For the past 30 years, the ability of engineers to perform Computational Fluid Dynamics simulations of the interaction between multiple moving objects has been severely curtailed by the need to generate an interconnected mesh between the objects. Not only did this requirement make the creation of "moving mesh" simulations an intensive manual process, it also often rendered it impossible in the case of objects with extreme ranges of motion or with very close interaction.
The release of STAR-CCM+ v7.02 changes this forever with the introduction of a new Overset Mesh capability. Overset Mesh (sometimes called "overlapping" or "chimera" mesh), allows the user to generate an individual mesh around each moving object which then can be moved at will over a background mesh. The Overset Mesh capability is fully compatible with the full range of unstructured meshing options in STAR-CCM+. With no need to worry about interconnecting meshes or cell distortion, Overset Mesh brings genuine moving object simulation within the grasp of all engineers.
Overset Mesh can also be used for parametric studies, steady or unsteady simulations, providing an easy way to reposition or replace objects in order to study multiple design configurations.
"The term 'paradigm shift' may be overused, but the introduction of Overset Mesh in STAR-CCM+ v7.02 truly offers a new way of carrying out CAE. Overset Mesh revolutionizes the entire analysis workflow while opening a whole new range of application areas to simulation," said Jean-Claude Ercolanelli.
Overset Meshing Revolutionizes Moving Mesh Simulations (click image for larger view)
Indirect Mapped Interfaces
STAR-CCM+ v7.02 also revolutionize the simulation workflow for conjugate heat transfer (CHT) simulation (those in which temperatures are solved for both fluid and solid regions). The new Indirect Mapped Interface allows to using non-conformal meshes between solid and fluid domains. Not only does this reduce the time required to set up a CHT simulation, but it also has the potential to greatly increase the accuracy of the simulation results by allowing the user to specify the most appropriate mesh for each region without worrying about making them conformal at the interface.
The Solution History is an entirely new feature of STAR-CCM+ v7.02, allowing engineers to review and explore the analysis results space by providing a complete history of a simulation, both in terms of changing results and changing design configuration. For the first time, engineers can record, store, compare, and visualize results from any analysis type. Results from multiple simulations may be recorded in a single simulation history file and easily replayed. Since the user can choose exactly which data is stored for each configuration or time-step, all this can be achieved without a large storage overhead.
The Solution History feature also provides a way of comparing multiple design configurations in a single STAR-CCM+ session.
CD-adapco (www.cd-adapco.com) is the world's largest independent CFD focused CAE provider. Our core products are the technology-leading simulation packages, STAR-CCM+ and STAR-CD. The scope of our activities, however, extends well beyond CFD software development to encompass a wide range of CAE engineering services in fluid dynamics, heat transfer and structural engineering. Our ongoing mission is to "inspire innovation and reduce costs through the application of engineering simulation software and services."
A privately owned company, CD-adapco has maintained 17% organic year-on-year growth over the last 5 years. CD-adapco employs over 550 talented individuals, working at 21 different offices across the globe.