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Unlike the other motion types linear , angular , combined , etc. This is the most flexible of the motion types, and can be used to simulate unconstrained or partially constrained movement of objects within an active flow field. Free-Motion is always flow driven, and is defined by enabling or disabling any of the six degrees of freedom. Limits can be defined for each degree of freedom, but collisions with walls, static and other moving solids are automatically detected. Forces can be applied to objects in free motion as well as gravity.

Objects in free motion cannot pass through other solids, walls, symmetry or surfaces with periodic conditions. They can, however, pass through openings such as fluid boundaries with specified velocities, flow rates, or pressure conditions. Meshing Considerations. Care should be taken when defining the mesh for free motion analyses. For the constrained motion types, the path of the object is known, and the mesh can be refined within that path.

This often reduces the mesh requirements on other areas of the model that do not directly influence the motion. In a free motion analysis, however, the path is often less certain, so a higher mesh density may be required throughout more of the model in order to adequately resolve the motion of the object. Meshing Considerations Care should be taken when defining the mesh for free motion analyses.

Parent topic: Motion.

 
 

 

Autodesk cfd 2019 free

 
Click here for more about simulating Free Surface flows. Dual monitor support is now available. If you do not specify a value for results Save Intervals, you will only be able to see the last time step in the simulation.