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This paper investigates the pullback asymptotic behaviors for the non-autonomous micropolar fluid flows in 2D bounded domains. We use the energy method, combining with some important properties of the generated processes, to prove the existence of pullback exponential attractors and global pullback attractors and show that they both with finite fractal dimension. Further, we give the relationship between global pullback attractors and pullback exponential attractors. 相似文献
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以一台已有对旋风机为原型进行三维数值计算,通过计算结果分析风机内部流动。在对数值结果和速度三角形分析的基础上,通过调整叶片的叶型弯角和扭转角改变叶片气流攻角及其内部流动进行了叶片的三维造型优化。对优化结果计算分析表明优化后对旋风机的内部流场更为合理,通道涡得到了抑制。计算结果和试验数据表明优化后对旋风机比优化前最大流量提高1 m~3/s、最大全压升提高1300 Pa,效率和功率在大流量下有所改善。 相似文献
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