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首页> 外文期刊>Aerospace science and technology >Capturing transition with flow-structure-adaptive KDO RANS model
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Capturing transition with flow-structure-adaptive KDO RANS model

机译：使用自适应流结构的KDO RANS模型捕获过渡

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By extending Bradshaw's assumption from the free shear flows to the wall-bounded flows, the Kinetic energy Dependent Only turbulence model (KDO) established a new Reynolds stress constitution. The Bradshaw function (tau(12)/k) and the coefficient of the dissipation term are the only two empirical coefficients. They were both calibrated with the turbulent Reynolds number, Re-k = rho k(1/2)d/mu, which depends on the wall distance. Once the wall distance is replaced with "flow-structure-adaptive" parameters, such as the eddy viscosity ratio, r = mu(t)/mu, the model could naturally capture various transition phenomena. The improved KDO model is assessed by some test cases including the classic bypass transition of T3A and T3B boundary layers, the natural transition of the T3A boundary layer, and the separation bubble induced transition of Aero-A airfoil. The assessments show that the improved KDO model is not capable of capturing the precise process of the laminar-turbulent flow transition, but the model can accurately predict the transition onset locations. The model does not include specific transition mechanisms; however, for high Reynolds numbers and complex flows with different types of transition, the predictions are reliable. (C) 2018 Elsevier Masson SAS. All rights reserved.
机译：通过将Bradshaw的假设从自由剪切流扩展到边界流，动能依赖湍流模型（KDO）建立了新的雷诺应力构造。布拉德肖函数（tau（12）/ k）和耗散项的系数是仅有的两个经验系数。它们都用湍动的雷诺数校准，Re-k = rh k（1/2）d / mu，取决于壁距。一旦将壁距替换为“流动结构自适应”参数，例如涡流粘度比，r = mu（t）/ mu，该模型就可以自然地捕获各种过渡现象。通过一些测试案例对改进的KDO模型进行了评估，其中包括T3A和T3B边界层的经典旁路过渡，T3A边界层的自然过渡以及分离气泡引起的Aero-A机翼的过渡。评估表明，改进的KDO模型无法捕获层流湍流过渡的精确过程，但是该模型可以准确地预测过渡开始位置。该模型不包括特定的过渡机制。但是，对于高雷诺数和具有不同过渡类型的复杂流动，预测是可靠的。 （C）2018 Elsevier Masson SAS。版权所有。

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