Study On Calculation Of Submarine Hydrodynamics And Generation Of Hull Lines

Submarine is a type of complex three-dimension geometric body, which has several appendages. The flow fields around sail zone, tail wings and main hull are all typical phenomena of three dimensional main/appendages flow. This type of flow has not only complex flow separation, but the character of unsteady bringing noise. Therefore, it is important to calculate the hydrodynamics of submarine, and get optimal performance of hydrodynamics on the basis of determining the location and junction form of main/appendix body properly. To get it, we frequently turn to experiments in the past. Still, it has some disadvantages, for it costs more time and fund inevitably. At this point, more economical solutions should be developed to speed the studying course.At present, the CFD software is attracting a lot of attention for it's interface of human-computer dialogue and clear display of flow fields. For this reason, the development of CFD software has attained great support by the area of industry and government. Drawing support from this developing platform of CFD software, researchers can avoid tedious and heavy task of programming, thus accelerate the working procedure and improve the quality and level of research work.This paper utilize business software FLUENT on the numerical simulation of the vicious flow fields of submarine. First, dealing with a model and water droplet type submarine with podium, modeling software GAMBIT and calculator FLUENT are used to calculate the coefficient of heaving force and surface pressure distribution when sailing at respective draft angle, and the corresponding results of experiments and other theoretical calculation were compared with that of this paper, which prove the validity of FLUENT software to solve this kind of problem. Then, dealing with the application of predicting maneuverability of main body and submarine with appendages, heaving force and pitch moment are calculated under certain angle of attack, and get comparatively satisfied, practical results of precision on the project, which has made valuable exploration for the prediction of hydrodynamics of submarine maneuverability. In order to investigate the impacts on hydrodynamicswhen main body and appendages of submarine locate in different relative position, the hydrodynamics of submarine at six different positions and the corresponding distribution of wake fields behind stern are calculated. In the end, draw a relatively better position of sail zone after comparing one by one. Because the propeller of submarine is the main source of noise, and the even degree of flow fields where the propeller locate is relevant directly to the intensity of noise, the investigation of flow fields where submarine stern locate seems quite important. This paper has drawn a type of better junction form, proceeding from reality, launching research to the influence of the stern flow fields generated by the different type of junction of tail wings and main body (including tail horizontal wings and rudders). Then, get a relatively better junction form through the comparison of various distributions of flow fields.Admittedly, the relative position of main body and appendages of submarine has important influence on hydrodynamics of submarine, the function of optimization of submarine performance of resistance and lowing shake/noise cannot be ignored, which results from rational cooperation of main body and appendages. On the basis of relative data, after setting up the database of submarine offset value, the author has developed program to generate submarine (main body) hull lines, using NURBS (Non-Uniform Rational B-Spline) method. We can obtain different forms of submarine conveniently by changing offset value, establishing the good foundation which enable the full studying of rational cooperation form how appendages encloses the main body, and the developing of corresponding program used to optimize submarine hydrodynamics adopting NURBS method.