Application of multiscale turbulent model in cylinder flow
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摘要: 使用基于可变时间间隔平均方法的多尺度湍流模型，对高超临界区雷诺数下非定常圆柱绕流进行了数值模拟.结果表明：多尺度湍流模型在升阻力系数预测上与实验值一致，而标准k-ε模型和SST（shear stress transport）k-ω模型却只能兼顾其一；在旋涡脱落特性预测上与实验值相一致，其误差小于SST k-ω模型的5.8%和标准k-ε模型的37.6%；在表面平均压力系数分布预测上其误差仅为3.6%，明显优于SST k-ω模型的13%和标准k-ε模型的53.7%；在表面摩擦因数分布及分离角度方面与实验结果相吻合，且分离角度误差仅为0.78%，结果优于标准k-ε模型的1.04%和SST k-ω模型的1.83%，充分验证了该湍流模型应用于复杂湍流模拟预报的潜力.Abstract: The unsteady flow around a smooth cylinder under the supper-transition flow region Reynolds number was simulated using the multiscale turbulent model based on the variable interval time average method.The computational results show that the multiscale turbulent model can successfully simulate the lift and drag coefficients,however, standard k-ε model and SST k-ω model can only accurately simulate one of them.This model can also accurately predict vortex shedding characteristics, and its error is smaller than 5.8% of SST k-ω model and 37.6% of standard k-ε model.Also,for the prediction of surface mean pressure coefficient distribution,the error of multiscale turbulent model is only 3.6%,however,the predicted errors using SST k-ω model and standard k-ε model increase to 13% and 53.7%.For the prediction of surface friction factor distribution and the separation angle,the error of separation angle of multiscale turbulent model is only 0.78%.Correspondingly,the predicted errors of standard k-ε model and SST k-ω model are 1.04% and 1.83%.Compared with the experimental results,the results of the multiscale turbulent model are better than those of standard k-ε model and SST k-ω model.So,the study verifies further that this model can be used in simulation of complex turbulence.
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Key words:
- cylinder flow /
- turbulent model /
- multiscale /
- unsteady /
- supper-transition region
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