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首页> 外文会议>The 2001 ASME International Mechanical Engineering Congress and Exposition, 2001, Nov 11-16, 2001, New York, New York >A NEW LES POOL FIRE SIMULATION TOOL
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A NEW LES POOL FIRE SIMULATION TOOL

机译：新型LES POOL火灾模拟工具

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In a large-scale pool fire simulation, the processes that must be modeled are complex and coupled. The flow is often highly turbulent, dynamic vortical structures are present, the chemical reactions involve several thousand elementary steps and hundreds of species/intermediates, and radiation, the dominant mode of heat transfer, is strongly affected by the presence of soot. The range of length and time scales associated with all these processes cannot be simulated on even the most powerful supercomputers available today. Our approach to making this intractable problem tractable has been twofold: one, to improve the models used at all levels in the simulation (i.e., transport models and subgrid scale models) and two, to parallelize the simulation tool to run on massively parallel machines. We have employed Large Eddy Simulation (LES) to model the fluid dynamics and the convection-diffusion scalar transport. LES successfully captures the transient nature of the coherent vortical structures present in a pool fire. We have integrated these improved models into a computational framework that provides support for parallelization. Preliminary validation results show the capability of the fire simulation tool to capture the puffing nature of pool fires. In addition, scalability studies of the simulation tool reveal close to linear scalability up to 500 processors.
机译：在大型池火仿真中，必须建模的过程是复杂且耦合的。流动通常是高度湍流的，存在动态的涡旋结构，化学反应涉及数千个基本步骤和数百个物种/中间体，并且烟尘的存在对辐射（传热的主要方式）产生了强烈影响。与所有这些过程相关的长度和时间范围的范围，即使在当今最强大的超级计算机上也无法模拟。我们使这个棘手的问题易于解决的方法有两个方面：一是改进仿真中所有级别使用的模型（即运输模型和子网格规模模型），二是使仿真工具并行化以在大型并行机上运行。我们采用了大涡模拟（LES）来模拟流体动力学和对流扩散标量传输。 LES成功地捕获了池火中存在的相干涡旋结构的瞬态性质。我们已经将这些改进的模型集成到一个计算框架中，该框架为并行化提供支持。初步验证结果表明，火灾模拟工具能够捕获水池火灾的扑腾性质。此外，对仿真工具的可扩展性研究显示，多达500个处理器的线性可扩展性接近。

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