Easy,accurate simulation of fluid induced motion in six degrees of freedom
Dynamic Fluid-Body Interaction refers to the interaction between a body and the fluid flow surrounding it and the resulting body motion due to external and flow-induced forces.
  • 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.
  • Hypersonic separation of a launch vehicle.
  • Overset Mesh on a Missile
  • Dynamic Fluid Body Interaction (DFBI) of a Missile.
  • Realizing the Benefits of Overset Mesh in Aerospace and Defense
    Overset Mesh technology (or Chimera Mesh, if you prefer) has been around for decades but has primarily stayed in a small, niche aerodynamics community. Although powerful in their own right, overset mesh tools to date have been purpose-built for specific applications and, let’s face it, a bit tricky to use. A live demonstration shows the entire Overset Mesh CFD analysis process – including geometry preparation, meshing, solving and post-processing. We...
  • Overset Grids Technology in STAR-CCM+: Current State & Future Developments
    In this presentation the overset grids methodology implemented in STAR-CCM+ will be first described, including its distinct features compared to similar approaches known from literature (like applicability to arbitrary polyhedral grids and implicit coupling of all grids). Next the access to this feature through the user interface will be explained. The advantages of overset grids compared to alternative approaches when performing parametric studies or...
  • Simulating Motion with Ease Using Overset Mesh
    Many real engineering applications which have not traditionally benefited from simulation in the past involve complex relative, interlocking motions that cannot be modeled by the simple rotational or translational models that are common in simulation software. This presents a headache to remeshing and morphing techniques. Overset mesh represents a paradigm shift in motion modeling that allows motion, however complex, to be easily simulated, be that a full...
  • Overset Mesh is one of the coolest technologies in STAR-CCM+ as it allows objects to move around your computational domain freely without tying your mesh in knots, be that an overtaking car, an excavator arm, or the complex multiple motions involved in a production line. The motion does not even have to be prescribed, 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...
  • Presented at the Aerospace, Defense and Marine Conference 2010

The ability to simulate Dynamic Fluid-Body Interaction (DFBI) is a key capability in any simulation package that has benefits in a wide variety of applications and industries.

Unlike traditional simulations where the body is given a prescribed motion, the DFBI model enables engineers to easily simulate the fluid induced movement of a body, for everything from aircraft store separation to a tanker listing under heavy seas.

The driving force behind DFBI simulations in STAR-CCM+ is the Coupled 6-Degrees of Freedom (6-DOF) solver that computes the fluid forces and moments and gravitational forces on a body experiencing fluid-induced motion.

The 6-DOF solver can be used in conjunction with moving or overset mesh. It allows the computational domain to move in any of the six possible translational or rotational degrees of freedom, allowing the numerical simulation of rigid body motion in a fully-coupled manner with the flow solver. The solver also enables multi-body interactions through body-body linear and catenary couplings, in addition to prescription of external forces on the body. Some key application areas of coupled 6-DOF motion are:

  • Store/stage separation
  • Missile silo launch
  • Sea-keeping
  • Life boat launching
  • Free-falling objects in air/water
  • Floating bodies in water
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