Design and implementation of hydrodynamic integrat

Design and implementation of ship hydrodynamic integrated design system

shids (ship hydraulics integrated design system) is an integrated design system for ship hydrodynamic performance developed by China Shipbuilding Research Center. Taking low-speed ships with large square coefficient (mainly large and super large oil tankers) and medium high-speed ships with medium square coefficient (mainly large and medium container ships) as the research objects, and relying on the ship type and performance database, the navigation performance is predicted, evaluated and optimized, and the most appropriate ship type dimensions and shape details that meet user requirements are determined from the comprehensive point of view of rapidity, seakeeping and maneuverability, Thus, China's plastic extruder industry is moving forward healthily and persistently to design ship forms with excellent comprehensive performance

how to integrate the SHIDS system into the ANSYS Workbench platform, make full use of the characteristics of the workbench platform, such as easy to use, convenient data exchange, strong scalability and so on, and make the SHIDS system more practical is the key problem of design and implementation

1. SHIDS system framework and modules

the whole system includes conceptual design module, six calculation modules of ship form generation, hydrostatic force, resistance prediction, self navigation factor prediction, maneuverability prediction, seakeeping prediction, linear preview, result graphic view, document view, report generation, project management and other auxiliary function modules, as well as a CFD calculation interface

Figure 1 SHIDS system framework

2 ANSYS Workbench framework and secondary development method

workbench framework provides an integrated environment that allows users to run multiple applications at the same time, and can realize the sharing of engineering data and parameters among applications. The workbench framework itself does not contain any engineering applications

the framework supports customized development. Users can integrate their own or third-party independent applications into the workbench, regardless of the version of the workbench

Figure 2 basic structure of workbench framework

solution

workbench user development tool allows users to establish a unique set of workflow or control according to the requirements of a product or process. SDK is the main interface to integrate other external programs under the workbench architecture. Scripts and XML provide the main tools to create process control (workbench simulation wizard) in the workbench environment

main interface

workbench 1.1 mechanical method: there are lever method and spring method. The menus and toolbars in the interface are organized in the form of XML. The method of window design is to divide the view into different parts as required, and then load different contents in the divided view area, such as 3D graphic controls, tree structures, pages, text files, etc

Figure 1 the main interface of SHIDS realizes line shape generation and preview

the line shape generation module provides the generation algorithm of several series of ship shapes, and the output result of the module is the ship shape value table defined by SHIDS. According to the group_ id node_ The format of ID X Y Z is reorganized into the coordinate file acceptable to the DM module of ANSYS Workbench, and the hull linetype diagram can be drawn by using the 3D curve modeling function of DM

hydrodynamic performance prediction

the prediction of hydrodynamic performance in the system depends on a set of dynamic link libraries written in c++. After entering the parameters required by the calculation program, the user first saves the parameters to a temporary file, then calculates and returns the results through the corresponding calculation program, and finally displays the results graphically. Figure 2 shows the calling process of hydrodynamic performance calculation program. Figure 3 is the result diagram of seakeeping prediction (including heave, pitch, roll and resistance increase)

Figure 2 hydrodynamic performance calculation process

Figure 3 seakeeping prediction result schematic diagram

CFD calculation interface

the system uses gambit as the preprocessor of hull CFD analysis, and uses gambit script file to realize the automation of calculation domain division, boundary setting, etc. CFD calculation with fluent. Figure 4 shows the lattice diagram of gambit computing domain lattice after automatic division. Figure 5 shows several CFD results after fluent calculation

Figure 4 gambit calculation domain lattice division

Figure 5 fatigue testing machine is composed of five parts: host, high temperature furnace, high temperature fixture, high temperature deformation, and measurement and control device. Fluent result post-processing (pressure distribution on the hull surface, wake on the propeller disk surface, resistance, wave height distribution)

user value

the SHIDS system is integrated into the ANSYS Workbench platform, making full use of the characteristics of the workbench platform, such as easy to use, convenient data exchange, strong scalability, etc, Make the SHIDS system more practical. Most of the calculation methods used in the performance calculation module are the latest first-class mature achievements, especially the performance calculation of the large square coefficient low-speed ship and the medium square coefficient medium high-speed ship is based on the series test data of the two major ship models, and the results are reliable, practical and progressiveness. The CFD calculation interface can quickly carry out CFD analysis on the generated ship form. The implementation of the system provides a solution for the preliminary design of the ship for the workbench platform

customer evaluation

ansys workbench environment (AWE) is a new generation of pre and post-processing environment developed by ANSYS company, and is set as a CAE collaboration platform. This environment provides a high degree of integration with CAD software and design process, and the new version adds many software modules of ANSYS and realizes many common functions, In product development, the task of the laboratory machine manufacturer is to provide a highly flexible data interface, which can quickly apply CAE technology for analysis, so as to reduce the product design cycle and improve the added value of the product

integrating SHIDS into the ANSYS Workbench environment can provide a solution for the preliminary design of ships for ANSYS Workbench on the one hand; On the other hand, it also enhances the practicality of the SHIDS system, and in the framework of workbench, it is easy to realize data transmission and sharing between many software modules of SHIDS and ANSYS. (end)