Motion | CD-adapco
Model unlimited scenarios involving relative motion of components
STAR-CCM+ has a comprehensive set of tools for efficiently modelling motion for any class of problem that you may wish to simulate, be that the relative motion between the parts of a brake assembly, a metro train passing though a subway station, an inflating airbag, or the calculation of the drop trajectory and orientation of a lifeboat.
  • The overset mesh capability allows for a user to easily accommodate complex geometries without needing to worry about the details of cell activation/deactivation or interpolation. Depicted is a plane section showing the outline of an overset mesh on a missile from a Eurofighter.
  • Streamlines on a Harpoon missile : Overset (Chimera) meshing allows bodies to move freely throughout the computational domain without being artificially constrained by the mesh because separate overlapping meshes are used, a background mesh, and a body fitted mesh around the geometry of interest.
  • STAR-CCM+ is widely used to perform heat transfer and conjugate heat transfer simulations, such as the CPU cooling fan analysis shown here. Rigid body motion allows parts to rotate and/or translate with repect to each other, yielding time-accurate flow date that includes the effects of transient interactions between components.
  • Hull with no rudder in fine waves (Image courtesy of KCS Marine) : modeling the motion of a body resulting from the forces and moments on it can be carried out seamlessly within the single integrated environment of STAR-CCM+.
  • Dynamic Fluid Body Interaction (DBFI) simulation of a large cargo ship : modeling the motion of a body resulting from the forces and moments on it can be carried out seamlessly within the single integrated environment of STAR-CCM+.
  • Flexible wing : Use of high fidelity computational aeroelasticity is critical to tomorrow's design challenges, driving innovation and resulting in engineering success. STAR-CCM+, with a direct link to Abaqus FEA for co-simulation, seamlessly integrates computational aeroelasticity into the design process.

Those technologies are:

Moving reference frame

Simplifies the otherwise transient problem of the relative motion of objects into an efficient steady state approximation, reducing run times by orders of magnitude in doing so. When used appropriately the results closely approximate those of far more computationally expensive calculations.

Rigid body motion (sliding mesh):

Allows parts to rotate and/or translate and with respect to each other, yielding time accurate flow data that includes the effects of transient interactions between components.

Mesh morphing

Allows for more complicated arbitrary relative motion by morphing the nodes of the mesh. Mesh morphing can be used to model scenarios where components deform and change shape, and is the basis for Fluid Structure Interaction (FSI) simulations.

Overset

Overset (Chimera) meshing allows bodies to move freely throughout the computational domain without being artificially constrained by the mesh. Separate overlapping meshes are used, a background mesh, and a body fitted mesh around the geometry of interest. The body and fitted mesh are then able to move freely without the need to remesh, and data is interpolated between the two meshes.

Dynamic fluid body interaction (DFBI)

Allows the modelling of motion of a body resulting from the forces and moments on it (both from the fluid and other external forces). It includes at its core a Six Degree of Freedom (6DOF) solver which is used in conjunction with other motion methods such as the mesh morphing and overset methods to allow bodies to move in response to the forces on them. The DFBI model also includes the ability to model external forces from connections such as springs or catenaries, or forces due to contact to prevent DFBI objects passing through adjacent boundaries. There are also a number of option for modeling reduced degrees of freedom for marine tow tank tests such as Four-DOF Maneuvering Motion, General Planar Motion, Planar Motion Mechanism, and Rotating Arm tests.

These models gives the users of STAR-CCM+ the power to model unlimited scenarios involving motion with ease.

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