I got this to work!!! 

The error was that I was not using a serialized vector to initialize the mesh 
function. So, even though the point locator was finding the elem, the mesh 
function was setting it to null due to the vector not being serial.  

Now that this is working, I will try to get my other routines to work around 
the mesh function class. 

Still, if others could quickly poll in their preferred method for such multi 
physics computations (DTK, mesh function, etc.), that would give me a healthy 
perspective on this challenging problem. 

I am gradually moving towards wing/aerodynamicz type of FSI problems with 
non-matching boundary interfaces due to beam/plate representations of wing 
structural models and detailed OML representations for the fluid side. mesh 
function would not work there, since there is no overlap of geometry. I had 
brief discussions with DTK developers, and they have identified this as an area 
of interest, which is currently not supported. 

So, if someone on this list is already solving such problems, I am curious to 
learn about this solution transfer methodology. 

Any comments would help!

Thanks!
Manav


> On Aug 11, 2016, at 4:05 PM, Roy Stogner <royst...@ices.utexas.edu> wrote:
> 
> 
> On Thu, 11 Aug 2016, Manav Bhatia wrote:
> 
>> However, the point locator does not seem to work with the ghost elements.
> 
> This sounds like a bug, IMHO.  The point locator *ought* to find any
> ghost element accessible, whether it's retained by the library or by
> user request.
> 
> I can't guess what the bug might be, whether it's a user or a library
> bug, though.  You're requesting active elements when telling libMesh
> which to ghost, right?
> 
> Could you post a simple code that replicates the problem?
> ---
> Roy


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