Artificially ventilated cavities

Evaluating the constant-pressure approximation

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Computational Fluid Dynamics (CFD) is employed to study the fundamental aspects of the internal pressure within artificially ventilated, gaseous cavities in both twin- and toroidal-vortex closure modes. The results show that several pressure regions develop within the cavities, indicating that the common assumption that the cavity has a constant pressure breaks down when evaluated in high detail. The internal cavity pressure is evaluated using a probability density function (PDF). The resulting PDF plots show a clusters with multiple peaks. A mixture-of-Gaussians (MOG) method is employed to better understand the distributions of these peaks. These peaks are then mapped to the simulation results, where it is observed that these peaks correlate to distinct cavity regions (which vary depending on cavity type). Moreover, these varying pressure regions appear to align with cavity-radius growth and reduction and appear to be the driving force of the internal, circulatory flow. Lastly, the importance of these pressure regions are investigated with respect to predictions from semi-empirical theory of the cavity shape, showing a moderate impact depending on where the cavity is probed. Overall, these results provide physical insight into ventilated cavity flow behavior that is often ignored.

Original languageEnglish (US)
Title of host publicationSymposia
Subtitle of host publicationFluid Measurement and Instrumentation; Fluid Dynamics of Wind Energy; Renewable and Sustainable Energy Conversion; Energy and Process Engineering; Microfluidics and Nanofluidics; Development and Applications in Computational Fluid Dynamics; DNS/LES and Hybrid RANS/LES Methods
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791858059
DOIs
StatePublished - Jan 1 2017
EventASME 2017 Fluids Engineering Division Summer Meeting, FEDSM 2017 - Waikoloa, United States
Duration: Jul 30 2017Aug 3 2017

Publication series

NameAmerican Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM
Volume1B-2017
ISSN (Print)0888-8116

Other

OtherASME 2017 Fluids Engineering Division Summer Meeting, FEDSM 2017
CountryUnited States
CityWaikoloa
Period7/30/178/3/17

Fingerprint

Probability density function
Computational fluid dynamics
Vortex flow

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

Cite this

Fronzeo, M. A., Kinzel, M. P., & Lindau, J. W. V. (2017). Artificially ventilated cavities: Evaluating the constant-pressure approximation. In Symposia: Fluid Measurement and Instrumentation; Fluid Dynamics of Wind Energy; Renewable and Sustainable Energy Conversion; Energy and Process Engineering; Microfluidics and Nanofluidics; Development and Applications in Computational Fluid Dynamics; DNS/LES and Hybrid RANS/LES Methods (American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM; Vol. 1B-2017). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/FEDSM2017-69367
Fronzeo, Melissa A. ; Kinzel, Michael P. ; Lindau, Jules Washington V. / Artificially ventilated cavities : Evaluating the constant-pressure approximation. Symposia: Fluid Measurement and Instrumentation; Fluid Dynamics of Wind Energy; Renewable and Sustainable Energy Conversion; Energy and Process Engineering; Microfluidics and Nanofluidics; Development and Applications in Computational Fluid Dynamics; DNS/LES and Hybrid RANS/LES Methods. American Society of Mechanical Engineers (ASME), 2017. (American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM).
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Fronzeo, MA, Kinzel, MP & Lindau, JWV 2017, Artificially ventilated cavities: Evaluating the constant-pressure approximation. in Symposia: Fluid Measurement and Instrumentation; Fluid Dynamics of Wind Energy; Renewable and Sustainable Energy Conversion; Energy and Process Engineering; Microfluidics and Nanofluidics; Development and Applications in Computational Fluid Dynamics; DNS/LES and Hybrid RANS/LES Methods. American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM, vol. 1B-2017, American Society of Mechanical Engineers (ASME), ASME 2017 Fluids Engineering Division Summer Meeting, FEDSM 2017, Waikoloa, United States, 7/30/17. https://doi.org/10.1115/FEDSM2017-69367

Artificially ventilated cavities : Evaluating the constant-pressure approximation. / Fronzeo, Melissa A.; Kinzel, Michael P.; Lindau, Jules Washington V.

Symposia: Fluid Measurement and Instrumentation; Fluid Dynamics of Wind Energy; Renewable and Sustainable Energy Conversion; Energy and Process Engineering; Microfluidics and Nanofluidics; Development and Applications in Computational Fluid Dynamics; DNS/LES and Hybrid RANS/LES Methods. American Society of Mechanical Engineers (ASME), 2017. (American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM; Vol. 1B-2017).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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N2 - Computational Fluid Dynamics (CFD) is employed to study the fundamental aspects of the internal pressure within artificially ventilated, gaseous cavities in both twin- and toroidal-vortex closure modes. The results show that several pressure regions develop within the cavities, indicating that the common assumption that the cavity has a constant pressure breaks down when evaluated in high detail. The internal cavity pressure is evaluated using a probability density function (PDF). The resulting PDF plots show a clusters with multiple peaks. A mixture-of-Gaussians (MOG) method is employed to better understand the distributions of these peaks. These peaks are then mapped to the simulation results, where it is observed that these peaks correlate to distinct cavity regions (which vary depending on cavity type). Moreover, these varying pressure regions appear to align with cavity-radius growth and reduction and appear to be the driving force of the internal, circulatory flow. Lastly, the importance of these pressure regions are investigated with respect to predictions from semi-empirical theory of the cavity shape, showing a moderate impact depending on where the cavity is probed. Overall, these results provide physical insight into ventilated cavity flow behavior that is often ignored.

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Fronzeo MA, Kinzel MP, Lindau JWV. Artificially ventilated cavities: Evaluating the constant-pressure approximation. In Symposia: Fluid Measurement and Instrumentation; Fluid Dynamics of Wind Energy; Renewable and Sustainable Energy Conversion; Energy and Process Engineering; Microfluidics and Nanofluidics; Development and Applications in Computational Fluid Dynamics; DNS/LES and Hybrid RANS/LES Methods. American Society of Mechanical Engineers (ASME). 2017. (American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM). https://doi.org/10.1115/FEDSM2017-69367