Thermal-fluid modeling of single-and two-phase flows in the W7-X high heat flux divertor scraper element

E. Clark; K. Ekici; A. Lumsdaine; C. Barbier; J. Harris; D. McGinnis; J. D. Lore; J. Boscary; J. Tretter

doi:10.1109/SOFE.2015.7482430

Thermal-fluid modeling of single-and two-phase flows in the W7-X high heat flux divertor scraper element

E. Clark, K. Ekici, A. Lumsdaine, C. Barbier, J. Harris, D. McGinnis, J. D. Lore, J. Boscary, J. Tretter

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

1 Scopus citations

Abstract

The Wendelstein 7-X (W7-X) stellarator experiment is scheduled to begin operation in 2015 with steady-state operation planned for 2019. During the steady-state operation, certain simulated plasma scenarios have been shown to produce heat fluxes that surpass the technological limits on the edges of the divertor target elements. To reduce the heat load on the target elements, the addition of a scraper element (SE) in ten divertor locations is under investigation. Two aspects of thermal-fluid modeling for the W7-X SE components are analyzed in this paper using the ANSYS CFX 15.0 software: (1) sensitivity to turbulence models in single-phase and (2) two-phase modeling with the standard k-epsilon model. The results from the single-phase survey of seven turbulence models reveal a significant sensitivity to the selected model in the thermal-hydraulic analysis. Two-phase modeling is completed with the k-epsilon turbulence model, but no vapor generation is recorded. A significant temperature gradient between the liquid-solid interface indicates the need for a turbulence model that can achieve higher mesh resolution in the near-wall region.

Original language	English
Title of host publication	2015 IEEE 26th Symposium on Fusion Engineering, SOFE 2015
Publisher	Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)	9781479982646
DOIs	https://doi.org/10.1109/SOFE.2015.7482430
State	Published - May 31 2016
Event	26th IEEE Symposium on Fusion Engineering, SOFE 2015 - Austin, United States Duration: May 31 2015 → Jun 4 2015

Publication series

Name	Proceedings - Symposium on Fusion Engineering
Volume	2016-May

Conference

Conference	26th IEEE Symposium on Fusion Engineering, SOFE 2015
Country/Territory	United States
City	Austin
Period	05/31/15 → 06/4/15

Keywords

CFD
swirl flow
turbulence
two-phase

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1109/SOFE.2015.7482430

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Clark, E., Ekici, K., Lumsdaine, A., Barbier, C., Harris, J., McGinnis, D., Lore, J. D., Boscary, J., & Tretter, J. (2016). Thermal-fluid modeling of single-and two-phase flows in the W7-X high heat flux divertor scraper element. In 2015 IEEE 26th Symposium on Fusion Engineering, SOFE 2015 Article 7482430 (Proceedings - Symposium on Fusion Engineering; Vol. 2016-May). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/SOFE.2015.7482430

@inproceedings{5614b2b437e6477eb4d5f64d80cbe941,

title = "Thermal-fluid modeling of single-and two-phase flows in the W7-X high heat flux divertor scraper element",

abstract = "The Wendelstein 7-X (W7-X) stellarator experiment is scheduled to begin operation in 2015 with steady-state operation planned for 2019. During the steady-state operation, certain simulated plasma scenarios have been shown to produce heat fluxes that surpass the technological limits on the edges of the divertor target elements. To reduce the heat load on the target elements, the addition of a scraper element (SE) in ten divertor locations is under investigation. Two aspects of thermal-fluid modeling for the W7-X SE components are analyzed in this paper using the ANSYS CFX 15.0 software: (1) sensitivity to turbulence models in single-phase and (2) two-phase modeling with the standard k-epsilon model. The results from the single-phase survey of seven turbulence models reveal a significant sensitivity to the selected model in the thermal-hydraulic analysis. Two-phase modeling is completed with the k-epsilon turbulence model, but no vapor generation is recorded. A significant temperature gradient between the liquid-solid interface indicates the need for a turbulence model that can achieve higher mesh resolution in the near-wall region.",

keywords = "CFD, swirl flow, turbulence, two-phase",

author = "E. Clark and K. Ekici and A. Lumsdaine and C. Barbier and J. Harris and D. McGinnis and Lore, {J. D.} and J. Boscary and J. Tretter",

note = "Publisher Copyright: {\textcopyright} 2015 IEEE.; 26th IEEE Symposium on Fusion Engineering, SOFE 2015 ; Conference date: 31-05-2015 Through 04-06-2015",

year = "2016",

month = may,

day = "31",

doi = "10.1109/SOFE.2015.7482430",

language = "English",

series = "Proceedings - Symposium on Fusion Engineering",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

