基于FLUENT的单个透空四面体三维数值模拟

Three-dimensional Numerical Simulation of Flow around Square Cylinder Stratified by Height Based on FLUENT

针对透空四面体按高度分层后形成等边三角形布置的三方柱绕流问题,基于FLUENT进行了三维数值模拟,分析了不同高度下流场分布和不同流速下阻力特性,进一步揭示了透空四面体减速落淤机理。结果表明,三维数值模拟结果与分层后的二维数值模拟结果表现出相似性;不同水位下透空四面体后面两根杆件尾流区流场分布区别较大,在水位h=600 mm时,减速区域大且减速效果最明显;不同流速下的阻力系数的变化规律不同,最后均稳定在常数值1.55左右;投放透空四面体后整个流场挟沙能力的衰减区主要体现在尾流区。

Three-dimensional numerical simulation of the three-column flow around the permeable tetrahedron was carried out by FLUENT. The flow field distribution at different heights and the resistance characteristics at different flow rates were analyzed,and the mechanism of drop deposition of the permeable tetrahedral was further revealed. Some conclusions are obtained through numerical simulation: The results of three-dimensional numerical simulation are similar to those of two-dimensional numerical simulation; The distribution of the flow field in the wake zone of the two rods is different under different water level conditions. When h = 600 mm,the deceleration area is the most obvious and the deceleration effect is the most obvious; The resistance coefficients at different flow rates show different variation rules,and finally stabilize at a constant value of about 1.55; The attenuation zone of the whole sedimentation capacity is mainly reflected in the wake area after setting the permeable tetrahedron.