This paper numerically studies the steady Coanda effect for drag reduction and airwake manipulations on Chalmers ship model (CSM) using large eddy simulation with wall-adapting local-eddy viscosity model. Numerical methods are validated by experimental data acquired from baseline CSM. In creating flow control model, hanger base of CSM is modified surfaces injection slots along its roof edge two...

Hot deck imputation is a method for handling missing data in which each missing value is replaced with an observed response from a "similar" unit. Despite being used extensively in practice, the theory is not as well developed as that of other imputation methods. We have found that no consensus exists as to the best way to apply the hot deck and obtain inferences from the completed data set. He...

For the design of maritime structures in waves, extreme values responses such as motions and wave impact loads are required. Waves wave-induced stochastic, so should always be related to a probability. This information is not easy obtain for strongly non-linear forces. Usually class rules or direct assessment via experiments numerical simulations applied design. brings up questions convergence ...

This study aims to investigate a friction stir welded joint between steel and aluminum alloy that is employed in maritime applications (i.e., connection the ship over-structures hull or deck). By changing tool rotational direction, advancing retreating side, single lap configuration was studied. Tensile tests were conducted evaluate mechanical resistance surface fracture after preliminary inves...

Due to the complex fluid interference between outrigger and main hull, it is difficult predict trimaran load fluctuation accurately in different marine environments. Therefore, a time-domain Rankine method developed improve accuracy of prediction. This successfully adds nonlinear components simulation by taking into account factors such as instantaneous hull wetted surface, steady ship waves, g...

Traditional GPR Surveys. High-speed GPR surveys have been performed for many years to map the condition of aging bridge deck structures. Most often, one or more 1.0 GHz horn antennas are driven along unique survey paths spaced anywhere from 3 to 4ft apart—and 2 to 3 GPR scans are collected along every linear foot of the deck surface that is being sampled. Surface dielectric properties, signal a...

Let G be a finite abelian group and E a subset of it. Suppose that we know for all subsets T of G of size up to k for how many x ∈ G the translate x + T is contained in E. This information is collectively called the k-deck of E. One can naturally extend the domain of definition of the k-deck to include functions on G. Given the group G when is the k-deck of a set in G sufficient to determine th...

As a typical multi-hull ship, the pentamaran has wider deck, higher damage stability, and low-speed seaworthiness in harsh sea conditions compared with other types such as catamaran trimaran, having more potential for becoming new type of freight merchant ship line development trend marine economy. In this paper, on basis finite volume method, numerical simulations detailed comparative analysis...

Airbus Industrie is considering building a family of double-deck aircraft. A research project was initiated primarily to investigate the effects of the height of the new upper deck on human performance in case of an emergency, but it was also investigated whether factors such as visibility, slide design, and passenger safety instruction might influence individuals‘ performance. A performance mo...