4. Choosing the post-treatment location#
4.1. OPERATION = “EXTRACTION” or “MOYENNE”#
4.1.1. Syntax#
♦ GROUP_NO = lgrno, [l_gr_node]
◊/TOUT = “OUI”, /GROUP_MA = lgrma, [l_gr_mesh]
4.1.2. Operands GROUP_NO/TOUT/GROUP_MA#
The argument for GROUP_NO is a list of node groups. Nodes are processed in the order provided by the user. To reorder the nodes in a list, use the command DEFI_GROUP/OPTION =” NOEUD_ORDO “[U4.22.01]
The GROUP_MA keyword allows you to limit post-processing to a list of mesh groups.
TOUT = “OUI” comes back to the standard case (we consider all the meshes). These keywords can only be used with GROUP_NO.
Notes:
It is not recommended to use GROUP_MAavec the MOYENNEsauf operation if the elements are segments. Recall that the operation MOYENNEcalcule of quantities following a length L. For more information, refer to the paragraph dedicated to the OPERATIONoù keyword. The quantities calculated using this option are presented.
The keyword TOUT =” OUI “means « all mesh cells » Nodal elements assigned directly to the mesh nodes ( AFFE_MODELE/NOEUD ), which are otherwise not recommended, are ignored from post-processing.
4.1.3. Notions of post-processing points and examples#
Post-processing points are the points in \(\Omega\) where components (or derived quantities) are evaluated. The extraction operation performs this evaluation.
4.1.4. Example of post-processing points specified by the GROUP_NO keyword#
Figure 4.3.3-a
This figure shows a post-processing location built from a list of nodes.
The post-processing points are the nodes represented, the post-processing location is the broken line connecting them in the order provided by the user, which makes it possible to define a curvilinear abscissa. The value extracted on these lines is interpolated linearly between the values recorded on the nodes. Thus, it should be noted that if the post-processing operation is an average calculation, everything happens as if the segment \(\mathrm{[}{N}_{\mathrm{47 }}{N}_{61}\mathrm{]}\) were entirely contained in \(\Omega\) .
In this case, the curvilinear abscissa is calculated from the path of the nodes, as defined in the node list.
4.2. OPERATION = “EXTREMA” or “MOYENNE_ARITH”#
4.2.1. Syntax#
4.2.2. Operands TOUT/GROUP_NO/GROUP_MA#
The argument for GROUP_NO is a list of node groups. The knots are not ordered.
The GROUP_MA keyword allows you to limit post-processing to a list of mesh groups.
TOUT = “OUI” comes back to the standard case (we consider all the meshes).