Study of the influence of asymmetrical hulls on the hydrodynamics of a river catamaran 1000 ton capacity

The article presents the results of numerical modeling hydrodynamics of the catamaran with a capacity of 1000 tons and asymmetric hulls. The results of the M.Ya. Alferyev resistance studies of a river catamarans were used in the modeling. The numerical simulation parameters and the computational mesh were set based on verification with the results of model experiments. Comparing showed good agreement with towing test data. A full-size catamaran was modeled to eliminate scale effects in the Froude number range from 0.145 to 0.255. Based on the simulation results, graphs of the change in drag coefficients depending on the Froude numbers and relative catamaran's clearances were constructed. The results of the study allow us to state that the asymmetry of the hull in the ratio of 0.35 to 0.65 with a narrower part inward does not have a significant effect on the drag coefficients in the specified range of Froude numbers compared to a symmetrical hull. At the same time, the wave heights at the stern of the catamaran depend significantly on asymmetry and are lower for an asymmetrical hull than for a symmetrical one.