Dynamics of fire whirl in open + closed spaces: fundamental physics + modelling

火旋风是一种强烈的、潜在的破坏性现象，在适当的条件下，它可以导致龙卷风状结构的形成，也就是说，从火中释放的热量改变了周围空气的动力学，导致形成旋转的空气柱，这反过来又增加了火焰的高度和火焰的燃烧速度。尽管火旋风具有毁灭性的力量，但人们对其内部结构的了解相对较少。在本研究中，我们的目标是通过结合（小规模）物理测量和使用大涡模拟（LES）的高保真数值模拟来解决这个问题。该项目旨在(i)使用开源平台开发和验证LES流求解器，以模拟这类流；（ii）确定形成火旋风所需的各种原因的组合；（iii）建立一个架构，以预测在开放及封闭空间内不同拓扑及环境条件下浮游生物的形成和移动。

A fire whirl is an intense and potentially devastating phenomena which under the correct conditions can result in the formation of a tornado-like structure, i.e., the heat released from a fire changes the dynamics of the surrounding air causing a rotating column of air to form, which in turn increases the flame height and burning rate of the fire. Despite the devastating power of fire whirls, relatively little is understood about their internal structure. In this research, we aim to address this though a combination of (small-scale) physical measurements and high fidelity numerical modelling using Large-eddy simulation (LES). The project aims at (i) using open source platforms to develop and validate an LES flow solvers for modelling this class of flow; (ii) identifying the combinations of causes that are required to form a fire whirl; (iii) establishing a framework for predicting the formation and movements of FWs at different topological and ambient conditions in open and closed spaces.