Flow Characteristics and Turbulence Simulation for an Aircraft Cabin Environment

摘要

In the paper it is theoretically proven that the topological structure of the airflow field in an airliner cabin is absolutely unstable. These are typical flow characteristics in the cabin. This also explains why in previous numerical simulations and experiments, discrepancies often arose in flow-direction results. Next, we used the fine LES with 22 million grid cells to reproduce the primary flow instability phenomenon in a symmetric cabin. However, the unsteady RANS (URANS) method with conventional turbulence models, such as the RNG k-￡ turbulence mode, the Realizable k-e turbulence model and the V2f turbulence model, cannot effectively simulate the instability of flow field in a symmetric cabin. So we developed an anisotropic model (BV2fAM) based on the idea of the V2f model. Three million grid cells are used in the BV2fAM simulation. The flow instability phenomenon is successfully reproduced in the numerical simulation of BV2fAM.