水道港口
水道港口
수도항구
JOURNAL OF WATERWAY AND HARBOR
2014年
3期
227-233
,共7页
沈立龙%刘明维%吴林键%李鹏飞%舒丹
瀋立龍%劉明維%吳林鍵%李鵬飛%舒丹
침립룡%류명유%오림건%리붕비%서단
亚临界雷诺数%圆柱和方柱%绕流%数值模拟%RNG k-ε模型
亞臨界雷諾數%圓柱和方柱%繞流%數值模擬%RNG k-ε模型
아림계뢰낙수%원주화방주%요류%수치모의%RNG k-ε모형
sub-critical Reynolds numbers%circular and square cylinder%flow around body%numerical simula-tion%RNG k-εmodel
基于RNG k-ε模型，采用有限体积法对亚临界雷诺数条件下(Re=3×102~3×105)的二维单圆柱和单方柱绕流进行数值模拟与仿真。得到了圆柱和方柱绕流阻力系数Cd与Strouhal数随雷诺数的变化规律。同时对雷诺数Re=22000下的圆柱、方柱绕流相关特性进行详细对比分析。计算结果表明：同一雷诺数下，单圆柱绕流阻力系数Cd较单方柱低，但圆柱的Strouhal数较单方柱则要高。虽然二者边界层分离点不同，但流场的演变与漩涡的脱落具有一定相似特性。
基于RNG k-ε模型，採用有限體積法對亞臨界雷諾數條件下(Re=3×102~3×105)的二維單圓柱和單方柱繞流進行數值模擬與倣真。得到瞭圓柱和方柱繞流阻力繫數Cd與Strouhal數隨雷諾數的變化規律。同時對雷諾數Re=22000下的圓柱、方柱繞流相關特性進行詳細對比分析。計算結果錶明：同一雷諾數下，單圓柱繞流阻力繫數Cd較單方柱低，但圓柱的Strouhal數較單方柱則要高。雖然二者邊界層分離點不同，但流場的縯變與漩渦的脫落具有一定相似特性。
기우RNG k-ε모형，채용유한체적법대아림계뢰낙수조건하(Re=3×102~3×105)적이유단원주화단방주요류진행수치모의여방진。득도료원주화방주요류조력계수Cd여Strouhal수수뢰낙수적변화규률。동시대뢰낙수Re=22000하적원주、방주요류상관특성진행상세대비분석。계산결과표명：동일뢰낙수하，단원주요류조력계수Cd교단방주저，단원주적Strouhal수교단방주칙요고。수연이자변계층분리점불동，단류장적연변여선와적탈락구유일정상사특성。
With the RNG k-εmodel and the finite volume method,the flow around a two-dimensional circular cylinder and a two-dimensional square cylinder at sub-critical Reynolds numbers was simulated and evaluated, and the trends of drag coefficients and Strouhal numbers with the change of Reynolds numbers from 3×102 to 3×105 were obtained. Meanwhile, characteristics of the flow around a circular cylinder and a square cylinder at Re = 22 000 have been compared and analyzed in detail. Calculation results show that drag coefficient of flow around a circular cylinder is lower than the drag coefficient of flow around a square cylinder with the same Reynold number. Howev-er, the Strouhal number of flow around a circular cylinder is slightly higher than the Strouhal number of flow around a square cylinder. Though their boundary layer separation points are different, the flow field evolution and the vor-tex shedding of two cylinders have some similarities.
