A CFD-Based Parametric Study On The Smoke Behavior Of A Typical Merchant Ship

Abstract

This chapter introduces a CFD based parametric study, which is intended to investigate the smoke behavior of a merchant ship depending on the funnel and accommodation arrangement. Corresponding calculation results were analyzed systematically and a simple measure was obtained, which could be applied to the preliminary design of funnel and accommodation arrangement. In modeling the geometry, elements having minor effects on the flow field were excluded, and its reasonableness was proved by some precalculations. It was concluded that the hull must be modeled, but the radar mast and on-deck pipe system need not to be modeled due to their minor effects on the flow field around the funnel. The smoke exhaust performance is not directly influenced by the deckhouse height but it improves with the increase of the funnel height. In practical design, the funnel would show a satisfactory smoke exhaust performance when the ratio of funnel height to deckhouse height is 1.3 or larger. The effect of the funnel position on the smoke behavior did not appear obviously when the calculation results were inspected with individual measures, because the range of the variation was somewhat small. But when all the estimation results were taken into consideration, it could be concluded that it is beneficial to the smoke exhaust performance to locate the funnel as far away from the deckhouse as possible.