CFD Online Discussion Forums - [gmsh] How to create a 3D volume mesh using a existing surface mesh?!

Dear all,

i try to create a 3D volume mesh above a preexisting surface mesh for the later use in an OpenFOAM simulation. I've generate a .stl file containing my topography and used the gmsh "Reclassify 2D" command to create a suitable .msh file. I merge this new .msh file in gmsh and create the outline of my domain above this mesh. To do this i use the following code:

Code:

Mesh.RemeshAlgorithm=1;

Mesh.CharacteristicLengthFactor=1.00;//0.05;

Merge "cube.msh";

//RefineMesh;

CreateTopology;



lc = 1;



// ++++++++++++++++++++++++++++++++++++++++

// +++++++++ Box above topography +++++++++

// ++++++++++++++++++++++++++++++++++++++++

Point(14) = {29, 20, 2, lc};

Point(15) = {29, 24, 2, lc} ;

Point(16) = {31, 24, 2, lc} ;

Point(17) = {31, 20, 2, lc} ;



Line(40) = {7, 17};

Line(41) = {2, 14};

Line(42) = {1, 15};

Line(43) = {5, 16};

Line(44) = {16, 15};

Line(45) = {15, 14};

Line(46) = {14, 17};

Line(47) = {17, 16};

Line(48) = {5, 1};

Line(49) = {2, 1};

Line(50) = {2, 7};

Line(51) = {7, 5};



Line Loop(2) = {45, 46, 47, 44};

Plane Surface(11) = {2};

Line Loop(3) = {46, -40, -50, 41};

Plane Surface(12) = {3};

Line Loop(4) = {47, -43, -51, 40};

Plane Surface(13) = {4};

Line Loop(5) = {44, -42, -48, 43};

Plane Surface(14) = {5};

Line Loop(7) = {42, 45, -41, 49};

Plane Surface(16) = {7};



Physical Surface("Inlet") = {12};

Physical Surface("Outlet") = {14};

Physical Surface("Front") = {13};

Physical Surface("Back") = {16};

Physical Surface("Top") = {11};

Physical Surface("Surface") = {2};

The result is depicted in the following image.

https://www.dropbox.com/s/3hlsarzvfw...%3A57%3A56.png http://imgur.com/a/6oGqR http://imgur.com/a/6oGqR http://i.imgur.com/5gY91OA.png
As you can see i'm able to create (physical) surfaces defining my domain above my surface, which itself is defined as a physical surface.

Problem: I'm unable to create a meshed representation of what i've got so far. Can anybody suggest a solution for my problem?

With kind regards
Robert
https://www.dropbox.com/s/3hlsarzvfw...%3A57%3A56.png