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Çѱ¹¼öÀÚ¿øÇÐȸ / v.21, no.2, 1988³â, pp.173-182
St. Venant½Ä¿¡ °üÇÑ À¯ÇÑ Â÷ºÐ¹ýÀÇ ºñ±³ ºÐ¼®
( Comparative Analysis of Finitc Difference Methods for the St, Venant Equation )
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St. Venant½Ä¿¡¼­ »ó´ëÀûÀ¸·Î ¸¶Âû°æ»çÇ×ÀÌ Å©°í ¿¬¼ÓÀû ÆÄÇüÀÌ À¯ÀÔÇÏ´Â °æ¿ì¿Í ±Þ°ÝÇÑ ºÒ¿¬¼Ó ºÎÀ§¸¦ °¡Áø Ãæ°ÝÆÄ°¡ À¯ÀÔÇÏ´Â °æ¿ì¿¡ À¯ÇÑÂ÷ºÐ ¼öÄ¡ÇØÀÇ Æ¯¼ºÀ» ºñ±³ÇÏ¿´´Ù. ±× °á°ú ´ÜÀÏ Áõ°¨ÆÄ¿¡´Â Keller Box ÇØ¹ýÀÌ $0.5{leq}{ heta}{leq}1.0$, ${ heta}+{psi}$=1·Î µÎ ¸Å°³º¯¼ö¸¦ Á¤ÇßÀ» ¶§ Á¤È®µµ¿Í È¿À²¼º, ¾ÈÀü¼ºÀÇ Ãø¸é¿¡¼­ °¡Àå ÁÁ¾Ò´Ù. ±×·¯³ª Ãæ°ÝÆÄ¿¡¼­´Â Preissmann ÇüÅÂÀÇ ¸Å°³º¯¼ö ${psi}$(=0.5)¸¦ »ç¿ëÇÏ¿©¾ß¸¸ ¾ÈÁ¤ÇÏ¿´´Ù. Lax-Wendroff, Richtmyer ÇØ¹ýÀº Leap Frog¿¡ ºñÇØ ¾ÈÁ¤¼º¿¡¼­, Lax-Fredrich ÇØ¹ý¿¡ ºñÇØ Á¤È®¼º¿¡¼­ ´õ ÁÁÀº ¹æ¹ýÀÓÀÌ ´ÜÀÏ Áõ°¨ÆÄÀÇ ¼öÄ¡½ÇÇè¿¡¼­ ³ªÅ¸³µ°í, Ãæ°ÝÆÄ¿¡¼­´Â Lax-Fredrich°¡ ´Ù¸¥ ¾çÇØ¹ýµé¿¡ ºñÇØ °úµµÇÑ ¼öÄ¡Àû dissipationÀ» Leap FrogÀº ´À¸° Áú·®Àü´ÞÀ» º¸¿´´Ù.
Characteristics of finite difference schemes for St. Venant equation were compared with two input cases. One is the monoclinal wave which has large friction slope without discontinuity and the other is the shock wave with discontinuity. For monoclinal wave, Keller Box scheme is the best in terms of accuracy, efficiency and stability when two parameters were selected with a rele : $0.5{leq}{ heta}{leq}1.0$, ${ heta}+{psi}$=1, But for shock wave only the Preissmann type of parameter ${psi}$(=0.5) showed stable results. Numerical experiments of monoclinal wave showed that Lax-Wendroff and Richtmyer schemes were more stable than leap Frog and more accurate than Lax-Fredrich scheme. For shock wave Lax-Fredrich showed larger numerical dissipation than other explicit schemes and Leap Frog produced slower mass transport.
 
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Çѱ¹¼öÀÚ¿øÇÐȸÁö / v.21, no.2, 1988³â, pp.173-182
Çѱ¹¼öÀÚ¿øÇÐȸ
ISSN : 1738-9488
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO198811920092331)
¾ð¾î : Çѱ¹¾î
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