IMECH-IR  > 非线性力学国家重点实验室
Error reduction for time-resolved PIV data based on Navier-Stokes equations
Wang HP(王洪平); Gao Q; Wang SZ(王士召); Li YH; Wang ZY; Wang JJ
Source PublicationEXPERIMENTS IN FLUIDS
2018-10-01
Volume59Issue:10Pages:149
ISSN0723-4864
AbstractThe post-processing of the measured velocity in particle image velocimetry (PIV) is a critical step in reducing error and predicting missing information of the flow field. In this work, time-resolved PIV data are incorporated with the incompressible Navier-Stokes (N-S) equations to reduce the measurement error and improve the accuracy. A pressure correction scheme (PCS) based on the projection method is adopted to solve the N-S equations, and an optimization algorithm is introduced to balance the fidelity between the PIV data and the numerical solutions. The PCS for PIV data, called PIV-PCS, cannot only reduce the errors in the velocity divergence and the curl of the pressure gradient but also ensure that the flow field satisfies the dynamic constraints imposed by the momentum equation. An important weight coefficient s that balances the level of the velocity modification with the residual of the governing equation is defined and numerically assessed. A method for optimizing the value of s is provided. The new approach is evaluated by two time-resolved PIV experiments: one on the 2D wake flow of a circular cylinder at low Reynolds number and one on tomographic PIV for the 3D wake flow of a hemisphere at high Reynolds number. All the numerical assessments and experimental applications are compared with the divergence-free smoothing (DFS) method. The results indicate that the presented PIV-PCS method is superior to the DFS method in terms of reducing the measurement error and recovering the real physical flow structures.
DOI10.1007/s00348-018-2605-1
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000444457300001
WOS KeywordLAMINAR BOUNDARY-LAYER ; HAIRPIN VORTICES ; FLOW ; VELOCIMETRY
WOS Research AreaEngineering, Mechanical ; Mechanics
WOS SubjectEngineering ; Mechanics
Funding OrganizationNational Natural Science Foundation of China [11702302, 11472030, 11572331] ; Fundamental Research Funds for Central Universities [YWF-16-JCTD-A-05] ; [XDB22040104]
Classification二类
Ranking1
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/77935
Collection非线性力学国家重点实验室
Affiliation1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing, Peoples R China
2.Zhejiang Univ, Sch Aeronaut & Astronaut, Hangzhou, Zhejiang, Peoples R China
3.Beihang Univ, Minist Educ, Key Lab Fluid Mech, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Wang HP,Gao Q,Wang SZ,et al. Error reduction for time-resolved PIV data based on Navier-Stokes equations[J]. EXPERIMENTS IN FLUIDS,2018,59(10):149.
APA 王洪平,Gao Q,王士召,Li YH,Wang ZY,&Wang JJ.(2018).Error reduction for time-resolved PIV data based on Navier-Stokes equations.EXPERIMENTS IN FLUIDS,59(10),149.
MLA 王洪平,et al."Error reduction for time-resolved PIV data based on Navier-Stokes equations".EXPERIMENTS IN FLUIDS 59.10(2018):149.
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