In the example, we have three sub-meshes with concurrent algorithms, because they have different hypotheses.As we can see, each mesh computation has a different number of result elements and a different mesh discretization on the shared edges (the edges that are shared between Additionally, sub-mesh priority (the order of applied algorithms) can be modified not only in a separate dialog box, but also in the If there are no concurrent sub-meshes under the Mesh object, the user will see the following information. A SALOME study can contain multiple meshes, but they do not implicitly compose one super-mesh, and finally each of them can be used (e.g. All the arrays passed as arguments in the set methods are duplicated in MESHING object.The creation of a mesh should respect the following sequence :The following paragraphs describe the methods that must be called when creating a mesh. It is the Python equivalent of the C++ program# test_MEDMEM_Meshing.cxx in the ../MEDMEM directory of the SALOME distribution#################################################################################### files name to save the generated MESH(ING) in different format# saving of the generated mesh in MED 2.1, 2.2 and VTK format# we build now 8 fields : 4 fields double (integer) :# 2 fields on nodes (cells) : If you close this box and click "Compute" button again, without previously changing meshing parameters, the mesh will NOT be re-computed and the Mesh Computation information box will be shown with the same contents. After selection of an algorithm "Hypothesis" field of the dialog can contain: Proceed in the same way with 2D and 1D Algorithms and Hypotheses that will be used to mesh faces and edges of your geometry. A SALOME study can contain multiple meshes, but they do not implicitly compose one super-mesh, and finally each of them can be used (e.g. If meshing parameters are defined on sub-meshes of the same priority, for example, different 1D hypotheses are assigned to two faces sharing an edge, the hypothesis assigned to a sub-shape with a lower ID will be used forchange Note that some algorithms generate elements of several dimensions, and others of only one. Mesh module provides several ways to create the mesh: The main way is to construct the mesh on the basis of the geometrical shape produced in the Geometry module. Mesh module (SMESH) The goal of this module is to create meshes on the basis of geometrical models created or imported into GEOM. (Note that any object has edges, even if their existence is not apparent, for example, a sphere has 4 edges). Each dimension (volumes – surfaces – edges) has its own meshing algorithm with its own. 1D mesh preview shows nodes computed on geometry edges exported) only individually.Mesh module provides several ways to create the mesh: Meshes can be edited using the MESH functions destined for Every mesh entity has an attribute associating it to a sub-shape it is generated on (if any). 20 - SALOME users day – November 23 2010 Conclusions First “industrial” mesh generated with SALOME for Code_Saturne Most studies use other tools No meshing tool testyed so far is fully satisfactory (i.e. In the latter case there must be one Algorithm and zero or several Hypotheses for each dimension of your object, otherwise you will not get any mesh at all. easy See the GNU# You should have received a copy of the GNU Lesser General Public# License along with this library; if not, write to the Free Software# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA# See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com#################################################################################### This Python script uses the wrapped C++ class MESHING to buid a mesh from only# primitive data like coordinates (Pythoin double array) and connectivity (Python# integer arrays). All verifications are under user responsability : if array values or array dimensions are wrong, results are impredictable. (To fully re-compute the mesh, invoke If the mesh computation has been a success, the box shows information on the number of entities of different types in the mesh.If the failure is caused by an invalid input mesh and the algorithm has found which mesh entities are bad, For example you can generate a 2D mesh, modify it using e.g. Some algorithms do not require any hypotheses. An example illustrates the general procedure.

