The Inertia Contributions due to Floodwater Mass

Abstract

The Stability in Waves committee of the 27th ITTC investigated how to deal with the ship inertia contributions due to floodwater mass from three points of view: (1) floodwater domain, (2) floodwater inertia itself, (3) floodwater entering the ship. The committee suggested three criteria indicating the concept of how to deal with floodwater and providing clues on what to consider as floodwater when examining damaged ships: (1) whether the water is moving with the ship and the mass of that volume of water, (2) whether there is a significant pressure jump across the compartment boundary, and (3) whether the dynamics of water can be solved separately. For floodwater inertia, the committee divided this into the partially flooded case and fully flooded case, and investigated the properties and showed how to deal with floodwater inertia for each case. For the case of the floodwater entering the ship, the treatment of the inertia change due to floodwater was derived using the momentum change principle. The related ITTC procedure was updated reflecting this work.