To accurately design the inlet structure of the factory circular recirculating aquaculture tank,based on the computational fluid dynamics technology,fluent software was used to establish a numer-ical model to simulate the flow field distribution characteristics of the inlet pipe in the pond under different inlet angles θ,inlet diameter ratio d/r,and inlet height h in this study.The average velocity vavg and unifor-mity coefficient U were used as the evaluation indexes,and the inlet structure was optimized and analyzed.On the basis of physical experiments that the numerical model can better simulate the flow field characteris-tics in the aquaculture pond,the effects of different inlet structures on the flow field were simulated.The re-sults showed that under the same conditions,the maximum vavg was achieved at θ=40° and the U differ-ence between water layers was minimized;the larger vavg and U was achieved at d/r=0.1 and the U differ-ence between water layers was minimized;the larger vavg was achieved at h=100～400 mm and the U dif-ference between water layers was smallest at h=100 mm.It was shown that the flow field characteristics in the pond were in an optimal state when the inlet angle θ=40°,inlet angle d/r=0.1 and the inlet height h= 100 mm.
recirculating aquaculturecomputational fluid dynamicsinlet structureflow field charac-teristics
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