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Harvard-Smithsonian CfA
Office: P-202
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Computational Fluid Dynamics on a Moving Mesh

We have extended the finite-volume scheme of AREPO to include viscous fluxes. The flexibility of the moving-mesh approach is ideal for transient or impulsively-started viscous flows around solid surfaces (e.g. flow past a cylinder, below).

In Voronoi-tessellation codes, solid surfaces can be elegantly defined by two sets of paired-up mesh-generating points located on both sides of, and equidistant to the boundary. This boundary is defined by the collection of faces that separate both sets of Voronoi cells. We can impose no-slip boundary conditions at each face:

Since AREPO is moving-mesh code, boundaries can also move!
Click here to see a movie of an impulsively-started two-dimensional circular Couette flow. AREPO does a great job reproducing the time-dependent analytic solution.

   Related Publications:

Muņoz, D.J., Springel, V., Marcus, R., Vogelsberger, M. & Hernquist, L. "Multi-Dimensional Compressible Viscous on a Moving Voronoi Mesh"
MNRAS (2012), Submitted.