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최영명,Bouscasse Benjamin,Ducrozet Guillaume,Seng Sopheak,Ferrant Pierre,김은수,김영준 대한조선학회 2023 International Journal of Naval Architecture and Oc Vol.15 No.-
An efficient methodology for simulating nonlinear irregular waves in a Computational Fluid Dynamics (CFD) solver is proposed. The High Order Spectral (HOS) method is used to generate nonlinear irregular waves in an open ocean and a numerical wave tank. The inverse Fast Fourier Transforms (FFTs) and multi-dimensional interpolation from the HOS simulation results are used for the efficient reconstruction of nonlinear waves in the CFD solver. The proposed procedure is published as an open-source project called Grid2Grid, which is developed to interface with a generic CFD solver. It provides the function Application Programming Interface (API), which can communicate with different programming languages. Extreme wave events were used to validate the proposed procedure. The predicted wave breaking events are reported both in OpenFOAM CFD and HOS simulations, and the wave elevations of CFD during simulations show good agreement with experiments and with HOS simulation.
Does Healthy Food Access Matter in a French Urban Setting?
Caillavet, France,Kyureghian, Gayaneh,Nayga Jr., Rodolfo M.,Ferrant, Coline,Chauvin, Pierre Oxford University Press 2015 AMERICAN JOURNAL OF AGRICULTURAL ECONOMICS - Vol.97 No.5
<P>Limited access to healthy food is commonly regarded as a contributing factor to poor dietary choices. The objective of this article is to test this hypothesis in a French context given France's increasing obesity rates and incidence of poor dietary habits. We use data on fruit and vegetable consumption frequency and different food retail availability measures, for example the number of food stores, food surface area, and a dispersion measure based on store numbers, store types, and food area surface, from several data sources in France. We also employ different types of geographic units when measuring the food retail environment and instrumental variable model specifications to test the robustness of our results, which indicate that fewer but larger retail outlets increase the odds of consuming the recommended level of fruit and vegetables. We also find that an increase in food supply dispersion will improve fruit and vegetable consumption in Paris, but not in its suburbs.</P>