In your opinion, what are the differences between Saturn and OpenFoam. The main Mesh object: The sub-meshes become concurrent if they share sub-shapes that can be meshed with different algorithms (or different hypotheses). 2. First tutorial I make on the open source CFD code Code_Saturne integrated into SalomeCFD!in today’s video tutorial we’ll talk about Salome CFD.It’s the first video I’m doing about open source fluid dynamics with Salome CFD and Code Saturne, so I hope it will be very interesting!CFD study is the module that uses Code_Saturne in Salome CFD.Well… to install Salome CFD you have  first to download it from its websiteI will start with a very simple flow analysis of a simple 2D channel and the first thing I’ll do is to create the following geometry model:let’s go into the geometry module in which I will build the model that I will use for this tutorialFor the sake of simplicity I will do a 2d analysis but you should know that you need still tohave a 3d model which will have only one layer of mesh in the z directionMy model will be very simple it will have a length of :So now I have a block and I have to think about what I need to do to set up the mesh and and make this model ready for simulationNote that the groups are important as they define the areas where boundary conditions will be applied in Code_SaturneThis function here creates three set of edges which are in each of the directions and I will use those sets later to define the sub mesh and constrain the number of elements of my modelYou can change the name of each group so it’s easier for you after to assign them to the right sub-meshNow that I have that let’s create the groups that I will use to assign the boundary condition of my CFD analysis.Select my geometry and select the shape type as « face »Select the face where the inlet will be applied, click on « Add » and a number which represents the ID of the face will be added to the dialog box.Repeat the same operation to generate 4 groups of faces :Now I will go to create the mesh so let’s jump to the mesh module and activate our geometryThe first thing to do is just to add a new mesh set and then choose « 3D Automatic Hexahedralization » to simplify things a bit.Once you did that, you will have some mesh, but there is still a problem… it will have the same number of elements on all its edges.To specify how many elements you want, you have to use The only thing you have to do is to select one of the edge groups xdir, ydir or zdir and create a submesh which will define the number of elements to be used on that edge during meshing.Z-Direction : 1 element (because we study a 2D CFD problem here)Once you defined all the submeshes, you can compute and get your mesh :Even if we created the geometry groups, we still need to create groups for the meshBecause the solver only look at the mesh… geometry groups are an help to generate mesh groups more easily.Fortunately, there is a function which can do that called « Create Groups from Geometry »This is what you should have in the Object Browser if you did it correctly :let’s go to the next step which is the definition of the parameters of the CFD studyOnce you open the module « CFD study », you have to create a new CFD case and save it.Check « Create Study », choose where you will save it and then enter a study name and a case name, then click on OK.Save the new study and you will see a set of new folders appearing in the object browser :For that, go back in the mesh module, select your mesh and in the menu choose « export in MED format »Go back to the CFD module, unfold the folder DATA from the object browser, right click on the « SaturneGUI » file and choose « Launch GUI »Choose « Save CFD Data File » before doing anything else :When you click on save, you see in the object browser that you have a  new XML file which appeared :Everything you define in the Saturne GUI is also written in XML format into this file.If you are not familiar with XML it’s a bit like HTML format but it allows to define your own tags so it’s used by the GUI interface to dialogue and exchange together the user input data.If I click on mesh selection you see that it automatically opens the folder MESH and now I have to click and add my mesh insideNow we have to go to « thermophysical model » and open « calculation features » where I can define the flow study as « steady-state »I won’t use any turbulence models as this will be a laminar flow so I’ll just set the turbulence model as « No model » :I need to define the properties of the fluid reference value so I’ll put density of 1000 and viscosity of 100Gravity will be null in this case so but remember that if you want to consider the effect of gravity well you have to define it here:I’ll define now the initialization condition for the velocity as 0,0,0(This is just an initialization condition, real velocity is defined on the « inlet » as a boundary condition)Now, let’s define the boundary regions as in the photo below.
Meshing interface Now the mesh setup interface will be opened. To create a mesh on geometry, it is necessary to create a mesh object by choosingMesh generation on the geometry is performed in the bottom-up flow: nodes on vertices are created first, then edges are divided into segments using nodes on vertices; the node of segments are then used to mesh faces; then the nodes of faces are used to mesh solids. It is not necessary to define meshing parameters for all dimensions at once; you can start from 1D meshing parameters only, compute the 1D mesh, then define 2D meshing parameters and compute the 2D mesh (note that 1D mesh will not be re-computed).An algorithm of a certain dimension chosen at mesh creation is applied to discretize every sub-shape of this dimension. In the Mesh menu select Create Mesh or click "Create Mesh" button in the toolbar. there can be a node and element with the same ID.SALOME supports elements of second order, without a central node (quadratic triangle, quadrangle, polygon, tetrahedron, hexahedron, pentahedron and pyramid) and with central nodes (bi-quadratic triangle and quadrangle and tri-quadratic hexahedron). Note that the choice of hypotheses and lower dimension algorithms depends on the higher dimension algorithm.If you wish you can select other algorithms and/or hypotheses for meshing some sub-shapes of your CAD model by Some algorithms generate mesh of several dimensions, while others produce mesh of only one dimension.
exported) only individually. NOTE

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