Roy's right, we do this to post process surface data for fluids computations. 
These values don't need to be coupled to the interior field, or do they?  We 
just usually solve a projection. 

> On Mar 27, 2014, at 5:16 PM, "Roy Stogner" <royst...@ices.utexas.edu> wrote:
> 
> 
>> On Thu, 27 Mar 2014, Derek Gaston wrote:
>> 
>> Is this the place to use BoundaryMesh?
> 
> That's what we do, yeah.
> 
>> Can you get the normals for the elements when you're on a
>> BoundaryMesh?
> 
> Not directly, but you can get_dxyzdxi()/get_dxyzdeta(), and take the
> cross product of those two for the normal.  You could alternatively
> get the interior_parent() of the boundary element and get the normals
> from that.
> ---
> Roy
> 
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