### 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 language | English |
---|---|

Title of host publication | 51st Congress of the International Astronautical Federation, Rio de Janeiro, Brazil, 2-6 October 2000 |

Number of pages | 13 |

Publication status | Published - 6 Oct 2000 |

Event | 51st Congress of the International Astronautical Federation, 2000 - Rio de Janeiro, Brazil Duration: 2 Oct 2000 → 6 Oct 2000 |

### Other

Other | 51st Congress of the International Astronautical Federation, 2000 |
---|---|

Country | Brazil |

City | Rio de Janeiro |

Period | 2/10/00 → 6/10/00 |

### 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]