Abstract
Liquid-propellant slosh events occurring during orbital maneuvers of a rocket’s upper stage may adversely affect vehicle performance. Mission planners require accurate and validated simulation tools to understand and predict the effects of slosh on the intended trajectory of the vehicle, as well as for propellant and tank thermal management. A coupledrigid-bodyandfluid-dynamicsnumerical tool is presentedwhich canbeused topredict the effect of internalfluid slosh on a tank’s trajectory. To benchmark the numerical tool, a novel experimental framework is presented which examines the influence of liquid slosh on the trajectory of moving tanks with multiple degrees of freedom. The motion history of the tank is measured along with synchronized camera images of the liquid distribution within the tank. The acquiredexperimentaldataareused toassess the accuracyof thenumerical tool.Thepredictions fromthenumerical tool are in excellent agreement with the experimentally measured data over a wide range of tank motion profiles.
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