On the convective disturbances induced by g-jitter on the space station

R. Monti, R. Savino, M. Lappa

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Abstract

A numerical tool has been prepared to quickly predict the overall disturbances for the typical Microgravity Environment (MGE) on the ISS. A reference study case (that shows a large sensitivity to acceleration disturbances) is identified and numerical simulations are carried out to compare the results of the solution of the full Navier-Stokes equations with a time-dependent acceleration (that give the instantaneous time-dependent flow) with the solutions of the time-averaged field equations (Gershuni formulation), containing all the g-jitter terms (like those that identify the microgravity environment of the ISS) grouped in a single parameter. The paper shows that the overall disturbances of the thermo-fluid-dynamic field are easily evaluated assigning as input to the fluid-dynamic code a single (equivalent) frequency g-jitter (in the direct formulation) or an overall vibrational Rayleigh number (in the time-averaged formulation). The code is validated and applied to the problem of thermodiffusion in a typical metal alloy.
Original languageEnglish
Title of host publication51st Congress of the International Astronautical Federation, Rio de Janeiro, Brazil, 2-6 October 2000
Number of pages13
Publication statusPublished - 6 Oct 2000
Event51st Congress of the International Astronautical Federation, 2000 - Rio de Janeiro, Brazil
Duration: 2 Oct 20006 Oct 2000

Other

Other51st Congress of the International Astronautical Federation, 2000
CountryBrazil
CityRio de Janeiro
Period2/10/006/10/00

Keywords

  • microgravity
  • g-jitter
  • Navier-Stokes equations
  • convective disturbances
  • fluid dynamics

Cite this

Monti, R., Savino, R., & Lappa, M. (2000). On the convective disturbances induced by g-jitter on the space station. In 51st Congress of the International Astronautical Federation, Rio de Janeiro, Brazil, 2-6 October 2000 [IAF-00-J.2.03]