A system model for assessing scalar dissipation measurement accuracy in turbulent flows
Abstract
In this paper, a system model is developed to investigate independent and coupled effects of resolution, noise and data processing algorithms on the accuracy of the scalar gradient and dissipation measurements in turbulent flows. Finite resolution effects are simulated by spectral filtering, noise is modelled as an additive source in the model spectrum and differencing stencils are analysed as digital filters. In the current study, the effective resolution is proposed to be a proper criterion for quantifying the resolution requirement for scalar gradient and dissipation measurement. Both effective resolution and noise-induced apparent dissipation are mainly determined by the system transfer function. The finite resolution results, based upon a model scalar energy spectrum, are shown to agree with non-reacting experimental data. The coupled resolution-noise results show three regions in the mean scalar dissipation rate measurement: noise-dominated region, noise-resolution correlated region and resolution-dominated region. Different noise levels lead to different resolution error curves for the measured mean scalar dissipation rate. Experimental procedures and guidelines to improve the scalar gradient and dissipation experiments are proposed, based on these model study results. Finally, the proposed system approach can also be applied to other derived quantities involving complex transfer functions.
- Authors:
-
- Sandia National Lab. (SNL-CA), Livermore, CA (United States). Combustion Research Facility
- Univ. of Texas, Austin, TX (United States). Dept. of Aerospace Engineering and Engineering Mechanics
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-CA), Livermore, CA (United States); Univ. of Texas, Austin, TX (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1427003
- Report Number(s):
- SAND-2007-0473J
Journal ID: ISSN 0957-0233; 524026
- Grant/Contract Number:
- AC04-94AL85000; CTS-9977481
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Measurement Science and Technology
- Additional Journal Information:
- Journal Volume: 18; Journal Issue: 5; Journal ID: ISSN 0957-0233
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING
Citation Formats
Wang, G-H, Clemens, N. T., Barlow, R. S., and Varghese, P. L. A system model for assessing scalar dissipation measurement accuracy in turbulent flows. United States: N. p., 2007.
Web. doi:10.1088/0957-0233/18/5/015.
Wang, G-H, Clemens, N. T., Barlow, R. S., & Varghese, P. L. A system model for assessing scalar dissipation measurement accuracy in turbulent flows. United States. https://doi.org/10.1088/0957-0233/18/5/015
Wang, G-H, Clemens, N. T., Barlow, R. S., and Varghese, P. L. Tue .
"A system model for assessing scalar dissipation measurement accuracy in turbulent flows". United States. https://doi.org/10.1088/0957-0233/18/5/015. https://www.osti.gov/servlets/purl/1427003.
@article{osti_1427003,
title = {A system model for assessing scalar dissipation measurement accuracy in turbulent flows},
author = {Wang, G-H and Clemens, N. T. and Barlow, R. S. and Varghese, P. L.},
abstractNote = {In this paper, a system model is developed to investigate independent and coupled effects of resolution, noise and data processing algorithms on the accuracy of the scalar gradient and dissipation measurements in turbulent flows. Finite resolution effects are simulated by spectral filtering, noise is modelled as an additive source in the model spectrum and differencing stencils are analysed as digital filters. In the current study, the effective resolution is proposed to be a proper criterion for quantifying the resolution requirement for scalar gradient and dissipation measurement. Both effective resolution and noise-induced apparent dissipation are mainly determined by the system transfer function. The finite resolution results, based upon a model scalar energy spectrum, are shown to agree with non-reacting experimental data. The coupled resolution-noise results show three regions in the mean scalar dissipation rate measurement: noise-dominated region, noise-resolution correlated region and resolution-dominated region. Different noise levels lead to different resolution error curves for the measured mean scalar dissipation rate. Experimental procedures and guidelines to improve the scalar gradient and dissipation experiments are proposed, based on these model study results. Finally, the proposed system approach can also be applied to other derived quantities involving complex transfer functions.},
doi = {10.1088/0957-0233/18/5/015},
journal = {Measurement Science and Technology},
number = 5,
volume = 18,
place = {United States},
year = {Tue Mar 13 00:00:00 EDT 2007},
month = {Tue Mar 13 00:00:00 EDT 2007}
}
Web of Science
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