fe_gmsh then outputs the model processed by gmsh, which is usually written in. All characters in the command after -run will be passed to the gmsh batch call performed.
Command option -run allows to run gmsh on the written file for meshing. stl writing format is also supported, by using extension. Command option -spline can be used (when lines have been declared using command AddLine3 from beam3 elements) to write spline objects instead of line objects in the. 
Command option -keepContour can be used to force gmsh not to add nodes in declared line objects ( Transfinite Line feature).The default behavior will define a single Plane Surface combining all contours, while -multiple variant will declare each contour as a single Plane Surface. Command option -multiple can be used for automated meshing of several closed contours.You can also define a nodewise characteristic length by setting non zero values in model.Node(:,4). geo file which root name is specified as FileName (if you use del.geo the file is deleted on exit).Ĭommand option -lc allows specifying a characteristic length. Elt) and geometry data in model.Stack'info', 'GMSH' into a.
Writeįe_gmsh( 'write FileName.geo',model) writes a model (. Readįe_gmsh( 'read FileName.msh') reads a mesh from the GMSH output format. This command also provides a good test to check your gmsh setup as the output will be empty if gmsh could not be found. Setpref( 'OpenFEM', 'gmsh', '$HOME_GMSH/gmsh.exe')Ĭommand Ver returns the version of gmsh, the version is transformed into a double to simplify hierarchy handling ( e.g. The fe_gmsh function uses the OpenFEM preference to launch the GMSH mesher.
For this command to work, beam3 elements must be used, so that a middle node exists to be declared as the spline control point.įor this command, data can only be an element string selection.
AddLine3 can be used to declare splines instead of lines in the geometry. This feature is only supported for lines specified as selections. Mdl= fe_gmsh( 'AddLine',mdl,data, 'embed',1) will thus declare the edges found in data not as line loops defining surfaces, but as interior mesh constrains. It is possible to define line constrains in mesh interiors using embedded lines (depending on the gmsh version). Mdl= fe_gmsh( 'AddLine',mdl,data, 'seed',5) will ask gmsh to place 5 nodes on each line declared in data. It is possible to specify a seeding on the line for further meshing operation using additional arguments seed and the number of nodes to seed on the line. data can be a 2 column matrix which each row defines a couple of points from their NodeId.ĭata can also be a 2 by 3 matrix defining the coordinates of the 2 extremities.ĭata can also be a string defining a line selection. 2nd row defines the 1st edge node coordinates and third row the 2nd edge node coordinate. at the second edge node with the option -tangent2). with a -tangent1 option, 3x3 matrix whose 1st row defines a tangent vector of the circle arc at the 1st edge node (resp. 3x1 vector, giving the 3 NodeId (center, 1st and 2nd edge) as a column instead of x y z. CircleArc defines a circle arc using dataģx3 matrix, with 1rst row giving center coordinates, second and third rows are respectively the first and second edges defined by node coordinates. One can also define LineLoop from circle arcs (or mixed arcs and lines) using a cell array whose each row describes a lineloop as where indi are the row indices of the 4 arcs of circle created in. Rows define a closed line as combination of elementary lines. To allow automated running of GMSH from MATLAB, this function uses a info,GMSH stack entry with the following fields Model= fe_gmsh( 'AddFullCircle -loop2',model,) Model= fe_gmsh( 'addline -loop1',model,) This other example makes a circular hole in a plate Model= fe_gmsh( 'addline',model, 'groupall') Model.Node= feutil( 'getnode groupall',model) Model.Elt= feutil( 'selelt seledge ',model) This example illustrates the automatic meshing of a plateįEnode = įemesh( 'objectholeinplate 1 2 3. The main operation is the automatic meshing of surfaces. Model= fe_gmsh( 'write -run', 'FileName.stl') Setpref( 'OpenFEM', 'gmsh', '/path_to_binary/gmsh.exe') % Config #Does gmsh have a command line interface download
You can download GMSH at and tell where to find GMSH using
0 kommentar(er)
