A key element of the project will be the development of a marine icing model that is able to estimate ice accumulation on offshore structures using historical metocean data. This will be obtained by refining an existing numerical model to represent heat transfer and spray flux more accurately whilst maintaining an efficient numerical code. This tool shall be able to estimate marine icing loads that enables the user to calculate relevant annual probability of exceedance for loads from marine icing for a given installation and location. The rate of ice accretion is determined by the amount of water hitting a surface per time and the heat transfer from the surface, and both must be accurately predicted for marine icing models to give reliable results. Due to a limited number of available sea spray measurements, all existing models are associated with a large uncertainty in the amount of sea spray. The project aims to reduce the uncertainty related to prediction of sea spray production to an acceptable level by performing measurements on a number of installations offshore. The project includes the development of suitable equipment for reliable long-term measurements of sea spray flux, frequency and duration. The results from these measurements will be used as a basis for a sea spray model included in the tool for calculation of marine icing.
Project leader: Ole-Christian Ekeberg
Institution: DNV AS