Active and Passive Sloshing Mitigation in Tanks
- Philipp Behruzi (ArianeGroup GmbH) | Francesco De Rose (ArianeGroup GmbH)
- Document ID
- International Society of Offshore and Polar Engineers
- The 28th International Ocean and Polar Engineering Conference, 10-15 June, Sapporo, Japan
- Publication Date
- Document Type
- Conference Paper
- 2018. International Society of Offshore and Polar Engineers
- CFD, sloshing, active control, damping, baffles
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- 29 since 2007
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Sloshing is of concern in partially filled moving liquid tanks. Spacecrafts have strong constraints in controlling liquid sloshing since sloshing impacts the vehicle motion e.g. during launch. Very often high liquid / rigid body mass ratios occur. Passive sloshing damping is thus a common technique. On the other side active sloshing damping concepts are under development to mitigate sloshing. The utilized modelling techniques may also be useful for the shipping industry whenever large amounts of liquid are being stored, e.g. in bunkering ships. The paper gives an overview on technologies mitigating sloshing in an active and passive manner.
Sloshing in tanks is one of the major physical aspects being studied for ship as well as for spacecraft tanks. Both shipping and spacecraft industries put a strong focus on the understanding and modeling of sloshing phenomena. Main goal is reducing the impact of liquid sloshing in tanks. Sloshing is of main concern for example in LNG prismatic tanks during wave impact on the membrane walls; see for example Behruzi et al. (2017) where further information concerning the current state-of-the art may be found. The accurate prediction of the impact loads is pursued. Phase change may also play a significant role since cryogenic liquids are involved. In rocket tanks sloshing forces may bring additional disturbances which need to be counter balanced by the rocket's flight controller. Sloshing also has a significant impact on the tank pressure when cryogenic liquids, for example liquid hydrogen, oxygen, LNG or methane are involved. The maturation of software tools which are able to predict sloshing phenomena is consequently of special interest for both industries. Very similar goals are pursued. Active and passive sloshing control is therefore of similar interest. Using passive sloshing baffles is standard. Proper prediction of damping coefficients is essential. Sloshing effects may however also be actively damped, e.g. by active control.
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