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confined states in large aspect ratio thermohaline convection. [microform]
confined states in large aspect ratio thermohaline convection. [microform]
상세정보
- 자료유형
- 마이크로피시
- 청구기호
- 저자명
- 서명/저자
- confined states in large aspect ratio thermohaline convection. - [microform]
- 발행사항
- 형태사항
- 211 p. : microfiches ; 11×15 cm.
- 총서명
- UMI Dissertation
- 주기사항
- Source: Dissertation Abstracts International, Volume: 58-01, Section: B, page: 0258.
- 학위논문주기
- thesis (ph.d.)-- - university of colorado at boulder, 1996.
- 초록/해제
- 요약In this thesis we analyze some of the properties and formation mechanisms of confined states in thermohaline convection. A two-dimensional, large aspect ratio domain is employed for the numerical simulation of the physical convection cell. No-slip boundary conditions for the top and bottom plates are used rather than the more common (but unrealistic) free-slip ones. Periodic boundary conditions in the horizontal ensure that the dynamics obtained are not influenced by end-wall effects. The physical parameters of the problem are chosen so as to make contact with earlier studies on pattern formation in thermohaline convection.
- 초록/해제
- 요약Confined states are found in the form of traveling pulses in a back-ground of moving convection rolls. These pulses greatly influence the local transport properties of heat and salt and provide for the dynamic coexistence of regions of differing wavelength connected by sharp interfaces. Such types of confined states differ from the ones reported for binary fluid convection. Contrary to other double-diffusive confined states, the ones studied here cannot be obtained as perturbations of the quiescent conduction state.
- 초록/해제
- 요약A large space-time scale dynamics associated with the pulses in the form of moving clusters of vortices is found by temporal averaging the roll dynamics in a reference frame co-moving with the pulses. The interaction between the short scale dynamics of the rolls and the large scale dynamics of these vortices in the formation of the pulses is discussed.
- 초록/해제
- 요약A possible approach to the pulse formation process in terms of the continuous symmetries of the problem is proposed and the results of considering only translation invariance are analyzed. Translation invariance alone provides a qualitative explanation for the formation of pulses in terms of an equation for the phase-shift of an otherwise unmodulated, fully developed nonlinear traveling wave state. The velocity of the pulse obtained this way is locked to the (constant) velocity of the rolls. When the different roll velocities are incorporated into the model in an empirical way, the original underlying state is recovered by appropriate moving-frame time averages of the pulsed states.
- 복제주기
- Microfiche : UMI . microfiches;11×15 cm.
- 일반주제명
- 일반주제명
- 키워드
- 기타저자
- 기본자료저록
- Dissertation Abstracts International. 58-01B.
MARC
008970923s1996 us eng■001MOKWON00234854
■001AAV9717639
■00519981006105041
■008970923s1996 us eng
■035 ▼a(UnM)AAV9717639
■040 ▼aUnM▼cUnM▼dMOKWON
■090 ▼a530▼bS757c
■1001 ▼aspina, alejandro.
■24510▼aconfined states in large aspect ratio thermohaline convection.▼h[microform]
■260 ▼aU.S.▼buniversity of colorado at boulder▼c1996.
■300 ▼a211 p.▼bmicrofiches▼c11×15 cm.
■350 ▼a$50.6
■44000▼aUMI Dissertation
■500 ▼aSource: Dissertation Abstracts International, Volume: 58-01, Section: B, page: 0258.
■502 ▼athesis (ph.d.)--▼buniversity of colorado at boulder▼d1996.
■520 ▼aIn this thesis we analyze some of the properties and formation mechanisms of confined states in thermohaline convection. A two-dimensional, large aspect ratio domain is employed for the numerical simulation of the physical convection cell. No-slip boundary conditions for the top and bottom plates are used rather than the more common (but unrealistic) free-slip ones. Periodic boundary conditions in the horizontal ensure that the dynamics obtained are not influenced by end-wall effects. The physical parameters of the problem are chosen so as to make contact with earlier studies on pattern formation in thermohaline convection.
■520 ▼aConfined states are found in the form of traveling pulses in a back-ground of moving convection rolls. These pulses greatly influence the local transport properties of heat and salt and provide for the dynamic coexistence of regions of differing wavelength connected by sharp interfaces. Such types of confined states differ from the ones reported for binary fluid convection. Contrary to other double-diffusive confined states, the ones studied here cannot be obtained as perturbations of the quiescent conduction state.
■520 ▼aA large space-time scale dynamics associated with the pulses in the form of moving clusters of vortices is found by temporal averaging the roll dynamics in a reference frame co-moving with the pulses. The interaction between the short scale dynamics of the rolls and the large scale dynamics of these vortices in the formation of the pulses is discussed.
■520 ▼aA possible approach to the pulse formation process in terms of the continuous symmetries of the problem is proposed and the results of considering only translation invariance are analyzed. Translation invariance alone provides a qualitative explanation for the formation of pulses in terms of an equation for the phase-shift of an otherwise unmodulated, fully developed nonlinear traveling wave state. The velocity of the pulse obtained this way is locked to the (constant) velocity of the rolls. When the different roll velocities are incorporated into the model in an empirical way, the original underlying state is recovered by appropriate moving-frame time averages of the pulsed states.
■533 ▼aMicrofiche▼cUMI▼emicrofiches;11×15 cm.
■590 ▼aSchool code: 0051.
■650 4▼aPhysics, Fluid and Plasma
■650 4▼aMathematics
■653 ▼aconfined▼astates▼ain▼alarge▼aaspect▼aratio▼athermohaline▼aconvection.
■690 ▼a0759
■690 ▼a0405
■71020▼auniversity of colorado at boulder.
■7730 ▼tDissertation Abstracts International▼g58-01B.
■790 ▼a0051
■791 ▼aPH.D.
■792 ▼a1996
![confined states in large aspect ratio thermohaline convection. - [microform]](/Sponge/Images/bookDefaults/NNbookdefaultsmall.png)


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