Re: [vmtk-users] FDNEUT meshing using vmtk

[Elaine T. <ela...@ga...>]

Hey Luca,

Thanks for your reply. Yes I understand we are dealing with an antique
here.. :)
We are not using FIDAP solver, but we have an in-house code that
specifically handle .FDNEUT mesh. Especially it reads the mesh based on the
entity groups as sorted out in FDNEUT.(e.g. inlet/outlet boundary). Of
course one possible long-term solution is to change our source code to
accommodate more popular mesh type nowadays. But we have already been
working with .FDNEUT for quite a number of cases. So we want to see if vmtk
can help us with that, without the use of GAMBIT (since it is also quite
old too).

And I am guessing to extend that, rewriting some part of
"vtkvmtkFDNEUTWriter" will do?

Thanks!



On 20 June 2013 16:35, Luca Antiga <luc...@or...> wrote:

> Hello Elaine,
>  your message made me realize I haven't dealt with the FIDAP format
> in a long time! FIDAP was the first CFD solver I've ever used...
>
> Which brings me to the unfortunate consequence: the FDNEUT writer was
> written in the early days when there was no concept of CellEntityIds array
> in
> vmtkmeshwriter. So, while the writer produces a valid FDNEUT mesh, it
> doesn't
> take into account the entity information.
>
> It shouldn't be hard to extend the writer with the FDNEUT specs at hand.
>
> May I ask why you need the mesh in FDNEUT format? If it's not for using
> the FIDAP solver (which must have been abandoned for about ten years
> now) but for importing into, say, Gambit, then there might be other ways
> of getting there, through other formats that VTK supports.
>
> Best,
>
> Luca
>
>
>
>
> On Jun 18, 2013, at 10:37 PM, Elaine Tang wrote:
>
> > Hi,
> >
> > I am trying to create FDNEUT mesh using vmtk, and using .stl as input. I
> want to specify each inlet/outlet as separate entity in the FDNEUT. I first
> created an stl with open caps.Then I import the stl and mesh it to vtu.
> From vmtkmeshboundaryinspector, it seems that my vtu mesh contains the
> surface and each inlet/outlet cap as separate entities, which is great.
> However, when I try to output the mesh in FDNEUT, the CellEntityIfd cannot
> be stored in the FDNEUT mesh. And in the FDNEUT, the mesh is one entity as
> a whole.  Any insight on this?
> >
> > Thanks!
> > --
> > Elaine Tang
> >
> > PhD Candidate
> > Cardiovascular Fluid Mechanics Laboratory
> > Chemical & Biomolecular Engineering
> > Georgia Institute of Technology
> >
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-- 
Elaine Tang

PhD Candidate
Cardiovascular Fluid Mechanics Laboratory
Chemical & Biomolecular Engineering
Georgia Institute of Technology