Large-scale LES analysis for aerodynamics of a group of racing bicycles by lattice Boltzmann method
We implement and perform large-scale LES analysis for running groups of cyclists. The mesh-refined lattice Boltzmann method (LBM) and coherent-structure Smagorinsky model (CSM) are adopted for the simulations to achieve a high performance computing on the recent GPU supercomputer. In the simulation...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | Japanese |
| Published: |
The Japan Society of Mechanical Engineers
2019-02-01
|
| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/85/870/85_18-00441/_pdf/-char/en |
| _version_ | 1798015107231383552 |
|---|---|
| author | Yuta HASEGAWA Takayuki AOKI Hiromichi KOBAYASHI Keita SHIRASAKI |
| author_facet | Yuta HASEGAWA Takayuki AOKI Hiromichi KOBAYASHI Keita SHIRASAKI |
| author_sort | Yuta HASEGAWA |
| collection | DOAJ |
| description | We implement and perform large-scale LES analysis for running groups of cyclists. The mesh-refined lattice Boltzmann method (LBM) and coherent-structure Smagorinsky model (CSM) are adopted for the simulations to achieve a high performance computing on the recent GPU supercomputer. In the simulation with 16 cyclists, the mesh spacing around cyclists is 4 mm, and the total number of the mesh is up to 8.1×108 and the number of GPUs utilized is up to 64. Each calculation took 4 or 5 days for the 8～11 seconds of physical duration. The flow around 16 cyclists in various arrangement is calculated, and the results show that the in-line arrangement is more effective than the rhomboid arrangement in the viewpoint of the total aerodynamic drag of the group; however, a specific person in rhomboid arrangement can obtain larger drag reduction and save the endurance. Results on two groups also suggest that the frontal group in rhomboid arrangement will be exploited as the wind protection of the backward groups. |
| first_indexed | 2024-04-11T15:29:09Z |
| format | Article |
| id | doaj.art-6f1153e0a22449268ba192387d746af3 |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-11T15:29:09Z |
| publishDate | 2019-02-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-6f1153e0a22449268ba192387d746af32022-12-22T04:16:11ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612019-02-018587018-0044118-0044110.1299/transjsme.18-00441transjsmeLarge-scale LES analysis for aerodynamics of a group of racing bicycles by lattice Boltzmann methodYuta HASEGAWA0Takayuki AOKI1Hiromichi KOBAYASHI2Keita SHIRASAKI3Department of Mechanical Engineering, Tokyo Institute of TechnologyGlobal Scientific Information and Computing Center, Tokyo Institute of TechnologyDepartment of Physics & Research and Education Center for Natural Sciences, Keio UniversityHigh-Performance Center. Japan Cycling FederationWe implement and perform large-scale LES analysis for running groups of cyclists. The mesh-refined lattice Boltzmann method (LBM) and coherent-structure Smagorinsky model (CSM) are adopted for the simulations to achieve a high performance computing on the recent GPU supercomputer. In the simulation with 16 cyclists, the mesh spacing around cyclists is 4 mm, and the total number of the mesh is up to 8.1×108 and the number of GPUs utilized is up to 64. Each calculation took 4 or 5 days for the 8～11 seconds of physical duration. The flow around 16 cyclists in various arrangement is calculated, and the results show that the in-line arrangement is more effective than the rhomboid arrangement in the viewpoint of the total aerodynamic drag of the group; however, a specific person in rhomboid arrangement can obtain larger drag reduction and save the endurance. Results on two groups also suggest that the frontal group in rhomboid arrangement will be exploited as the wind protection of the backward groups.https://www.jstage.jst.go.jp/article/transjsme/85/870/85_18-00441/_pdf/-char/enaerodynamicsracing bicycleslattice boltzmann methodmesh refinementles |
| spellingShingle | Yuta HASEGAWA Takayuki AOKI Hiromichi KOBAYASHI Keita SHIRASAKI Large-scale LES analysis for aerodynamics of a group of racing bicycles by lattice Boltzmann method Nihon Kikai Gakkai ronbunshu aerodynamics racing bicycles lattice boltzmann method mesh refinement les |
| title | Large-scale LES analysis for aerodynamics of a group of racing bicycles by lattice Boltzmann method |
| title_full | Large-scale LES analysis for aerodynamics of a group of racing bicycles by lattice Boltzmann method |
| title_fullStr | Large-scale LES analysis for aerodynamics of a group of racing bicycles by lattice Boltzmann method |
| title_full_unstemmed | Large-scale LES analysis for aerodynamics of a group of racing bicycles by lattice Boltzmann method |
| title_short | Large-scale LES analysis for aerodynamics of a group of racing bicycles by lattice Boltzmann method |
| title_sort | large scale les analysis for aerodynamics of a group of racing bicycles by lattice boltzmann method |
| topic | aerodynamics racing bicycles lattice boltzmann method mesh refinement les |
| url | https://www.jstage.jst.go.jp/article/transjsme/85/870/85_18-00441/_pdf/-char/en |
| work_keys_str_mv | AT yutahasegawa largescalelesanalysisforaerodynamicsofagroupofracingbicyclesbylatticeboltzmannmethod AT takayukiaoki largescalelesanalysisforaerodynamicsofagroupofracingbicyclesbylatticeboltzmannmethod AT hiromichikobayashi largescalelesanalysisforaerodynamicsofagroupofracingbicyclesbylatticeboltzmannmethod AT keitashirasaki largescalelesanalysisforaerodynamicsofagroupofracingbicyclesbylatticeboltzmannmethod |