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Çѱ¹¼öÀÚ¿øÇÐȸ / v.42, no.12, 2009³â, pp.1079-1089
Unsplit ±â¹ýÀ» Àû¿ëÇÑ È帧À²°ú »ý¼ºÇ×ÀÇ Ã³¸®±â¹ý
( Handling Method for Flux and Source Terms using Unsplit Scheme )
±èº´Çö;ÇѰǿ¬;±èÁö¼º; °æºÏ´ëÇб³ °ø°ú´ëÇÐ °ÇÃà.Åä¸ñ°øÇкΠBK21»ç¾÷´Ü;°æºÏ´ëÇб³ °ø°ú´ëÇÐ °ÇÃà.Åä¸ñ°øÇкÎ;Çѱ¹°Ç¼³±â¼ú¿¬±¸¿ø ÇÏÃµÇØ¾È¿¬±¸½Ç;
 
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º» ¿¬±¸¿¡¼­´Â ¸¶¸¥Çϵµ ¹× º¹ÀâÇÑ ÁöÇü¿¡¼­ÀÇ ÆÄÀÇ ÀüÆÄ¿Í °°Àº ¼ö°øÇÐ ºÐ¾ß¿¡¼­ ÇØ°áÇϱ⠾î·Á¿î ¹®Á¦¸¦ ÇØ¼®Çϱâ À§ÇÑ °íÁ¤È®µµ 2Â÷¿ø ¼öÄ¡¸ðÇüÀ» °³¹ßÇϱâ À§ÇØ, unsplit À¯ÇÑüÀû±â¹ý°ú HLLC Riemann ÇØ¹ýÀ» ÀÌ¿ëÇÑ È帧À² °è»êÀ¸·Î ½Ö°î¼±Çü ÀûºÐ º¸Á¸ÇüÀÇ 2Â÷¿ø õ¼ö¹æÁ¤½ÄÀ» ÇØ¼®ÇÏ¿´´Ù. Unsplit ±â¹ýÀÇ Àû¿ëÀ» À§ÇØ ÇÏ»ó°æ»çÇ×Àº ¹ß»êÁ¤¸®¸¦ ÀÌ¿ëÇÏ¿© ÀÌ»êÈ­ÇÑ ÇüŸ¦ Àû¿ëÇÏ¿´À¸¸ç, È帧À²°ú »ý¼ºÇ×ÀÇ ±ÕÇüÀ» ÀÌ·ç±â À§ÇØ ¼ö¸é°æ»ç¹ýÀ» ½Ã°£°ú °ø°£¿¡ ´ëÇØ 2Â÷Á¤È®µµ¸¦ °¡Áö´Â MUSCL ±â¹ý°ú ¿¬°èÇÏ¿´´Ù. ±×¸®°í Àû¿ëÇÑ »ý¼ºÇ× Ã³¸®±â¹ý°ú È帧À²°úÀÇ º¸Á¸Æ¯¼ºÀÌ ¸¸Á·ÇÔÀ» º¸¿´´Ù. 2Â÷Á¤È®µµÀÇ »ç¿ëÀ¸·Î ºÒ¿¬¼Ó ÁöÁ¡¿¡¼­ ¹ß»ýÇÒ ¼ö ÀÖ´Â ¼öÄ¡Áøµ¿À» Á¦°ÅÇϱâ À§Çؼ­ °æ»çÁ¦ÇÑÀÚ¸¦ »ç¿ëÇÑ TVD ±â¹ýÀ» Àû¿ëÇÏ¿´´Ù. °³¹ß¸ðÇüÀ» Á¤È®Çذ¡ Á¸ÀçÇÏ´Â »ý¼ºÇ×ÀÌ ¾ø´Â 1Â÷¿ø ´ï ºØ±« È帧¿¡ Àû¿ëÇÏ¿© È帧À² °è»êÀÇ Á¤È®¼ºÀ» °ËÁõÇÏ¿´°í, ÇÏ»óÀ¶±â¸¦ °¡Áø ÇϵµÀÇ Á¤»ó·ù ¹× õÀÌ·ù ¸ðÀǸ¦ ÅëÇØ °³¹ß¸ðÇüÀÇ º¸Á¸Æ¯¼ºÀ» °ËÁõÇÏ¿´À¸¸ç, ÇÏ»ó°æ»ç ¹× ´Ü¸éÀÇ È®´ë/Ãà¼Ò±¸°£ÀÌ Á¸ÀçÇÏ´Â 2Â÷¿ø ´ï ºØ±« È帧¿¡ Àû¿ëÇÏ¿© °³¹ß¸ðÇüÀÇ Àû¿ë¼ºÀ» °ËÁõÇÏ¿´´Ù.
The objective of this study is to develop the accurate, robust and high resolution two-dimensional numerical model that solves the computationally difficult hydraulic problems, including the wave front propagation over dry bed and abrupt change in bathymetry. The developed model in this study solves the conservative form of the two-dimensional shallow water equations using an unsplit finite volume scheme and HLLC approximate Riemann solvers to compute the interface fluxes. Bed-slope term is discretized by the divergence theorem in the framework of FVM for application of unsplit scheme. Accurate and stable SGM, in conjunction with the MUSCL which is second-order-accurate both in space and time, is adopted to balance with fluxes and source terms. The exact C-property is shown to be satisfied for balancing the fluxes and the source terms. Since the spurious oscillations in second-order schemes are inherent, an efficient slope limiting technique is used to supply TVD property. The accuracy, conservation property and application of developed model are verified by comparing numerical solution with analytical solution and experimental data through the simulations of one-dimensional dam break flow without bed slope, steady transcritical flow over a hump and two-dimensional dam break flow with a constriction.
 
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unsplit ±â¹ý;»ý¼ºÇ×;MUSCL ±â¹ý;¼ö¸é°æ»ç¹ý;º¸Á¸Æ¯¼º;unsplit scheme;source terms;MUSCL scheme;SGM;conservation property;
 
Çѱ¹¼öÀÚ¿øÇÐȸ³í¹®Áý / v.42, no.12, 2009³â, pp.1079-1089
Çѱ¹¼öÀÚ¿øÇÐȸ
ISSN : 1226-6280
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200903538424649)
¾ð¾î : Çѱ¹¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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