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We present results of a large, high resolution 3D hydrodynamical simulationof the surface layers of a DA white dwarf (WD) with $T_{\rm eff}=11800$ K and$\log(g)=8$ using the ANTARES code, the widest and deepest such simulation todate. Our simulations are in good agreement with previous calculations in theSchwarzschild-unstable region and in the overshooting region immediatelybeneath it. Farther below, in the wave-dominated region, we find that the rmshorizontal velocities decay with depth more rapidly than the vertical ones.Since mixing requires both vertical and horizontal displacements, this couldhave consequences for the size of the region that is well mixed by convection,if this trend is found to hold for deeper layers. We discuss how the size ofthe mixed region affects the calculated settling times and inferredsteady-state accretion rates for WDs with metals observed in their atmospheres.

Mixing and Overshooting in Surface Convection Zones of DA White Dwarfs: First Results from ANTARES