Sensitivity Analysis of Unsteady Flow Fields and Impact of Measurement Strategy
Joint Authors
Obayashi, Shigeru
Misaka, Takashi
Source
Mathematical Problems in Engineering
Issue
Vol. 2014, Issue 2014 (31 Dec. 2014), pp.1-12, 12 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2014-07-17
Country of Publication
Egypt
No. of Pages
12
Main Subjects
Abstract EN
Difficulty of data assimilation arises from a large difference between the sizes of a state vector to be determined, that is, the number of spatiotemporal mesh points of a discretized numerical model and a measurement vector, that is, the amount of measurement data.
Flow variables on a large number of mesh points are hardly defined by spatiotemporally limited measurements, which poses an underdetermined problem.
In this study we conduct the sensitivity analysis of two- and three-dimensional vortical flow fields within a framework of data assimilation.
The impact of measurement strategy, which is evaluated by the sensitivity of the 4D-Var cost function with respect to measurements, is investigated to effectively determine a flow field by limited measurements.
The assimilation experiment shows that the error defined by the difference between the reference and assimilated flow fields is reduced by using the sensitivity information to locate the limited number of measurement points.
To conduct data assimilation for a long time period, the 4D-Var data assimilation and the sensitivity analysis are repeated with a short assimilation window.
American Psychological Association (APA)
Misaka, Takashi& Obayashi, Shigeru. 2014. Sensitivity Analysis of Unsteady Flow Fields and Impact of Measurement Strategy. Mathematical Problems in Engineering،Vol. 2014, no. 2014, pp.1-12.
https://search.emarefa.net/detail/BIM-465740
Modern Language Association (MLA)
Misaka, Takashi& Obayashi, Shigeru. Sensitivity Analysis of Unsteady Flow Fields and Impact of Measurement Strategy. Mathematical Problems in Engineering No. 2014 (2014), pp.1-12.
https://search.emarefa.net/detail/BIM-465740
American Medical Association (AMA)
Misaka, Takashi& Obayashi, Shigeru. Sensitivity Analysis of Unsteady Flow Fields and Impact of Measurement Strategy. Mathematical Problems in Engineering. 2014. Vol. 2014, no. 2014, pp.1-12.
https://search.emarefa.net/detail/BIM-465740
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-465740