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International audienceAquaculture structures are responsible for flow disturbances that extendover a large range of scales. In the case of shellfish aquaculture, those scales extendfrom the size of an individual shellfish to the size of a whole farm with intermediatescales being the size of a shellfish structure or of a block of shellfish structures. Theinfluence of block spacing and angle is investigated by the mean of a 2D high resolutioncomputational fluid dynamics model. Block angle is found to be the main relevantparameter controlling to a large extent the mixing generated by the shellfish structures.Strong sensitivity is found for small angles. Nevertheless, it is shown that for a limitednumber of blocks, upstream turbulence still dominates the degree of the total mixingwithin the farm, and that total flow reduction is little affected by the orientation ofthe blocks. A simple analytical model is presented that predicts most of the numericalresults

High-resolution computational fluid dynamics modelling of suspended shellfish structures