The effectiveness of a fuelbreak, created in a homogeneous grassland on a flat terrain, was studied numerically. The analysis relies on 3D numerical simulations that were performed using a detailed physical-fire-model (FIRESTAR3D) based on a multiphase formulation. To avoid border effects, calculations were carried out by imposing periodic boundary conditions along the two lateral sides of the computational domain, reproducing that way a quasi-infinitely long fire front. A total of 72 simulations were carried out for various wind speeds, fuel heights, and fuelbreak widths, which allowed to cover a large spectrum of fire behaviour, ranging from plume-dominated fires to wind-driven fires. The results were classified in three main categories: 1- “Propagation” if fire crossed the fuelbreak with a continuous fire front, 2- “Overshooting” and “Marginal” if fire marginally crosses the fuelbreak with the formation of burning pockets, and 3- “No propagation” if fire does not cross at all the fuelbreak. The ratio of fuelbreak width to fuel height, marking the “Propagation”/“No propagation” transition, was found to be scaled with Byram's convection number N_c as 75.07 × N_c^−0.46. The numerical results were also compared to an operational wildfire engineering tool (DIMZAL) dedicated to fuelbreaks dimensioning.

在平坦地形上的均质草原上创建的燃料中断的有效性进行了数值研究。该分析依赖于使用基于多相公式的详细物理火灾模型 (FIRESTAR3D) 执行的 3D 数值模拟。为避免边界效应，通过沿计算域的两侧施加周期性边界条件来进行计算，以这种方式再现准无限长的火锋。总共针对不同风速、燃料高度和燃料屏障宽度进行了 72 次模拟，这些模拟可以涵盖从羽流主导的火灾到风力驱动的火灾的大范围火灾行为。结果分为三个主要类别： 1-“传播”，如果火以连续火锋穿过燃料隔离带，2-“过冲”和“边缘”，如果火在形成燃烧袋的情况下略微穿过燃料隔板，并且 3-如果火根本不穿过燃料隔板，则为“无传播”。燃料断裂宽度与燃料高度的比率，标志着“传播”/“无传播”过渡，被发现与拜拉姆的对流数成比例N _c为 75.07 ×  N _c ^-0.46。数值结果还与专用于燃料中断尺寸的可操作野火工程工具 (DIMZAL) 进行了比较。