2020 Fiscal Year Research-status Report
Stochastic Model Optimization for Improving the Accuracy and Rapidity of Urban Airflow CFD Simulations
| Project/Area Number |
20K14889
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| Research Institution | Niigata Institute of Technology |
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Principal Investigator |
シルザディ モハンマッドレザ 新潟工科大学, 工学部, 特任研究員 (40868733)
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| Project Period (FY) |
2020-04-01 – 2022-03-31
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| Keywords | Pedestrian / Shape optimization / CFD / Wind Environment |
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| Outline of Annual Research Achievements |
A multi-fidelity shape optimization framework was proposed for the pedestrian-level wind environment (PLWE). In the proposed framework, low-fidelity computational fluid dynamics (CFD) models based on steady Reynolds-averaged Navier-Stokes equations (RANS) models and high-fidelity CFD models based on large-eddy simulation (LES) are efficiently integrated into the optimization process to improve its reliability while maintaining its computational speed in an affordable range for practical engineering applications.
The optimization solver is coupled with an approximation model generated by low-fidelity CFD samples obtained using a design of experiments (DOE) technique. The optimal candidates are then evaluated according to the degree of improvement of the objective function compared to the reference case.
The applicability of the proposed method was investigated in terms of minimizing the high-wind-speed area, as the optimization objective, around a high-rise building considering (a) uniform urban blocks and (b) real urban blocks with different frequency distributions of wind directions associated with two different local wind climates.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
A significant reduction in the critical strong-wind area around the target building was realized using the proposed optimization framework. Furthermore, the application of the proposed multi-fidelity optimization framework highlighted the importance of architectural design based on the local wind climate.
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| Strategy for Future Research Activity |
For the research in this year, the modification options were limited to a generic simple shape for the target building. For practical architectural applications, a combination of other geometry modification options, such as podium or lift-up designs, should be considered. Furthermore, only the geometry of the target building was modified in this study; geometry modification of multiple buildings can also be considered in the optimization procedure. Hence, future studies will focus on the applicability of the proposed optimization framework to more complicated building configurations.
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Research Products
(8 results)
