Assessment of the thermovibrational theory: application to g-jitter on the space-station

Raffaele Savino, Marcello Lappa

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

This paper deals with the numerical modelling of the effects of g-jitter (oscillatory residual acceleration disturbances) of the type prevailing on the International Space Station. Aim of the work is the extension of the averaging technique, initially introduced by the thermovibrational theory, by evaluating the orders of magnitude of all the terms appearing in the complete equations and identifying the role and the importance of average and periodic terms. The evaluation of the most important terms in the momentum and in the energy equation is made by an “a posteriori” order of magnitude analysis (OMA) by means of the numerical solution of the unsteady full Navier Stokes equations. The discussion of the results identify different regimes and help clarifying some apparent contradictions in the current literature on the effects of g-jitter on temperature disturbances generated by convective motions. The identification of the set of “reduced” equations and associated ranges of validity is of potential great importance for the scientific community. They in fact can be used to obtain analytical and/or mixed numerical/analytical solutions that can lead to a significant reduction of the often prohibitive computational time required for the simulation of the phenomena under investigation.
LanguageEnglish
Pages201-210
Number of pages10
JournalJournal of Spacecraft and Rockets
Volume40
Issue number2
DOIs
Publication statusPublished - 30 Apr 2003

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space stations
Space stations
Jitter
vibration
disturbances
Navier Stokes equations
disturbance
Momentum
Navier-Stokes equations
International Space Station
Navier-Stokes equation
momentum
evaluation
Temperature
modeling
simulation
energy
station
temperature
effect

Keywords

  • thermovibrational theory
  • numerical modeling
  • g-jitter
  • international space station
  • fluid dynamics
  • Navier–Stokes equations

Cite this

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abstract = "This paper deals with the numerical modelling of the effects of g-jitter (oscillatory residual acceleration disturbances) of the type prevailing on the International Space Station. Aim of the work is the extension of the averaging technique, initially introduced by the thermovibrational theory, by evaluating the orders of magnitude of all the terms appearing in the complete equations and identifying the role and the importance of average and periodic terms. The evaluation of the most important terms in the momentum and in the energy equation is made by an “a posteriori” order of magnitude analysis (OMA) by means of the numerical solution of the unsteady full Navier Stokes equations. The discussion of the results identify different regimes and help clarifying some apparent contradictions in the current literature on the effects of g-jitter on temperature disturbances generated by convective motions. The identification of the set of “reduced” equations and associated ranges of validity is of potential great importance for the scientific community. They in fact can be used to obtain analytical and/or mixed numerical/analytical solutions that can lead to a significant reduction of the often prohibitive computational time required for the simulation of the phenomena under investigation.",
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Assessment of the thermovibrational theory : application to g-jitter on the space-station. / Savino, Raffaele; Lappa, Marcello.

In: Journal of Spacecraft and Rockets, Vol. 40, No. 2, 30.04.2003, p. 201-210.

Research output: Contribution to journalArticle

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