A structured Reynolds-averaged Navier–Stokes solver is directly coupled to a linear stability theory (LST) solver to include the effect of laminar–turbulent transition in the flow simulations. The flowfield variables of the flow solver are used to both find streamlines along which transition can be predicted and to provide the LST code with the required boundary-layer profiles. Instabilities included in the analysis are of the Tollmien–Schlichting and crossflow nature relevant to high-Reynolds-number flows in low turbulence environments. The coupling is fully automated and can therefore be used efficiently in the analysis and design of geometries with external flows. The Technical University of Braunschweig’s sickle wing with spanwise-varying crossflow and the natural laminar flow version of the Common Research Model are simulated under various conditions. Applications to these relevant three-dimensional test cases showcase the capability of the method to model the real flow physics. Advantages and challenges of the approach with regard to future design endeavors are discussed.

结构化的雷诺平均Navier–Stokes求解器直接与线性稳定性理论（LST）求解器耦合，以在流动模拟中包括层流湍流转换的影响。流量求解器的流场变量不仅用于查找可以预测过渡的流线，还可以为LST代码提供所需的边界层轮廓。分析中包括的不稳定性是与Tollmien-Schlichting和横流性质有关的，这与低湍流环境中的高雷诺数流有关。耦合是完全自动化的，因此可以有效地用于具有外部流的几何形状的分析和设计中。在不同条件下，模拟了不伦瑞克技术大学的跨翼横流变化的镰刀形机翼和通用研究模型的自然层流版本。这些相关的三维测试用例的应用展示了该方法对真实流动物理场建模的能力。讨论了该方法在未来设计方面的优势和挑战。