An uncertainty quantification and sensitivity analysis computational technique based on the Monte Carlo method has been used for CubeSat drag studies for exploring issues in satellite decommissioning. These studies included computational simulations for altitudes of 100 and 400 km using the Hypersonic Aerothermodynamic Particle code, a direct simulation Monte Carlo solver with uncertainty quantification and sensitivity analysis capabilities allowing for variation of the solver input quantities, propagation of the input parameter variations through the model, and prediction of output uncertainties, all in an automated manner. Satellite atmospheric drag was identified as the main parameter of interest because uncertainty in drag may alter the satellite orbit and influence its lifespan. This study considers relative contributions of the input and model parameter uncertainties to the resulting satellite drag uncertainty, which enable reduction of the initial parameter space to a few major contributors; these major contributions are then examined in detail. The effect of surface thermal accommodation coefficient is one of the parameters considered, and it is found that its contribution has opposite effects on the drag force in free molecular and collisional flows. The study demonstrates the ability of the numerical techniques to solve the flow cases for a specified accuracy.


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    Titel :

    Satellite Drag Uncertainties Associated with Atmospheric Parameter Variations at Low Earth Orbits


    Beteiligte:
    Titov, E. (Autor:in) / Burt, J. (Autor:in) / Josyula, E. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2014-04-08


    Format / Umfang :

    9 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch