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Çѱ¹¼öÀÚ¿øÇÐȸ / v.43, no.9, 2010³â, pp.801-811
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³»ºÎÁ¶ÆÄ±â¹ýÀ» Ȱ¿ëÇÑ Navier-Stokes ¹æÁ¤½Ä ¸ðÇüÀÇ °í¸³ÆÄ ó¿À¸§ ¼öÄ¡¸ðÀÇ
( Numerical Simulation of Solitary Wave Run-up with an Internal Wave-Maker of Navier-Stokes Equations Model ) |
ÇÏŹÎ;±èÇüÁØ;Á¶¿ë½Ä; ÇѾç´ëÇб³ ÀϹݴëÇпø °Ç¼³È¯°æ°øÇаú;ÇѾç´ëÇб³ ÀϹݴëÇпø °Ç¼³È¯°æ°øÇаú, Çѱ¹°Ç¼³±â¼ú¿¬±¸¿ø ÇÏõ.ÇØ¾ÈÇ׸¸¿¬±¸½Ç;ÇѾç´ëÇб³ °ø°ú´ëÇÐ °Ç¼³È¯°æ°øÇаú;
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±Þ°æ»ç¿¡¼ÀÇ °í¸³ÆÄÀÇ Ã³¿À¸§À» ¿¹ÃøÇϱâ À§ÇØ 3Â÷¿ø ¼öÄ¡¸ðÇü¿¡ ³»ºÎÁ¶ÆÄ±â¹ýÀ» µµÀÔÇÏ¿© ¼öÄ¡¸ðÇü½ÇÇèÀ» ¼öÇàÇÏ¿´´Ù. ¼öÄ¡¸ðÇüÀº Navier-Stokes ¹æÁ¤½ÄÀ» À¯ÇÑÂ÷ºÐ¹ýÀ» ÀÌ¿ëÇÏ¿© °è»êÇÏ´Â µ¿¼ö¾Ð ¸ðÇüÀ¸·Î¼, ³·ùÀÇ ÇØ¼®À» À§Çؼ »ó´ëÀûÀ¸·Î Å« ¿¡µð(eddy)¸¸À» °í·ÁÇÏ´Â SANS(spatially averaged Navier-Stokes) ¹æÁ¤½ÄÀ» Ǫ´Â LES(large-eddy-simulation) ±â¹ÝÀÇ ¼öÄ¡¸ðÇüÀ» »ç¿ëÇÑ´Ù. ¾ù°¥¸² °ÝÀÚü°è¿¡¼ À¯ÇÑÂ÷ºÐ¹ýÀ» »ç¿ëÇÏ¿© Áö¹è¹æÁ¤½ÄÀ» ÇØ¼®ÇÏ´Â ¸ðÇüÀ¸·Î¼ ¼öÄ¡±â¹ýÀ¸·Î Two-step projection ±â¹ýÀ» »ç¿ëÇÏ¿© SANS ¹æÁ¤½ÄÀ» Ç®¾úÀ¸¸ç, Poisson ¹æÁ¤½ÄÀ»Bi-CGSTAB ±â¹ýÀ» ÀÌ¿ëÇÏ¿© Ç®°í ¾Ð·ÂÀåÀ» °è»êÇÏ¿´´Ù. ¶ÇÇÑ, ÀÚÀ¯¼ö¸éÀÇ ÃßÀûÀ» À§ÇÏ¿© 2Â÷ Á¤È®µµÀÇ VOF(volume-of-fluid) ±â¹ýÀ» »ç¿ëÇÏ¿´´Ù. ¸ÕÀú °í¸³ÆÄ¸¦ 3Â÷¿ø °ø°£ÀÇ ÀÏÁ¤ ¼ö½É»ó¿¡¼ ³»ºÎÁ¶ÆÄÇÏ¿© ÇØ¼®ÇØ¿Í ºñ±³ÇÑ ÈÄ ºÐ»ê¿ÀÂ÷¿¡ ´ëÇØ ºÐ¼®ÇÏ¿´´Ù. ±×¸®°í °í¸³ÆÄ¸¦ ³»ºÎÁ¶ÆÄÇÏ¿© ±Þ°æ»ç¿¡¼ÀÇ °í¸³ÆÄÀÇ Ã³¿À¸§ ¹× 󳻸² Çö»óÀ» ¿¹ÃøÇÏ°í ¼ö¸®¸ðÇü ½ÇÇè°á°ú¿Í ºñ±³ ¹× ºÐ¼®ÇÏ¿´´Ù. |
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A three-dimensional numerical model called NEWTANK is employed to investigate solitary wave run-up with an internal wave-maker on a steep slope. The numerical model solves the spatially averaged Navier-Stokes equations for two-phase flows. The LES (large-eddy-simulation) approach is adopted to model the turbulence effect by using the Smagorinsky SGS (sub-grid scale) closure model. A two-step projection method is adopted in numerical solutions, aided by the Bi-CGSTAB (Bi-Conjugate Gradient Stabilized) method to solve the pressure Poisson equation for the filtered pressure field. The second-order accurate VOF (volume-of-fluid) method is used to track the distorted and broken free surface. A solitary wave is first internally generated and propagated over a constant water depth in the three-dimensional domain. Numerically predicted results are compared with analytical solutions and numerical errors are analyzed in detail. The model is then applied to study solitary wave run-up on a steep slope and the obtained results are compared with available laboratory measurements. |
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Ű¿öµå |
³»ºÎÁ¶ÆÄ;Navier-Stokes ¹æÁ¤½Ä;°í¸³ÆÄ;ó¿À¸§;internal wave-maker;navier-stokes equations;NEWTANK;solitary wave;run-up; |
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Çѱ¹¼öÀÚ¿øÇÐȸ³í¹®Áý / v.43, no.9, 2010³â, pp.801-811
Çѱ¹¼öÀÚ¿øÇÐȸ
ISSN : 1226-6280
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO201028552428566)
¾ð¾î : Çѱ¹¾î |
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³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø |
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