Versions Compared

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

This course is focused in exploring the advanced meshing features present in GiD. It is recommended to follow the basic meshing course before this one.

...

Switch layer vol on again.
Select Boundary layer --> 3D --> Assign in the Mesh menu, and select the volume of the model. Then click Escape, and the Boundary Layer Mesh window should appear:


  • Fill the parameters with the values shown in the figure: 0.0003 as first layer height, and Number of layers equal to 3. Press Assign button, and select the surfaces in layer mirror. Then click ESCAPE, click on the Finish button and close the Boundary Layer Mesh window.


    As it can be seen, in the Boundary Layer Mesh window a schematic distribution of the stretching of layers of the boundary layer mesh is shown considering the parameters entered. User can change the stretching function and the growing factor in the corresponding part of the Meshing --> Boundary layer branch of the Preferences window. In this example we will use the default parameters .

Image Modified
View of the boundary layer mesh window

Generate the mesh (<Ctrl>-g) with general size equal to 0.0175, and using the meshing parameters from the model (check the corresponding checkbox in the window appearing when selecting generate mesh).

...

In this section, some options of the embedded mesher are shown. The model gid_embedded_example_lamborgini.gid is used in this course, which is a geometrical model of a car inside a control volume, as shown in the following figure:

Image Modified

View of the model used in this course.

This embedded model consists in a prismatic volume (the calculation volume), and the embedded region formed by the surfaces defining the car. Note that the embedded region must enclose a part of the space, but it is not needed to be watertight. As it can be seen in the following figure, some of the higher entities of the lines of the car are not 2 (which is the condition to be watertight):

Image Modified

Higher entities of the lines belonging to the surfaces defining the car.

First of all, select the Embedded mesh type in the Meshing --> General branch of the preferences window, and a size transition factor of 1. in order to be faster generating the mesh.

Then, generate the mesh of the model (Mesh --> Generate), using a general mesh size of 20. The following mesh should be generated:

Image Modified

View of the mesh generated

...