Computational fluid dynamics (CFD) technique is well-known for its powerful capability of modelling the cross-ventilation. CFD is broadly coupled with energy simulation programmes, such as EnergyPlus, to expand its application in building energy calculation. During the coupling process, iterative calculation is required to improve the accuracy of the coupling method, which means the scale of the model should be designed with extra care so that the simulation can be practical in terms of computational cost. A coarse-resolution mesh (here denoted as CFD_c) cannot properly represent the required local environment to study the underlying physics. However, a fine-resolution CFD microclimate model (here denoted as CFD_f), which includes both indoor and outdoor spaces, always requires a large number of cells to capture the complexities of environment; this makes the coupling procedure a challenging problem. This study aims to propose an innovative, high-resolution and computationally cost-effective CFD_f-CFD_c model to overcome this gap. The full-scale CFD_f works in an off-line manner at the preliminary simulation stage and generates detailed flow parameters at the interfaces for CFD_c. At the dynamic stage of the simulation, CFD_c participates in the coupling procedure with the other tools, for example, building energy simulation (BES) tool (e.g. EnergyPlus). The coupling of CFD_f-CFD_c-BES is about 200 times faster than an ordinary coupled CFD_f-BES method with a significantly quicker and more stable achievement in the convergence.

计算流体动力学（CFD）技术以其对交叉换气建模的强大功能而闻名。CFD广泛地与能源模拟程序（例如EnergyPlus）结合使用，以扩展其在建筑能源计算中的应用。在耦合过程中，需要进行迭代计算以提高耦合方法的准确性，这意味着应格外小心地设计模型的比例，以便使仿真在计算成本方面切实可行。粗糙分辨率的网格（在此表示为CFD _c）不能正确表示研究基础物理所需的局部环境。但是，高分辨率CFD微气候模型（此处称为CFD _f）（包括室内和室外空间）总是需要大量的单元来捕获环境的复杂性；这使得耦合过程成为难题。这项研究旨在提出一种创新的，高分辨率且具有计算成本效益的CFD _f -CFD _c模型，以克服这一差距。满量程CFD _f在初步模拟阶段以离线方式工作，并在CFD _c的界面上生成详细的流量参数。在模拟的动态阶段，CFD _c参与了与其他工具（例如建筑能耗模拟（BES）工具（例如，EnergyPlus））的耦合过程。CFD _f -CFD _c的耦合-BES比普通的CFD _f -BES耦合方法快200倍，并且收敛速度更快，更稳定。