1. Software overview

NaViiX (Naval Hydrodynamics Oriented CFD Software) is a computational fluid dynamics software developed by the China Ship Science Research Center driven by the endogenous mission and with completely independent intellectual property rights.

2. Software features

This software is designed for the application of ship hydrodynamics CFD engineering, consisting of a total of 7 modules, including 5 basic functional modules: NS equation solving module group, turbulence solving module group, free surface solving module group, multiple grid coupling solving module group, and motion solving and implementation module group; And 2 support module groups: large-scale linear algebra equation group solving module, MPI parallel computing module. Currently, it has the following functions:

● Able to achieve three-dimensional steady and unsteady single-phase turbulence simulation（Re≮1.0E9）

● Capable of achieving three-dimensional steady and unsteady two-phase turbulence simulation (density ratio ≥ 1000)

● Supports structured, unstructured, mixed, arbitrary polyhedral, interface, and sliding grids

● Supports solving in inertial coordinate systems, non inertial coordinate systems, and multi reference coordinate systems

● Support six degrees of freedom motion solving

● Support multiple grid coupling solutions

● Supports MPI parallel computing

● Provide interfaces with major commercial CFD and preprocessing software

3. Software features

1. Fully autonomous and controllable: from the underlying data structure and solving process to matrix solving, parallel computing, etc., all independent research and development, subsequent application and upgrade development, without any restrictions;

2. Excellent grid compatibility: Supports all commonly used CFD grids, including structured grids, unstructured grids, Cartesian grids, various hybrid grids, interface grids, and sliding grids;

3. Rich turbulence/free surface models: support for k- ε、 K- ω、 Multiple series of turbulence models such as LES and DES, supporting high-resolution free surface models such as CICSAM and HRIC;

4. Unrestricted parallel computing: Large scale parallel computing is unrestricted and has achieved large-scale parallel computing on 1.12 billion grids;

5. A large number of systematic verifications have been carried out through standard CFD uncertainty analysis, ITTC international blind comparison, and the use of rich experimental data from research and development units for large-scale sample applications. Systematic verification work has been carried out.

4. Typical applications

Surface vessel resistance/wave making calculation

Hydrodynamics of underwater vehicle with drift angle and oblique navigation

Propeller open water

Energy saving effect evaluation