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Çѱ¹¼öÀÚ¿øÇÐȸ / v.29, no.4, 1996³â, pp.187-198
³­·ùÀü´Ü È帧¿¡¼­ÀÇ ºñÁ¤»ó ¼öÆò ¼±¿À¿°¿øÀÇ È®»ê¿¡ °üÇÑ ¼öÄ¡ÇØ¹ý
( A Numerical Method for Dispersion of Unsteady Horizontal Line Source in Turbulent Shear Flow )
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³­·ùÀü´Ü È帧¿¡¼­ÀÇ ºñÁ¤»ó ¼öÆò ¼±¿À¿°¿øÀÇ È®»ê¿¡ °üÇÑ ¼öÄ¡¸ðÇüÀ» °³¹ßÇÏ¿´´Ù. °è»ê±â¹ýÀ¸·Î´Â ºñÁ¤»ó À̼ÛÈ®»ê ¹æÁ¤½ÄÀ» Á¾¹æÇâ ÀÌ¼Û ¹× ¿¬Á÷¹æÇâ È®»êÀ¸·Î ºÐ¸®Çϰí, ÀÌµé ¹æÁ¤½ÄÀ» ¹æ½Ã°£ °£°Ý¿¡ ´ëÇÏ¿© ¹ø°¥¾Æ °è»êÇÏ´Â ´Ü°èºÐ¸® À¯ÇÑÂ÷ºÐ±â¹ýÀ» »ç¿ëÇÏ¿´´Ù. Á¾¹æÇâ À̼۹æÁ¤½Ä¿¡ ´ëÇØ¼­´Â Holly-Preissmann ±â¹ýÀ», ¿¬Á÷¹æÇâ È®»ê¹æÁ¤½Ä¿¡ ´ëÇØ¼­´Â Crank-Nicholson ±â¹ýÀ» °¢°¢ Àû¿ëÇÏ¿´´Ù. °³¹ßµÈ ¸ðÇüÀ» ³­·ùÀü´Ü È帧¿¡¼­ÀÇ Á¤»ó ¼öÆò ¼±¿À¿°¿øÀÇ È®»ê ¹®Á¦¿¡ Àû¿ëÇÏ¿© °è»ê°á°ú¸¦ ¹ÝÇØ¼®ÇØ¿Í ºñ±³ÇÔÀ¸·Î½á ¸ðÇüÀ» °ËÁõÇÏ¿´´Ù. ¶ÇÇÑ ³­·ùÀü´Ü È帧³»·Î ¼ø°£ÀûÀ¸·Î ¹æ·ùµÈ ¸é¿À¿°¿øÀÇ È®»ê¹®Á¦¿¡ °è»ê¸ðÇüÀ» Àû¿ëÇÏ¿´´Ù. ¸¶Âû°è¼ö¿¡ ´ëÇÑ ¹Î°¨µµ ºÐ¼® °á°ú, µ¿ÀÏÇÑ ¹«Â÷¿ø ½Ã°¢¿¡¼­ÀÇ È¥ÇÕ Á¤µµ´Â ¸¶Âû°è¼ö¿¡ °ü°è¾øÀÌ °ÅÀÇ ÀÏÁ¤ÇÑ °ÍÀ¸·Î ³ªÅ¸³µ´Ù. ¶ÇÇÑ µ¿ÀÏÇÑ Á¤µµÀÇ È¥ÇÕ»óÅ¿¡ µµ´ÞÇÏ´Â µ¥ ¼Ò¿äµÇ´Â À¯ÇϰŸ®´Â ¸¶Âû°è¼öÀÇ Á¦°ö±Ù¿¡ ¹Ýºñ·ÊÇÔÀ» ¾Ë ¼ö ÀÖ¾ú´Ù.
A numerical model for unsteady dispersion of horizontal line source in turbulent shear flow is developed. A fractional step finite difference method is used which splits the unsteady two-dimensional advective diffusion equation into the longitudinal advection and the vertical diffusion equations, and solves them alternately for half time intervals by the Holly-Preissmann scheme and the Crank-Nicholson scheme, respectively. The developed numerical model is verified using a semi-analytic solution for steady dispersion in turbulent shear flow. Dispersion of an instantaneous plane source in turbulent shear flow is analyzed using the model. The degree of mixing at the same dimensionless time is almost the same regardless of the friction factor, and the travel distance required to reach a certain degree of mixing is inversely proportional to the square root of the friction factor.
 
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Çѱ¹¼öÀÚ¿øÇÐȸÁö / v.29, no.4, 1996³â, pp.187-198
Çѱ¹¼öÀÚ¿øÇÐȸ
ISSN : 1738-9488
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO199611920097582)
¾ð¾î : Çѱ¹¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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