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首页> 外文期刊>Journal of Aerospace Sciences and Technologies >DEVELOPMENT OF 3-D COMPUTER CODE TO STUDY AUTOIGNITION IN A TURBULENT MEDIUM
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DEVELOPMENT OF 3-D COMPUTER CODE TO STUDY AUTOIGNITION IN A TURBULENT MEDIUM

机译：用于研究湍流介质中自律性的3-D计算机代码的开发

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摘要

In this paper, the development and validation of 3-dimensional computer code to analyze autoignition in a non-premixed medium under isotropic and homogeneous turbulence is presented. During autoignition the density changes are considerable and hence the constant density assumption cannot be made. To include the effects of density fluctuations caused due to spatial inhomogeneities in temperature and species, a pressure based method is developed herein, which is a spectral implementation of the sequential steps followed in the predictor-corrector type of algorithms. The velocity and pressure field are solved in spectral space while the scalars are solved in physical space. The combustion is assumed to take place through a single-step irreversible reaction. Simulations are first validated for nonreacting turbulence without any scalars. Next, the decay of scalar variance has been studied which showed a power law decay as observed by the earlier researchers. Then the program is extended to analyze the reacting flow problems. The code has been parallelized using MPI calls to run it efficiently on IBM-SP machines. The details of the governing equations, solution methodology and comparison of present results with previous data are presented.
机译：本文提出了三维计算机代码的开发和验证，以分析在各向同性和均匀湍流下非预混合介质中的自燃。在自动点火期间，密度变化很大，因此无法做出恒定的密度假设。为了包括由于温度和物质的空间不均匀性引起的密度波动的影响，本文开发了基于压力的方法，该方法是在预测器-校正器类型的算法中遵循的连续步骤的频谱实现。速度和压力场在光谱空间中求解，而标量在物理空间中求解。假定燃烧通过单步不可逆反应进行。首先对没有任何标量的非反应湍流进行仿真验证。接下来，对标量方差的衰减进行了研究，结果显示了早期研究人员观察到的幂律衰减。然后扩展程序以分析反应流问题。使用MPI调用对代码进行了并行处理，以在IBM-SP机器上有效地运行它。介绍了控制方程的详细信息，求解方法以及当前结果与先前数据的比较。

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