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Çѱ¹¼öÀÚ¿øÇÐȸ / v.30, no.2, 1997³â, pp.143-154
¿¬»êÀÚ ºÐ¸®±â¹ý¿¡ ÀÇÇÑ 1Â÷¿ø À̼Û-È®»ê¹æÁ¤½ÄÀÇ ¼öÄ¡¸ðÇü
( Numerical Model of One-Dimensional Advection-Diffusion Equation Applying Split-Operator Method )
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À̼ÛÇ׿¡´Â 5Â÷ º¸°£´ÙÇ×½ÄÀ» »ç¿ëÇÏ´Â Holly-Pressmann ±â¹ýÀ», È®»êÇ׿¡´Â Hobson µîÀÌ Á¦¾ÈÇÑ ¾çÇØ¹ýÀ» »ç¿ëÇÏ´Â ¿¬»êÀÚ ºÐ¸®±â¹ýÀ» »ç¿ëÇÏ¿© 1Â÷¿ø À̼Û-È®»ê¹æÁ¤½ÄÀÇ ¼öÄ¡¸ðÇüÀ» Á¦¾ÈÇÏ¿´´Ù. Á¦¾ÈµÈ ¸ðÇüÀ» °ËÁ¤Çϱâ À§ÇÏ¿© ÀÏÁ¤ÇÑ À¯¼Ó°ú Á¾È®»ê°è¼ö¸¦ °®´Â ¼ø°£ÀûÀ¸·Î ºÎÇÏµÈ ¿À¿°¿øÀÇ °æ¿ì¿Í »ó·ù´Ü¿¡ ¿¬¼ÓÀûÀÎ ¿À¿°¿øÀ» °®´Â °æ¿ì¿¡ ´ëÇÏ¿© º» ¸ðÇüÀÇ ÇØ¸¦ ÇØ¼®ÇØ¿Í ±âÁ¸ÀÇ ¸ðÇüÀ¸·ÎºÎÅÍ ±¸ÇÑ ÇØ¸¦ ºñ±³°ËÅäÇÏ¿´´Ù. Courant ¼ö¿Í Peclet ¼ö¸¦ °¡Áø °æ¿ì¿¡ ´ëÇÑ ¼öÄ¡ÇØ¼®À» ÅëÇÏ¿©, º» ¸ðÇüÀÌ Courant ¼ö°¡ 1º¸´Ù Å« °æ¿ì¿¡ ´ëÇØ¼­µµ ¾ÈÁ¤µÈ ÇØ¸¦ Á¦°øÇÔÀ» ¾Ë ¼ö ÀÖ¾úÀ¸¸ç, ÇØ¼®Çذ¡ Á¸ÀçÇÏ´Â °æ¿ì¿¡ º» ¸ðÇüÀ» Àû¿ëÇÏ¿© ¾òÀº ¼öÄ¡ÇØ¿Í ºñ±³ÇÑ ¹Ù Àü¹ÝÀûÀ¸·Î Àß ÀÏÄ¡ÇÏ¿´´Ù. º» ¸ðÇüÀÇ È®»êÇ׿¡ »ç¿ëµÈ ¾çÇØ¹ý¿¡¼­´Â ÀϹÝÀûÀÎ ¾çÇØ¹ýÀÇ ´ÜÁ¡ÀÎ °è»ê½Ã°£°£°ÝÀÇ Á¦¾àÀÌ »ó´çÈ÷ ¿ÏÈ­µÇ¾î »ó´ëÀûÀ¸·Î Å« °è»ê½Ã°£°£°Ý¿¡ ´ëÇØ¼­µµ ¾çÈ£ÇÑ °á°ú¸¦ º¸¿´´Ù.
A numerical model for solving advection-diffusion equation is presented by splitoperator method combining the Holly-Preissmann scheme with a fifth-degree interpolating polynomial for advection operator and the explicit scheme porposed by Hobson et al. for diffusion operator. To examine the developed model, the obtained numerical solutions are compared with both the analytic solution and those from the existing models for the instantaneous source (Gaussian hill) and the continuous source (advanced front) at upstream boundary with constant velocity and diffusivity condition. For the various cases having different Courant and Peclet numbers, it is shown that the present study provides stable solutions even for Courant numbers exceeding one. The result obtained by the present study also agree well with existing analytical solutions for both cases. The proposed explicit scheme somewhat releases the conventional restriction of explicit schemes for determining the time step size and provides satisfactory results for relatively large time step size.
 
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Çѱ¹¼öÀÚ¿øÇÐȸ³í¹®Áý / v.30, no.2, 1997³â, pp.143-154
Çѱ¹¼öÀÚ¿øÇÐȸ
ISSN : 1226-6280
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO199711920100114)
¾ð¾î : Çѱ¹¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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