³â, pp.145-156
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Quasi-steady Wave Propagation ¾Ë°í¸®µëÀ» ÀÌ¿ëÇÑ 2Â÷¿ø ¼öÄ¡¸ðÇüÀÇ ÇÏ»ó°æ»çÇ× Ã³¸®
( Treatment of the Bed Slope Source Term for 2-Dimensional Numerical Model Using Quasi-steady Wave Propagation Algorithm ) |
±èÅÂÇü;ÇѰǿ¬;±èº´Çö; °æºÏ´ëÇб³ °ø°ú´ëÇÐ °ÇÃà.Åä¸ñ°øÇкÎ;°æºÏ´ëÇб³ °ø°ú´ëÇÐ °ÇÃà.Åä¸ñ°øÇкÎ;͏®Æ÷´Ï¾Æ ÁÖ¸³´ëÇб³ ¾ó¹ÙÀÎ, Åä¸ñ.ȯ°æ°øÇаú;
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º» ¿¬±¸¿¡¼´Â ÀÚ¿¬ÇÏõÀÇ È帧¿¡¼ ÈçÈ÷ ¹ß»ýÇϴ õÀÌ·ù, ºÒ¿¬¼Ó·ù, ¸¶¸¥Çϵµ·ÎÀÇ ÆÄÀÇ ÀüÆÄ µîÀ» Æ÷ÇÔÇÏ´Â º¹ÀâÇÑ È帧À» ÇØ¼®Çϱâ À§ÇÑ °íÁ¤È®µµ 2Â÷¿ø ¼öÄ¡¸ðÇüÀ» °³¹ßÇÏ¿´´Ù. ÇÏ»ó°æ»çÇ×À» È¿À²ÀûÀ¸·Î ó¸®Çϱâ À§ÇØ quasi-steady wave propagation ±â¹ýÀ» Àû¿ëÇÏ¿© ÇØ´ç °ÝÀÚ¿¡ ´ëÇÑ »ý¼ºÇ×ÀÇ ¿µÇâÀ» È¿À²ÀûÀ¸·Î ¹Ý¿µÇÔÀ¸·Î½á ½Ö°î¼±Çü ÀûºÐ º¸Á¸ÇüÀÇ 2Â÷¿ø õ¼ö¹æÁ¤½ÄÀ» ÇØ¼®ÇÏ¿´´Ù. Fractional Step Method¸¦ Àû¿ëÇÑ À¯ÇÑüÀû±â¹ýÀÇ »ç¿ëÀ» À§ÇØ HLL Riemann ÇØ¹ýÀ» ÀÌ¿ëÇÏ¿© È帧·üÀ» °è»êÇÏ¿´°í, ½Ã°£ ¹× °ø°£¿¡ ´ëÇÑ 2Â÷ Á¤È®µµ¸¦ ¸¸Á·Çϱâ À§ÇØ MUSCL ±â¹ýÀ» Àû¿ëÇÏ¿´´Ù. 2Â÷ Á¤È®µµÀÇ »ç¿ëÀ¸·Î ºÒ¿¬¼ÓÁöÁ¡¿¡¼ ¹ß»ýÇÏ´Â ¼öÄ¡Áøµ¿Àº TVD ±â¹ý Àû¿ëÀ»ÅëÇØ Á¦¾îÇÏ¿´´Ù. °³¹ßµÈ¸ðÇüÀº 2Â÷¿ø Á¦¹æ ºØ±« ¹× ´ïÇÏ·ùºÎ¿¡ ±¸Á¶¹°ÀÌ Á¸ÀçÇÏ´Â °æ¿ìÀÇ´ï ºØ±« ¸ðÀǸ¦ ÅëÇØ½ÇÃøÄ¡¿ÍÀÇ °ËÁõÀ» ½Ç½ÃÇÏ¿´´Ù. ¶ÇÇÑ ÇÏ·ùºÎ¿¡ ¿ª°æ»ç°¡ Á¸ÀçÇÏ´Â °æ¿ìÀÇ ´ï ºØ±« ¸ðÀǸ¦ ÅëÇØ ½ÇÃøÄ¡¿Í ºñ±³ÇÔÀ¸·Î½á »ý¼ºÇ×ÀÇ ¿µÇâ¿¡ ´ëÇÑ ¸ðÇüÀÇ Àû¿ë¼ºÀ» °ËÁõÇÏ¿´´Ù. |
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Two dimensional numerical model of high-order accuracy is developed to analyze complex flow including transition flow, discontinuous flow, and wave propagation to dry bed emerging at natural river flow. The bed slope term of two dimensional shallow water equation consisting of integral conservation law is treated efficiently by applying quasi-steady wave propagation scheme. In order to apply Finite Volume Method using Fractional Step Method, MUSCL scheme is applied based on HLL Riemann solver, which is second-order accurate in time and space. The TVD method is applied to prevent numerical oscillations in the second-order accurate scheme. The developed model is verified by comparing observed data of two dimenstional levee breach experiment and dam breach experiment containing structure at lower section of channel. Also effect of the source term is verified by applying to dam breach experiment considering the adverse slope channel. |
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Ű¿öµå |
Áؼ±Çü ÀüÆÄÇØ¼®±â¹ý;HLL ¸®¸¸Çعý;»ý¼ºÇ×;Quasi-steady wave propagation scheme;fractional step method;HLL Riemann solver;source term; |
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Çѱ¹¼öÀÚ¿øÇÐȸ³í¹®Áý / v.44, no.2, 2011³â, pp.145-156
Çѱ¹¼öÀÚ¿øÇÐȸ
ISSN : 1226-6280
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO201108863881021)
¾ð¾î : Çѱ¹¾î |
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³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø |
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