A generalised Fully Lagrangian Approach for gas-droplet flows

This project synthesises mathematical and engineering approaches to the simulation of gas-droplet flows, and includes the development of a novel mathematical formalism. The project focuses on non-trivial generalisation of the version of the Fully Lagrangian Approach (FLA) developed by Osiptsov, also known as the Osiptsov method. This method is recognised as a promising approach to calculating particle/droplet concentrations. However, its current applications are restricted to specific types of flow within a dilute mono-sized admixture. The novel model to be developed in the framework of the project will take into account droplet evaporation, polydispersity of an admixture, and the effect of droplets on the carrier phase (two-way coupling). The corresponding mathematical model will be formulated and implemented in the Computational Fluid Dynamics (CFD) software OpenFOAM, an open-source and widely used CFD software, which will make the project outcomes accessible to specialists interested in sprays. The developed model will be applied to simulate the evolution of droplet distribution in sprays formed by a gasoline or diesel injector. The results of the numerical simulations will be validated against experimental data collected in the Advanced Engineering Centre (AEC), at the University of Brighton (UoB).

本项目整合了气-液滴两相流模拟所需的数学与工程方法，并将构建一套全新的数学形式体系。项目聚焦于对奥西普佐夫（Osiptsov）提出的完全拉格朗日方法（Fully Lagrangian Approach, FLA）进行非平凡推广，该方法亦称奥西普佐夫法，被公认为计算颗粒/液滴浓度的极具前景的技术方案。但当前该方法的应用仅局限于稀相单分散掺混体系内的特定流动类型。本项目拟开发的新型模型将兼顾液滴蒸发、掺混体系的多分散性，以及液滴对连续相的双向耦合作用。相关数学模型将被正式推导并在开源计算流体动力学（Computational Fluid Dynamics, CFD）软件OpenFOAM中实现——该软件是目前应用广泛的主流CFD工具，这将使本项目成果可为所有关注喷雾领域的科研人员所获取。所开发的模型将用于模拟汽油或柴油喷油器所生成喷雾的液滴分布演化过程。数值模拟结果将与布莱顿大学（University of Brighton, UoB）先进工程中心（Advanced Engineering Centre, AEC）所采集的实验数据进行验证对比。