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Çѱ¹¼öÀÚ¿øÇÐȸ / v.21, no.1, 1988³â, pp.67-76
À¯ÇÑ¿ä¼Ò¹ýÀ» ÀÌ¿ëÇÑ °³¼ö·Î´Ü¸é±ÞÈ®´ëºÎÀÇ ¼øÈ¯Çö»óÇØ¼®
( Finite Element Analysis for Circulation Phenomena in Sudden Expansion of Open Channel )
À±ÅÂÈÆ;¼­½Â¿ø; ÇѾç´ëÇб³ Åä¸ñ°øÇаú;Çѱ¹°úÇбâ¼ú¿ø ¿¬±¸¿ø;
 
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¼ö½É¿¡ ´ëÇÏ¿© Æò±ÕÀ» ÃëÇÑ 2Â÷¿ø ¿¬¼Ó¹æÁ¤½Ä ¹× ¿îµ¿¹æÁ¤½Ä¿¡ GalerkinÇü À¯ÇÑ¿ä¼Ò¹ýÀÌ Àû¿ëµÇ¾î °³¼ö·Î ´Ü¸é±ÞÈ®´ëºÎÀÇ ¼øÈ¯Çö»óÀ» ÇØ¼®ÇÏ¿´´Ù. ¸ðÇüÀÇ Å¸´ç¼º½ÇÇèÀÌÇàÇÏ¿©Áø ´Ü¼øÇÑ ¼ö·Î¿¡¼­ÀÇ ÆÄµ¿½ÇÇè°á°ú, º» ¸ðÇüÀÌ L2¿ÀÂ÷ 0.5% À̳»¿¡¼­ ¸¸Á·½º·´°Ô ¼ö·ÅÇÐ ÀÖÀ¸¸ç, ´ïÆÄ±«½Ã ¼ö¸é°î¼±Çؼ®¿¡¼­µµ ¼öÄ¡ÇØ¿Í Á¤È®µµ°¡ °ÅÀÇ ÀÏÄ¡ÇÏ´Â¸Å¿ì ¾çÈ£ÇÑ °á°ú°¡ µµÃâµÇ¾î ¸ðÇüÀÇ Å¸´ç¼º ¹× À¯¿ë¼ºÀÌ Á¦½ÃµÈ´Ù. ¼øÈ¯È帧 ÇØ¼®½Ã ÃʱâÁ¶°ÇÀ¸·Î ÁÖ¼ö·ÎºÎÀÇ È帧À» Á¤ÀÇÇÏ´Â »õ·Î¿î Á¶°ÇÀÌ µµÀԵǾî ÀÌ¿ëµÇ¾ú°í, Ãøº®°æ°èÁ¶°ÇÀ¸·Î´Â Neumann Á¶°Ç À̿ܿ¡ slip Á¶°ÇÀ» ÃëÇÏ¿© ½ÇÇèÇÑ °á°ú slip Á¶°ÇÀÌ no-slip Á¶°ÇÀÏ ¶§ÀÇ °­ÇÑ °æ°èÃþÀ» ¹èÁ¦Çϴ Ÿ´çÇÑ Ãøº°°æ°èÁ¶°ÇÀ¸·Î ÆÇ´ÜµÈ´Ù. º» ¸ðÇüÀ» °³¼ö·Î´Ü¸é±ÞÈ®´ëºÎ¿¡ Àû¿ëÇÑ °á°ú ÇÏ»ó¸¶Âû ¹× À¯È¿Àü´Ü¿¡ ±âÀÎµÈ ³­·ùÀÇ ¿µÇâÀº Å©Áö ¾ÊÀº ¹Ý¸é À̼۰¡¼Óµµ´Â ¼øÈ¯È帧¿¡ Áö´ëÇÑ ¿µÇâÀ» ¹ÌÄ¡´Â °ÍÀ¸·Î ³ªÅ¸³µ´Ù.
Analyzed was the circulation phenomena in the open channel with sudden expansion, by applying the Galerkin's finite element method to the depth-averaged 2-dimensional continuity and momentum equations. Wave tests were done in the simplified channel in order to review the validity of this newly developed model and the computed results were within 0.5% of $L_2$-norm error, and application of this model to the simulation of simplified dam-break gave very close results compared with the analytical solution, thus, it can be concluded that this model is valid and efficient. The main flow in the expanded channel was defined as a new initial condition with given velocity and the flow in the expanded portion was at rest in simulating the circulation, and besides the Neumann's condition the slip boundary condition for lateral wall was found to be proper condition than the no-slip condition. It can be concluded, from the numerical tests in the sudden expension, that the circulating phenomena depend mainly on the convective inertia and the effect of turbulence due to bottom shear and lateral shear is insignificant.
 
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Çѱ¹¼öÀÚ¿øÇÐȸÁö / v.21, no.1, 1988³â, pp.67-76
Çѱ¹¼öÀÚ¿øÇÐȸ
ISSN : 1738-9488
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO198811920092211)
¾ð¾î : Çѱ¹¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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