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作 者:Zishuo Han Yue Yang 韩子朔;杨越
机构地区:[1]State Key Laboratory for Turbulence and Complex Systems,College of Engineering,Peking University,Beijing 100871,China [2]Key Laboratory of High Energy Density Physics Simulations,Center for Applied Physics and Technology,Peking University,Beijing 100871,China Received January 28,2024
出 处:《Acta Mechanica Sinica》2025年第1期95-105,共11页力学学报(英文版)
基 金:supported by the National Natural Science Foundation of China (Grant Nos.11925201,and 11988102);the National Key R&D Program of China (Grant No.2020YFE0204200);the Xplore Prize.Numerical simulations were carried out on the TH-2A supercomputer in Guangzhou,China.
摘 要:We propose a hybrid quantum-classical method,the quantum-enriched large eddy simulation(QELES),for simulating turbulence.The QELES combines the large-scale motion of the large eddy simulation(LES)and the subgrid motion of the incompressible Schrodinger flow(ISF).The ISF is a possible way to be simulated on a quantum computer,and it generates subgrid scale turbu-lent structures to enrich the LES field.The enriched LES field can be further used in turbulent combustion and multi-phase flows in which the subgrid scale motion plays an important role.As a conceptual study,we perform the simulations of ISF and LES separately on a classical computer to simulate decaying homogeneous isotropic turbulence.Then,the QEI ES velocity is obtained by the time matching and the spectral blending methods.The QEL ES achieves significant improvement in predicting the energy spectrum,probaility density functions of velocity and vorticity components,and velocity structure functions,and reconstructs coherent small-scales vortices in the direct numerical simulation(DNS).On the other hand,the vortices in the QELES are less elongated and tangled than those in the DNS,and the magnitude of the third-order structure function in the QELES is less than that in the DNS,due to the diferent constitutive relations in the viscous flow and ISE.我们提出量子增强大涡模拟用于模拟湍流,作为一种量子-经典混合方法,量子增强大涡模拟结合了大涡模拟的大尺度流动和不可压缩薛定谔流的亚网格流动.不可压缩薛定谔流是一类有望在量子计算机上模拟流体运动的方法,可生成亚网格尺度湍流结构来丰富大涡模拟的流场.量子增强大涡模拟的流场可进一步用于湍流燃烧和多相流的计算,在这些问题中亚网格尺度运动起着重要作用.作为一项概念性的研究,我们在经典计算机上分别实施了大涡模拟和不可压缩薛定谔流模拟,流动设置为衰减均匀各向同性湍流.然后通过时间匹配和谱混合方法得到了量子增强大涡模拟的速度场.相比原大涡模拟,量子增强大涡模拟显著改善了能谱、速度和涡量分量的概率密度函数以及速度结构函数的预测结果,并重建了直接数值模拟中的小尺度拟序涡结构.此外,由于黏性流和不可压缩薛定谔流的本构关系不同,不可压缩薛定谔流中的涡结构比直接数值模拟中的涡结构更短且纠缠度更低,且其中的三阶结构函数幅值小于直接数值模拟中的幅值.
关 键 词:Quantum computing Large-eddy simulation Subgrid motion
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