Partitioned Parallel Computation Of Wind Flow Around Low-rise Buildings Based On Multi-block Grid

The numerical simulation on the turbulent flow field of wind flow around build-ings is particularly important research area,in particular,the research on large-scale parallel computing is hot issue at home and abroad.The accurate prediction of the wind flow around buildings can meet the requirements for the local design of architectural programming in engineering practice.All kinds of wind flow around buildings have such characteristic as grid system is rather complex and the scale of numerical compu-tation is large.How to improve the efficiency of numerical simulation of wind flow around buildings is a hot research topic in recent years.This paper is supported by the project of natural science foundation of Hunan province(No:14JJ2103),which is about the parallel partitioning simulations of wind field in 3D buildings based on multi block grid and large eddy simulation.Partitioning parallel computing of the wind flow around low buildings were done by open-source code Caffa3d.MBRi and high performance computing cluster of Hunan provincial key laboratory of engineering rheology.The main conclusions of paper are as following:(1)Firstly,open-source code Caffa3d.MBRi was debugged.Secondly,numerical simulation of multi-block grid system were established based on open-source code Caffa3d.MBRi.Thirdly,parallel computing were carried out.Finally,the reliability of the open source code Caffa3d.MBRi was verified to compare the numerical simulation results with the test results.(2)A simulation platform of wind flow around low buildings system was set up and numerical simulation of many conditions were carried out under the linux system based on open-source code Caffa3d.MBRi and DELL cluster of CSUFT,wind flow around low buildings of single low-rise buildings of different slope roof were re-searched(Including the single slope 0 °,10 °,30°,45 °,60 °,double slope 10 °,30 °,45 °,60 °).The study of the results showed that wind pressure of building roof is rela-tively small as double-slope roof structure around 30 degrees or single-slope roof struc-ture between 10 to 30 degrees.(3)This paper carried out two or more buildings based on open-source code Caffa3d.MBRi and DELL cluster of CSUFT.The study of the results show that upper buildings had a greater influence on the wind pressure as two or more buildings that were arranged tandem or each other had less influence as two or more buildings that were arranged paralleled by analyzing the results of numerical simulation of flow field and the wind pressure of roof surface.(4)Large-scale wind field partition parallel numerical simulation of low-rise buildings were carried by using numerical simulation platform of the wind field that had been set up and based on the custom partition method.The study found that using the appropriate number of cores and balancing computing tasks of each nuclear could give full play to peak of the cluster performance and improved the efficiency of parallel computing.Major innovations of this paper were that numerical simulation platform of wind field were established based on Multi-grid system and Caffa3d.MBRi package;Large-scale partition parallel computing were carried out by using wind field numerical sim-ulation platform,and then peak performance of cluster was researched.