采用GPU加速复杂结构角系数计算的方法研究

发布时间：2018-04-01 22:11

本文选题：角系数　切入点：GPU　出处：《工程热物理学报》2017年06期

【摘要】：采用离散传递法计算目标的红外辐射特征首先要计算角系数,对于复杂目标,角系数计算会耗费大量时间。针对角系数计算中遮挡判断问题,提出了一种不需要求解微元面中心点连线与遮挡面交点的矢量法。开发了基于矢量法的GPU并行程序,并使用一个有理论解的模型验证了程序的正确性,最后针对航空发动机排气系统复杂模型,在一台配置有448个核心的GPU处理器和主频为3.4GHz CPU处理器的工作站上,评估了基于矢量法的GPU程序相对单核CPU程序的加速效果。结果表明;在微元面数量为13670时,矢量法可获得约73倍的加速比,是采用线面求交法获得的加速比的1.4倍。使用离散传递法计算航空发动机排气系统的红外辐射特征时,仅将角系数模块使用GPU并行计算,可减少45%的计算时间。
[Abstract]:In order to calculate the infrared radiation characteristics of the target by discrete transfer method, the angle coefficient is first calculated. For complex targets, the calculation of the angle coefficient will take a lot of time.In order to solve the occlusion judgment problem in the calculation of angle coefficient, a vector method is proposed, which does not need to solve the line of center point and the intersection point of shading surface.The GPU parallel program based on vector method is developed, and a theoretical model is used to verify the correctness of the program. Finally, the complex model of aero-engine exhaust system is used to verify the correctness of the program.On a 448 core GPU processor and a workstation with a main frequency of 3.4GHz CPU processor, the acceleration effect of a GPU program based on vector method compared with a single core CPU program is evaluated.The results show that when the number of differential surfaces is 13670, the speedup of vector method is about 73 times, which is 1.4 times of that obtained by line and surface intersection method.When the infrared radiation characteristics of aero-engine exhaust system are calculated by discrete transfer method, the calculation time can be reduced by 45% by using GPU in the angular coefficient module.
【作者单位】：南京航空航天大学能源与动力学院;
【基金】：航空科学基金(No.20132752039)
【分类号】：O434.31;TP338.6

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