Now that the model is finished, it is ready to be meshed. The mesh will be
generated using Chordal Error in order to achieve greater accuracy in
the discretization of the geometry. The chordal error is the distance between
the element generated by the meshing process and the real profile of the model.
By selecting a sufficiently small chordal error, the elements will be smaller
in the zones with greater curvature.
Generating the mesh using Chordal Error
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Choose the option Mesh
Unstructured
Sizes
by Chordal error .
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Enter 1 for the minimum element size.
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Enter 15 for the maximum element size.
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Enter 0.2 for the chordal error.
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Choose Mesh
Generate mesh .
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A window opens in which to enter the maximum element size of the mesh to be
generated. Leave the default value provided by GiD unaltered and click OK
.
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When the meshing process is finished, a window appears with information about
the mesh that has been generated. Click OK to visualize the mesh.
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Choose Mesh
View Mesh Boundary to
see only the contour of the volumes meshed but not the interiors.
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The visualization may be rendered using the various options in the Render
menu, located in the mouse menu.
NOTE : By default GiD corrects element size depending on the form of the
entity to mesh. This correction option may be deactivated or reactivated in the Meshing
card in the Preferences window under the option Automatic correct sizes
.
Figure 31. The
mesh generated for the piece
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Generating the mesh by assignment of sizes on surfaces
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Choose Mesh
Unstructured
Assign
sizes on surfaces . A window opens in which to enter the element size
for the surfaces to be selected. Enter size 1.
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Select the surfaces of the elbow.
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Choose Mesh
Generate mesh .
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A window appears asking whether the previous mesh should be eliminated. Click Ok
.
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Another window appears in which the maximum element size should be entered.
Leave the default value provided by GiD unaltered and click OK .
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Choose Mesh
View Mesh Boundary to
see only the contour of the meshed volumes but not the interiors (Figure 32).
Figure 32. The
mesh with a concentration of elements on the surfaces of the elbow
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A greater concentration of elements has been achieved on the selected surfaces.