CGNS File Import: Stress Analysis with Imported Fluid Loads

Simcenter STAR-CCM+ allows you to import external mesh and solution data in the form of a CGNS file. You can apply the solution data stored in the CGNS file to regions or boundaries within Simcenter STAR-CCM+.

In this tutorial, you model the stresses on the hull of a boat due to the loads exerted by the contacting fluid. The flow solution is not part of the tutorial; the fluid loads are the result of a seperate Simcenter STAR-CCM+ simulation, which models the boat using the DFBI model and records the fluid pressure on the hull in a series of CGNS files.

To compute the stresses on the hull, you import the prerecorded fluid loads from the CGNS files and apply them to the solid hull. The imported CGNS files are a subset of the fluid loads recorded in the transient fluid simulation. The subset contains data between 10.2 and 12.1 seconds.

In the solid stress simulation, the solid region that represents the hull is constrained along the interfaces between the hull and the frame. Assuming the frame to be rigid, you can model the interfaces between the hull and frame as fixed. Naturally, this results in stress concentrations near the fixed interfaces, the severity of which depends on the applied pressure.

As the geometry is symmetric, you only model half of the boat hull.

You run the simulation as transient over a time interval of one second. At each time-step, Simcenter STAR-CCM+ imports data from the CGNS files and solves for the solid displacement and stress.