采用SST k-ω湍流模型的DDES方法模拟湍流,并引入隐式双时间步的低速预处理技术,数值求解了Navier-Stokes方程,并以此为技术手段,模拟了低速大迎角三角翼绕流及大迎角椭球绕流问题,计算结果展示了由于分离引起的旋涡生成、发展及破碎过程,所得的定量计算数据与实验结果相吻合,表明SST-DDES模型耦合低速预处理技术可以较好地...
SST-DDES气膜冷却流动掺混横流射流拟序结构采用基于SST湍流模型的延迟分离涡模拟(DDES)方法,对吹风比为0.5的平板孤立方孔横流射流进行数值模拟研究,并与实验测量结果进行对比;同时,基于捕捉到的流场大涡拟序结构,分析了射流与主流掺混及损失机理.研究结果表明:气膜冷却流场中存在复杂的大涡拟序结构,这种强三维流动对...
DDES在起落架绕流非定常模拟及气动光学中的应用研究 气动噪声,气动光学等问题,应用DDES开展了详细的数值模拟研究.首先,针对典型起落架大分离问题,本文基于ANSYS CFX计算流体力学软件,分别采用基于两方程剪切应力输运(SST... 董庆利 - 《西北工业大学》 被引量: 0发表: 2019年来源...
Both LES and DDES are conducted in a low-Reynolds number tip leakage flow model. The DDES uses the SST kω model and employs the same grid with the LES, but the turbulence field diverges from the LES result. Referring to the comparison between LES and DDES, a modification of ...
The numerical method for solving Navier-Stokes equations is developed based on the SST k-蠅 turbulence model and the delayed detached-eddy simulation(DDES). Meanwhile, the preconditioning technique coupled with implicit dual time stepping approach is implemented to simulate large separated...
We incorporated the SLA modification into the SST-DDES model and quantified the benefit of it in turbomachinery applications.Guoping XiaZifei YinGorazd MedicProgress in Hybrid RANS-LES Modelling: Papers Contributed to the 7th Symposium on Hybrid RANS-LES Methods, 17–19 September, 2018, Berlin, ...
The hybrid characters of SAS and DDES are discussed inprinciple. Some typical results such as velocity profiles are calculated.Additionally, the effect of the L_(vk) limiter on the performance of SSTSASis discussed. Both SST-SAS and SST-DDES achieve results infavorable agreement with the ...
Application of SST-Based SLA-DDES Formulation to Turbomachinery FlowsIn turbomachinery CFD simulations, Reynolds-Averaged Navier-Stokes (RANS) based approaches tend to under-predict turbulent mixing, which is of particular importance in the endwall region. Detached......
entropy Article An Entropy-Assisted Shielding Function in DDES Formulation for the SST Turbulence Model Ling Zhou 1, Rui Zhao 2,* and Xiao-Pan Shi 2 1 School of Energy and Power Engineering, Huazhong University of Science & Technology, Wuhan 430074, China; lzhou@hust.edu.cn 2 School of ...