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confined states in large aspect ratio thermohaline convection. [microform]
confined states in large aspect ratio thermohaline convection. - [microform]
confined states in large aspect ratio thermohaline convection. [microform]

상세정보

자료유형  
 마이크로피시
청구기호  
530 S757c
    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

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