IPSJ SIG Technical Report Vol.2013-ARC-207 No.23 Vol.2013-HPC-142 No /12/17 1,a) 1,b) 1,c) 1,d) OpenFOAM OpenFOAM A Bottleneck and Cooperation
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1 1,a) 1,b) 1,c) 1,d) OpenFOAM OpenFOAM A Bottleneck and Cooperation with the Post Processes in Numerical Calculation of Transient Phenomena Taizo Kobayashi 1,a) Yoshiyuki Morie 1,b) Toshiya Takami 1,c) Mutsumi Aoyagi 1,d) Abstract: Research and development of exa-scale computing is advanced energetically. On the other hand, new bottlenecks appear in the post processing of large scale numerical simulations. A numerical simulation of transient phenomena takes more than 90% of time for the post processing. In this paper, the details of the bottlenecks are discussed. Then as a solution for the bottlenecks, cooperation between simulation and the post processing is proposed. An implementation of it for OpenFOAM is also reported. Keywords: Coupled simulation, Cooperated calculation, Transient phenomena, Numrical simulation, Post processing, OpenFOAM 1. CPU [1] 1 Research Institute for Information Technology, Kyushu University a) tkoba@cc.kyushu-u.ac.jp b) morie.yoshiyuki.404@m.kyushu-u.ac.jp c) takami@cc.kyushu-u.ac.jp d) aoyagi@cc.kyushu-u.ac.jp FrontFlow[2], [3] OpenFOAM[4] OpenFOAM 1000 c 2013 Information Processing Society of Japan 1
2 1 Yes No 1 HPC 1 (JHPCN) [5] JHPCN NA09 1 JHPCN 12-DA03 12-MD02 12-MD03 12-MD04 12-MD05 12-MD06 12-NA05 12-NA10 12-NA11 GPGPU 12-NA16 12-MD HPC JHPCN 2 2. [6] [7] c 2013 Information Processing Society of Japan 2
3 (a) (b) 2 (a) (b) 3 (a) (b) 2 Points Cells Faces 2D 158,762 78, ,856 3D 4,048,431 3,924,600 11,896,692 3 Version Fujitsu PRIMERGY CX400 Xeon E GHz OpenFOAM Intel Compiler XE, Intel MPI IMPI InfiniBand 2.1 CFD OpenFOAM LES rhopisofoam Lighthill Howe 2.2 Open- FOAM MPI Super Computer PC Cluster for Post Processing Local PC 1TB 1TB / 300GB Local Lab. Resources Yes No Strage I/O 4 OpenFOAM PC I/O (refeq:1) = / (1) ,720,000 gzip 200 kb 5 TB ( 1 ) : 10 ( a ) : blockmesh ( b ) : decomposepar ( 2 ) : rhopisofoam, 20 ( 3 ) c 2013 Information Processing Society of Japan 3
4 Super Computer PC Cluster Local PC day 6 Super Computer PC Cluster for Post Processing Local PC 1TB 1TB 1GB 300GB Local Lab. Resources 30MB/sec Yes No Strage I/O Network Stream OpenFOAM PC I/O 5 OpenFOAM 20 3 MPI tar ftp I/O 0 1 Super Computer PC Cluster Local PC 2 Next Calc Cycle. ( a ) tar : 2 ( b ) ftp tar : 2 ( c ) tar : 2 ( d ) reconstructpar, 2 ( e ) foamtovtk, 2 ( f ) vorticity, Lighthill, Howe, sample, TB 300GB 100MB day 7 OpenFOAM I/O 3. c 2013 Information Processing Society of Japan 4
5 I/O I/O I/O [8][9] 4 6 I/O tar ftp OpenFOAM OpenFOAM OpenFOAM C++ ( 1 ) ( 2 ) ( 3 ) ρ + (ρv) = 0 (2) t OpenFOAM solve ( ); fvm::ddt(rho) + fvm::div(rhoflux, rho) fvsolution fvschemes fvsolution solvers rho solver preconditioner tolerance PBiCG; DILU; 1e-08; reltol 0.2; fvschemes ddtschemes default divschemes default Euler; none; div(rhoflux,rho) Gauss upwind; OpenFOMA scotch[10] MPI MPI send, Isend, receive, Ireceive, allreduce OpneFOAM OpenCAE [11] OpenFOAM HPC C OpenFOAM 6 LES rhopisofoam MPI reconstructpar OpenFOAM C++ OpenFOAM 8 I/O c 2013 Information Processing Society of Japan 5
6 8 OpenFOAM INstream ONstream I/O stream I/O IFstream, OFstream I/O 8 Nstream Nstream IOstream OpenFOAM C++ ACE[12] 4. JHPCN OpenFOAM C++ OpenFOAM HPC OpenFOAM Fstream Nstream OpenFOAM OpenFOAM OpenFOAM [1] Vol.53 No.8 [2] GUO, Yang, Chisachi KATO, and Yoshinobu YAMADE. Basic Features of the Fluid Dynamics Simulation Software FrontFlow/Blue (2006): [3] FrontFlow: rss21/theme/multi/fluid/fluid softwareinfo.html [4] OpenFOAM: Open Field Operation And Manipulation: The Open Source CFD Toolbox, [5] JHPCN :, [6] T. Iwasaki, T. Kobayashi, K. Takahashi, T. Takami, A. Nishida, M. Aoyagi: Numerical study on the function of tone holes of a recorder like instrument from the viewpoint of the aerodynamic sound theory, ICA2013/POMA, 19, , 2013 [7] M. Miyamoto, Y. Ito, T. Iwasaki, T. Akamura, K. Takahashi, T. Takami, T. Kobayashi, A. Nishida, M. Aoyagi: Numerical study on acoustic oscillations of 2d and 3d flue organ pipe like instruments with compressible les, Acta Acustica united with Acustica, 99, , 2013 [8] c 2013 Information Processing Society of Japan 6
7 HPC-130(20),(SWoPP2011) pp.1-7, [9] HPC-132(4), (Hokke19) pp.1-6, [10] Scoch: Software package and libraries for sequential mesh and hypergraph partitioning, [11] OpenCAE : CAE [12] ACE: The ADAPTIVE Communication Environment schmidt/ace.html c 2013 Information Processing Society of Japan 7
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