Salt finger convection under the effect of steady wind shear

Ray-Yeng Yang, Hwung Hweng Hwung

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

Abstract

In oceanographic situations where salt fingers may be an important mechanism for the transport of heat and salt in the vertical, velocity shears may also be present. Salt finger convection is analogous to Bénard convection in that the kinetic energy of the motions is obtained from the potential energy stored in the unstable distribution of a stratifying component. On the basis of the thermal analogy it is of interest to discover whether salt fingers are converted into two-dimensional sheets by the wind shear, and how the vertical fluxes of heat and salt are changed by the wind shear. Salt finger convection under the effect of steady wind shear is theoretically examined in this paper. The evolution of instability developing in the presence of a vertical density gradient disturbance and the horizontal Couette flow is considered near the onset of salt fingers under a moderate rate of shear. We use velocity as the basic variable and solve the pressure Poisson equation in terms of the associated Green function. Growth competition between the longitudinal rolls (LR) and the transverse rolls (TR), whose axes are respectively in the direction parallel to and perpendicular to the Couette flow, is investigated by the weakly nonlinear analysis of coupled-mode equations. The results show that the TR mode is characterized in some range of the effective Rayleigh number, and that the stability is dominated by the LR mode in the system.

Original languageEnglish
Title of host publicationProceedings of the 20th (2010) International Offshore and Polar Engineering Conference, ISOPE-2010
Pages980-985
Number of pages6
Publication statusPublished - 2010 Sep 9
Event20th International Offshore and Polar Engineering Conference, ISOPE-2010 - Beijing, China
Duration: 2010 Jun 202010 Jun 25

Publication series

NameProceedings of the International Offshore and Polar Engineering Conference
Volume1
ISSN (Print)1098-6189
ISSN (Electronic)1555-1792

Other

Other20th International Offshore and Polar Engineering Conference, ISOPE-2010
CountryChina
CityBeijing
Period10-06-2010-06-25

Fingerprint

Salts
Poisson equation
Nonlinear analysis
Potential energy
Convection
Green's function
Kinetic energy
Fluxes
Hot Temperature

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Ocean Engineering
  • Mechanical Engineering

Cite this

Yang, R-Y., & Hwung, H. H. (2010). Salt finger convection under the effect of steady wind shear. In Proceedings of the 20th (2010) International Offshore and Polar Engineering Conference, ISOPE-2010 (pp. 980-985). (Proceedings of the International Offshore and Polar Engineering Conference; Vol. 1).
Yang, Ray-Yeng ; Hwung, Hwung Hweng. / Salt finger convection under the effect of steady wind shear. Proceedings of the 20th (2010) International Offshore and Polar Engineering Conference, ISOPE-2010. 2010. pp. 980-985 (Proceedings of the International Offshore and Polar Engineering Conference).
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Yang, R-Y & Hwung, HH 2010, Salt finger convection under the effect of steady wind shear. in Proceedings of the 20th (2010) International Offshore and Polar Engineering Conference, ISOPE-2010. Proceedings of the International Offshore and Polar Engineering Conference, vol. 1, pp. 980-985, 20th International Offshore and Polar Engineering Conference, ISOPE-2010, Beijing, China, 10-06-20.

Salt finger convection under the effect of steady wind shear. / Yang, Ray-Yeng; Hwung, Hwung Hweng.

Proceedings of the 20th (2010) International Offshore and Polar Engineering Conference, ISOPE-2010. 2010. p. 980-985 (Proceedings of the International Offshore and Polar Engineering Conference; Vol. 1).

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

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Yang R-Y, Hwung HH. Salt finger convection under the effect of steady wind shear. In Proceedings of the 20th (2010) International Offshore and Polar Engineering Conference, ISOPE-2010. 2010. p. 980-985. (Proceedings of the International Offshore and Polar Engineering Conference).