Computational Fluid Dynamics
Fluid dynamics analysis is performed using the CFD software FINE/Marine. This package is the cutting edge of viscous flow analysis used in the maritime and offshore industry, able to determine the total hydrodynamic forces on any geometry in a wide variety of conditions. The package uses the Reynolds-averaged Navier-Stokes (RANS) equations, which allows both frictional and residual forces to be calculated. Also, the wave pattern and flow behavior around the geometry can be analyzed and visualized, including viscous effects such as flow separation and the resulting vortices.
Simulations, with and without waves, can be made in deep-water, shallow-water and narrow-channel circumstances. In this way, the interaction between the flow and the bottom or channel sides can be properly captured and evaluated. This is particularly interesting for inland shipping, where these effects are most pronounced. CFD calculations provide a powerful tool for hull shape optimization. Problematic areas for the flow can be easily identified, allowing these areas to be tackled at an early stage in the design. Using parametric models, directly connected to the CFD solver, a wide variety of shapes and optimization parameters can be assessed efficiently. Combined with our experience in structural design this results in hydrodynamic efficient and easy to construct shapes. Furthermore, the effect and optimum location of appendages can be assessed. For vessels in service, trim optimization calculations can be made, maximizing their performance.
Propulsors can be taken into account in the simulation using actuator disk theory, providing an accurate representation of the flow into and out of the propulsor. This offers insight towards the wake field of the propulsor, as well as early identification of potential problems for the propulsor inflow. For all CFD analyses which are performed within DEKC Maritime, a complete report will be delivered containing a description of the applied methods, an overview of the input data and detailed results. This includes the possibility of 3D pdf files and animations of the flow field around the geometry.