Feature 3 | CAD/CAM CD-Adapco simulates reality
CD-Adapco has launched the latest version of its soſtware v9.06 which has focused on creating more accurate simulations that are closer to the final product during development
T
o create better simulation CD-Adapco has taken in factors that are likely to significantly
influence the performance of a design in operation. A new acoustic wave equation solver has been added that accurately predicts the propagation of an acoustic signal from the flow field, making its capture more accurate. By using the MUSCL convection scheme it provides a higher accuracy in applications like shock waves, wakes, vortices and propagating sound waves by minimising the numerical dissipation. One of the main points of creating
a good simulation is the realism of it. To improve this partial wrapping and extended overset mesh capabilities delivers what CD-Adapco says is a new level of realism in modelling and more detailed systems and sophisticated motions. The partial wrapping allows STAR-CCM+ users to selectively apply the surface wrapper, a core strength product, to regions of the geometry while retaining the complete fidelity of other parts. “The good news is that a new method
introduced to STAR CCM+ v9.06 will allow you to selectively wrap dirty surfaces, while preserving those that are clean. The new partial wrapping feature will allow the user to select portions to the geometry and declare them as clean. When a surface has been declared clean for partial wrapping STAR CCM+ will then wrap the geometry as normal. Once a clean, closed surface is obtained the flagged surfaces are then removed from the wrap and the originals are stitched in their place,” explains James Clement, STAR-CCM+, product manager, CD-Adapco. Adding to this is gap handling as the
overset mesh removes the limitation of efficiently modelling contact between moving bodies and parts. The overset mesh allows objects to move around a
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This unlimited boat simulation leverages partial wrapping to take advantage of clean geometry and only wraps the portions that need it
computational domain freely without over complicating the mesh. “The dynamic fluid body interaction
(DFBI) model allows you to solve for motion, in six degrees of freedom or less, based on the forces and moments acting on a body, such as a boat on a free surface. To date, however, there has been one major constraint when using overset mesh, namely that all gaps had to be resolved with at least 2-4 cells, however small the gap, for overset mesh to work correctly,” David Mann says. “The upcoming release of STAR-CCM+ V9.06 removes that constraint with the introduction of gap handling for overset mesh via the new “zero gap” interface type. Now, you have the option for STAR-CCM to automatically close gaps where the mesh is too coarse for overset mesh to work,” he adds.
Users can now choose to resolve
the flow in small gaps by using a fine mesh, or if too small, they can be closed using a smaller mesh. Overset mesh and discrete element modelling (DEM) can now be combined and used to solve a new range of applications. Other features that have been added
are enhancements to the user workflow which now includes faster setup and a new level of design exploration performance. An interaction tool for the creation of morphed control points that drives mesh deformation and enables adjoint-based shape optimisation cases to be easily setup. Jean-Claude Ercolanelli, VP product
management, CD-Adapco adds: “We are working at complementing the multiple engineering disciplines that are already in STAR-CCM+ with Computational Solid Mechanics capabilities.” NA
The Naval Architect January 2015
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