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Re: [ff3d-users] How to read external mesh in input file

From: Stephane Del Pino
Subject: Re: [ff3d-users] How to read external mesh in input file
Date: Sun, 8 Feb 2004 19:52:49 +0100
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On Saturday 07 February 2004 21:21, Robert Li wrote:
> Dear Stephane Del Pino,
>   I met new problems with ff3d.
> 1. Does FEM only use one box(n,a,b) as mesh?
No. You can also read a mesh from a file. But if you use an Hexahedra mesh, 
you will not have access to interpolation --- this is not implemented and I 
do not know how to do it ... So use meshes of tetrahedra for real FEM.

Note also that using a load mesh will not allow you to use FDM methods: up to 
now they are only implemented for Cartesian meshes!

> 2. Can we use different mesh size in different layers?
> for example:
> small size mesh: 0<z<2
> big size mesh: 2<z<4
As I saied previously, no.

> 3. How to read external mesh file? Does it work now?
>  I used a mesh, which was created by ff3d itself.
> The error output is as follows:
> Discretizing Boundary Conditions
> ./solver\BoundaryConditionCommonFEMDiscretization.hpp:85:
> Oops!
> The mesh of boundary Surface Mesh was not generated
The reason is that since you loaded the mesh using a file, ff3d does not know 
if the mesh is cartesian or not ... It then assumes it is not and some 
functionalities in this later case are not implemented ... And I have no idea 
when they will be.

It think the best for you is to generate a tetrahedra mesh by yourself in a 
file and then use it in ff3d --- maybe look at the package 'tetgen'.

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