![]() bottom, is defined in mesh file of constant/polyMesh/boundary (see Fig. Internal field ( internalField) can be set as uniform (just like line 10 in Listing 4.6) or non-uniform (see Section 4.3).īoundary conditions ( boundaryField). See the manuscript(Guo, Ruepke & Tao, 2020) for variable type and object name index. Variable type ( class) and object name ( object). faces is a list of block faces that make up the patch with a user defined name (see lines 43-46 for right patch or lines 67-71 for frontAndBack patch shown as transparent surface in Fig. The type is typically set to patch or empty for a non-computing boundary patch of a non-three-dimensional case. There are two key entries, type and faces in each sub-dictionary. ![]() right or whatever the user like) of the sub-dictionary is the boundary patch name which will be used in filed data (see Section 3.1.2). simpleGrading is typically set to (1 1 1), see OpenFOAM user gide- blockMesh for more details.īoundary contains sub-dictionarys for defining boundary patches. (100 50 1) means the number of cells in \(x\), \(y\) and \(z\) direction will be 100, 50 and 1 (for 2D case), respectively. The order of vertex connection is (0 1 2 3 4 5 6 7). 4.1.īlocks contains vertex connection of a hexahedron, numbers of cells in each direction and cell expansion ratios. vertex 0 is (0 $ymin 0) and the vertex 5 is ($Lx $ymin $Lz), the coordinate system is shown in Fig. Vertices contains all three-dimension coordinate of each vertex (line 15-25), e.g. The key entries are vertices, blocks and boundary. ¶Īn example of blockMeshDict for describing a 2D box is shown in Listing 4.1. 4.1 The coordinate system and vertices numbering of single block for blockMesh. Remembering that OpenFOAM always uses the C++ convention that the first element of the list has label ‘0’.įig. The vertices are written in a list so that each vertex can be accessed using its label, 4.5).īlockMesh decomposes the domain geometry into a set of 1 or more three dimensional, hexahedral blocks.Įach block of the geometry is defined by 8 vertices, one at each corner of a hexahedron.Īn simple example block and vertices numbering is shown in Fig. blockMesh reads this dictionary, generates the mesh and writes out the mesh dataĬells and boundary files in the constant/polyMesh directory (see Fig. The mesh is generated from a dictionary file named blockMeshDict located in the system directory of a case. This section we simply present how to use blockMesh and gmshToFoam for generating mesh and defining boundary patches. See OpenFOAM user guide- mesh generation and conversion for details. SnappyHexMesh application for meshing complex geometries andĪpplications that convert meshes from well known formats into the OpenFOAM format, e.g. The are several ways to generat mesh, including OpenFOAM’s built-in blockMesh application for generating meshes of simple geometries, The basic usage of HydrothermalFoam are shown as below. See OpenFOAM user guide for more details. At bottom left of GMSH’s windows, camera can be reseted using X,Y,Z and 1:1 (scale) buttons.Usage of HydrothermalFoam tool is similar to any other solver of OpenFOAM, The camera can be adjusted using the mouse: rotating ( left click), translating ( right click) or zooming ( wheel). In GMSH, go to files->open ( CTRL+o) and open the file, or type gmsh square.geo in a terminal (warning: this open a new instance of GMSH (which is very light by the way!)).Ī square should have appear in GMSH’s windows. ![]() Point(1) = // Setting a label to the Surface ![]() square.geo: h = 1 // Characteristic length of a mesh element Copy/paste the following code in a new file, named e.g.
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