Sloshing
Industry leading multi-disciplinary solutions to avoid critical damage as a result of sloshing
Ships are being designed with increasingly larger insulated holding tanks to allow for a growing capacity in the marine industry and now more than ever, sloshing and structural integrity of these bigger tanks pose a significant technical challenge to the Marine Industry.
  • Sloshing simulation of an LNG tank courtesy of Lloyd's Register
  • LNG sloshing
    Ships are being designed with increasingly larger insulated holding tanks to allow for a growing capacity in the marine industry and now more than ever, sloshing and structural integrity of these bigger tanks pose a significant technical challenge to the Marine Industry. Shown is LNG sloshing in a tank.

Ships are being designed with increasingly larger tanks to allow for a growing capacity in the Marine Industry and now more then ever, there is a need for accurate prediction of structural loads on the tanks due to sloshing.

CD-adpaco’s solutions for sloshing applications include:

Volume of Fluid (VOF)

The Volume of Fluid (VOF) Multiphase model allows the movement of the interface between the fluid phases to be accurately captured, as is typically required for marine, free-surface flows applications such a sloshing in a tank. The VOF Model in STAR-CCM+® uses an original High-Resolution Interface-Capturing (HRIC) scheme that provides a resolution of the free surface by a single computational cell. It is part of the multi-component, multiphase framework in STAR-CCM+® that allows users to consider multiple fluids (such as water, oil and air) and account for phase change (e.g. cavitation and evaporation at the free surface). Both liquid and gaseous phases can be compressible.

Fluid-Structure Interaction (FSI)

STAR-CCM+® has a direct link to Abaqus FEA through co-simulation, delivering fully coupled, two-way, fluid-structure interaction. STAR-CCM+® co-simulation gives users the flexibility to choose between explicit and implicit coupling, depending on the application. In addition to direct co-simulation, STAR-CCM+® also enables FSI computations through importing/exporting meshes in other native formats (e.g. Nastran/Ansys) as it leverages the power of JAVA and gives users the ability to customize every step of the work flow.

The built-in mapping implemented in STAR-CCM+® is robust and accurate and efficiently handles non-conformal meshes with no need for writing scripts or input files. A multi-quadratic morphing capability robustly and smoothly moves the meshes (of any topology) based on the deformation it receives from the structures solver. The resulting mesh conforms to the shape of the deflected structure and the redistribution of the mesh vertices nicely preserves the quality of the original mesh. In addition to mesh morphing, STAR-CCM+ also has an overset mesh capability.

Using the FSI capability in conjunction with STAR-CCM+®'s unrivaled meshing technologies, high-fidelity multi-physics and intuitive user environment results in an FSI capability that is flexible, accurate, robust and efficient

Dynamic Fluid-Body Interaction (DFBI)

DBFI allows for the coupled computation of flow and motion of floating bodies in 6 DoF, including fluid, propulsion and external forces and moments. This can be seamlessly carried out within the single integrated environment of STAR-CCM+®. Additionally, superposition of multiple motions allows users to simulate more complex body part motions and combine various grid adaptation options (e.g. rigid body motion, mesh morphing and overlapping grids).

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