Jiaan Liu , Qitai Eri , Bo Kong , Jifeng Huang , Yue Zhou
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引用次数: 0
Abstract
Infrared radiation signature is a key characteristic of target and useful for many inverse analyses. Specially, infrared radiation signature simulation plays an increasingly important role in the field of stealth design of air-vehicle and target identification. To improve the simulation efficiency while ensure accuracy, this study presents two novel implementations based on reverse Monte Carlo method. For the first time, hardware ray tracing cores (RT cores) are leveraged to accelerate infrared calculation considering heterogeneous participating media and walls, which is the key innovation compared to the conventional method that only using CUDA cores for acceleration. The first novel method, termed RT method, determines the intersections using bounding volume hierarchy tree (BVH) that implemented on RT cores throughout computational process. Whereas the other, termed CUDA-RT method, determines the intersections between rays and boundaries based on BVH tree that implemented on RT cores, other intersection calculations are done with the help of the adjacency relationships between the grids and are implemented on CUDA cores. Additionally, an improved ray-intersection method is proposed to address complex meshes. A comparison between the numerical and experimental infrared radiation signatures of a rocket-plume case showed the high accuracy of the novel methods. Moreover, a series of numerical examples indicate that both novel methods significantly improved the computational efficiency. Specifically, the CUDA-RT method has the minimum calculation time, approximately 10 % of the reference method with a small additional GPU memory overhead, facilitating improved stealth design and target identification capabilities.
期刊介绍:
The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review.
The fundamental subjects considered within the scope of the journal are:
* Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow
* Forced, natural or mixed convection in reactive or non-reactive media
* Single or multi–phase fluid flow with or without phase change
* Near–and far–field radiative heat transfer
* Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...)
* Multiscale modelling
The applied research topics include:
* Heat exchangers, heat pipes, cooling processes
* Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries)
* Nano–and micro–technology for energy, space, biosystems and devices
* Heat transport analysis in advanced systems
* Impact of energy–related processes on environment, and emerging energy systems
The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.