Hydrodynamics Of River-sea Going Ship In Shallow Water

The State Council put the construction of the Yangtze golden waterway as the promotion strategy of the Yangtze River shipping and economic development of the Yangtze River Economic Belt along the Yangtze River,and also introduced the related financial subsidy policy in improving the channel conditions,promote transportation of large vessels and river,part of the society has enacted the relevant inspection specification for the river sea going ship.Due to large ships will reduce transportation costs and emission index(EEDI),in the policy and economic double oriented,and in the foundation of improving the navigation conditions and improve relevant laws and regulations on large scale and river sea going is one of the current trends in the development.The shallow water effect caused by the limited water depth is one of the traditional hot spots in the study of ship hydrodynamic performance.Despite the implementation and planning of the Yangtze River waterway construction will increase the channel depth as the main target,but the shallow water effect also depends on the ship speed and ship draft which is a relative problem,thus limiting the depth of inland waterway in the development trend of large-scale ship under the problem always exists.The ultimate purpose of the study on the hydrodynamic performance of the ship is to understand the influence of the hydrodynamic parameters such as the geometric parameters and the speed of the ship or ship on the hydrodynamic performance of the ship.But there are still some defects in current resistance of the shallow water effect regularity or conversion method: the study shows that a Liting shallow water resistance correction method of poor applicability in the extremely shallow deep foundation;model of shallow water resistance is extrapolated to ship two dimensional or three dimensional method assumes that there are different degrees of rationality.Based on the project of Ministry of science and technology,the numerical simulation and research of shallow water flow around the low speed river ship is carried out.Through the study on improvement of the shallow water of very shallow water depth and stability and forecast accuracy by ship state numerical simulation ofthe flow field around the ship,and effectively improve the efficiency of the numerical work;through numerical method of decomposition of the ship resistance components and the shallow water effect of different resistance components are discussed;Through the analysis of the numerical results discussed in shallow water on ship wave,pressure distribution of the flow field around the hull of the details;through the analysis of the variation of shallow water resistance and some existing research results of resistance related regression model was proposed with the help of the viscous resistance of the shallow water effect;regression model is presented for ship resistance in shallow water ship conversion method the results of verification;shallow water resistance prediction method improved in finite length Reynolds number range by means of numerical simulation,verification results show that the method in the finite Reynolds number range can effectively improve the prediction accuracy of shallow water resistance.In the current context,based on the flow field characteristics of ship Jianghai direct shallow water is of great importance for the numerical and experimental research object,the research conclusion has strong engineering application value;research status of ship resistance in shallow water at present,according to the research conclusion of ship resistance components and the effect of shallow water flow details also have certain academic significance to understand the regularity and mechanism of resistance of shallow water effect.