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Development of a Trip Line Sub-Region Approach for Flow Transition Modeling

机译：流动转换建模的跳闸线亚区域方法的开发

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A new numerical modeling approach using the Spalart-Allmaras trip line turbulence model has been investigated. This concept utilizes a novel overset grid sub-region to model prescribed boundary layer flow transition where a grid line is placed right along the trip line. This approach not only improves simulation accuracy as the streamwise grid spacing can be refined, but also greatly reduces the amount of trip line specification inputs commonly required on fragmented grid segments in a production Computational Fluid Dynamics (CFD) code like OVERFLOW. In the study, the numerical results obtained from the trip-line sub-region approach are shown to be consistent with a single zone model in terms of the transition location, the strength of trip function and convection, as well as eddy viscosity field. The trip-line transition results are also compared with the Langtry-Menter transition solution to illustrate a similar correlation in the laminar and turbulent regions for engineering applications in fixed transition and natural-transition simulations. The trip-line sub-region model is also applied to the Sickle wing to demonstrate the capability of modeling a highly curved transition boundary. The numerical results show that the jump in skin friction due to boundary layer flow tripping is well captured along the prescribed trip line in the sub-region approach. Multiple overset sub-regions may be used, but proper treatment is required to avoid interpolation errors as discussed in the study.
机译：研究了使用SPALART-ALLMARAS跳闸线湍流模型的新的数值建模方法。该概念利用一个新的推销网格子区域来模拟规定边界层流动转换，其中沿跳闸线右侧放置网格线。这种方法不仅可以提高模拟精度，因为可以精制流动网格间距，而且大大减少了在生产计算流体动力学（CFD）代码中的分段网格段上通常需要的跳闸线规范输入的量。在该研究中，从跳闸线亚区方法获得的数值结果被示出与过渡位置，跳闸功能和对流的强度以及涡粘度场的单个区域模型一致。还与Langtry-Center转换解决方案进行了比较的跳闸线转换结果，以说明在固定过渡和自然转换模拟中的工程应用中的层流和湍流区域中的相似相关性。跳闸线亚区域模型也应用于镰刀翼，以证明建模高弯曲过渡边界的能力。数值结果表明，由于边界层流动跳闸引起的皮肤摩擦跳跃沿着子区域方法中的规定跳闸线很好地捕获。可以使用多个推档子区域，但是需要适当的处理来避免如研究中讨论的内插误差。

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