Project
Soft Sphere Falling
Simulation of a soft deformable sphere falling in fluid showing the deformation and wake dynamics.
1 Challenge
Simulation of the fluid/structure interaction that dominates the dynamics of these flows poses a formidable challenge to even the most advanced numerical techniques, and is currently at the forefront of ongoing work in computational fluid dynamics. A major challenge in the implementation of any non-boundary conforming methodology is the establishment of the relation between the Lagrangian coordinates of the body and the underlying Eulerian grid and the imposition of boundary conditions.
Understanding the deformation of soft objects falling in fluid under gravity.
2 CFD Approach
A soft sphere falling in water under gravity was simulated. Non-reflecting boundary conditions were used on all sides of the computational region.
3 Results
The originally spherical solid body assumes a kidney-bean shape with a pronounced concave arch along the bottom.
4 Engineering Conclusion
The pressure contours are considerably altered relative to a rigid sphere, leading to higher pressure difference between front and back.
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