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首页> 外文期刊>Engineering Applications of Computational Fluid Mechanics >Development of Parallel Pseudo-Spectral Solver Using Influence Matrix Method and Application to Boundary Layer Transition
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Development of Parallel Pseudo-Spectral Solver Using Influence Matrix Method and Application to Boundary Layer Transition

机译：影响矩阵法并行伪谱求解器的开发及其在边界层过渡中的应用

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AbstractThe performance of a pseudo-spectral solver, which uses FFT in the streamwise and spanwise directions and Chebyshev polynomials in the wall-normal direction, is improved by implementing MPI domain decomposition for the Chebyshev collocation method using the influence matrix method. The parallel code is validated for LES of plane channel flow at Reτ=590 and 2003, and applied for temporally developing flat plate transition simulations. The domain decomposition using the influence matrix method is implemented to achieve C1 continuity of the velocity across the domain interface. The method provides super linear scalability of solver computational performance. The predictions show kinks in the turbulent statistics on coarser grids, but agree very well with DNS data for finer grids. It is found that accurate turbulent predictions require a minimum of 48 collocation points per subdomain for Re ~ 105, with higher numbers required for Re ~ 106. The flat plate transitional flow simulation is performed for a...
机译：摘要通过使用影响矩阵方法对Chebyshev配置方法进行MPI域分解，可以提高伪谱求解器的性能，该伪谱求解器在流向和跨展向使用FFT，在壁法向使用Chebyshev多项式。并行代码在Reτ= 590和2003时针对平面通道流的LES进行了验证，并应用于临时开发的平板过渡仿真。实施使用影响矩阵方法的域分解，以实现跨域界面的速度C1连续性。该方法提供了求解器计算性能的超线性可伸缩性。这些预测显示了较粗网格的湍流统计中的缺陷，但与较细网格的DNS数据非常吻合。发现准确的湍流预测对于Re〜105至少需要每个子域48个搭配点，而Re〜106则需要更高的数目。

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