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Clark, E, Ekici, K, Lumsdaine, A, Barbier, C, Harris, J , McGinnis, D , Lore, JD, Boscary, J & Tretter, J 2016, Thermal-fluid modeling of single-and two-phase flows in the W7-X high heat flux divertor scraper element. in 2015 IEEE 26th Symposium on Fusion Engineering, SOFE 2015., 7482430, Proceedings - Symposium on Fusion Engineering, vol. 2016-May, Institute of Electrical and Electronics Engineers Inc., 26th IEEE Symposium on Fusion Engineering, SOFE 2015, Austin, United States, 05/31/15. https://doi.org/10.1109/SOFE.2015.7482430

Thermal-fluid modeling of single-and two-phase flows in the W7-X high heat flux divertor scraper element. / Clark, E.; Ekici, K.; Lumsdaine, A. et al.
2015 IEEE 26th Symposium on Fusion Engineering, SOFE 2015. Institute of Electrical and Electronics Engineers Inc., 2016. 7482430 (Proceedings - Symposium on Fusion Engineering; Vol. 2016-May).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Thermal-fluid modeling of single-and two-phase flows in the W7-X high heat flux divertor scraper element

AU - Clark, E.

AU - Ekici, K.

AU - Lumsdaine, A.

AU - Barbier, C.

AU - Harris, J.

AU - McGinnis, D.

AU - Lore, J. D.

AU - Boscary, J.

AU - Tretter, J.

PY - 2016/5/31

Y1 - 2016/5/31

N2 - The Wendelstein 7-X (W7-X) stellarator experiment is scheduled to begin operation in 2015 with steady-state operation planned for 2019. During the steady-state operation, certain simulated plasma scenarios have been shown to produce heat fluxes that surpass the technological limits on the edges of the divertor target elements. To reduce the heat load on the target elements, the addition of a scraper element (SE) in ten divertor locations is under investigation. Two aspects of thermal-fluid modeling for the W7-X SE components are analyzed in this paper using the ANSYS CFX 15.0 software: (1) sensitivity to turbulence models in single-phase and (2) two-phase modeling with the standard k-epsilon model. The results from the single-phase survey of seven turbulence models reveal a significant sensitivity to the selected model in the thermal-hydraulic analysis. Two-phase modeling is completed with the k-epsilon turbulence model, but no vapor generation is recorded. A significant temperature gradient between the liquid-solid interface indicates the need for a turbulence model that can achieve higher mesh resolution in the near-wall region.

AB - The Wendelstein 7-X (W7-X) stellarator experiment is scheduled to begin operation in 2015 with steady-state operation planned for 2019. During the steady-state operation, certain simulated plasma scenarios have been shown to produce heat fluxes that surpass the technological limits on the edges of the divertor target elements. To reduce the heat load on the target elements, the addition of a scraper element (SE) in ten divertor locations is under investigation. Two aspects of thermal-fluid modeling for the W7-X SE components are analyzed in this paper using the ANSYS CFX 15.0 software: (1) sensitivity to turbulence models in single-phase and (2) two-phase modeling with the standard k-epsilon model. The results from the single-phase survey of seven turbulence models reveal a significant sensitivity to the selected model in the thermal-hydraulic analysis. Two-phase modeling is completed with the k-epsilon turbulence model, but no vapor generation is recorded. A significant temperature gradient between the liquid-solid interface indicates the need for a turbulence model that can achieve higher mesh resolution in the near-wall region.

KW - CFD

KW - swirl flow

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KW - two-phase

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DO - 10.1109/SOFE.2015.7482430

M3 - Conference contribution

AN - SCOPUS:84978916751

T3 - Proceedings - Symposium on Fusion Engineering

BT - 2015 IEEE 26th Symposium on Fusion Engineering, SOFE 2015

PB - Institute of Electrical and Electronics Engineers Inc.

T2 - 26th IEEE Symposium on Fusion Engineering, SOFE 2015

Y2 - 31 May 2015 through 4 June 2015

ER -

Clark E, Ekici K, Lumsdaine A, Barbier C, Harris J , McGinnis D et al. Thermal-fluid modeling of single-and two-phase flows in the W7-X high heat flux divertor scraper element. In 2015 IEEE 26th Symposium on Fusion Engineering, SOFE 2015. Institute of Electrical and Electronics Engineers Inc. 2016. 7482430. (Proceedings - Symposium on Fusion Engineering). doi: 10.1109/SOFE.2015.7482430

Thermal-fluid modeling of single-and two-phase flows in the W7-X high heat flux divertor scraper element

Abstract

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Keywords

UN SDGs

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