Next: The EDIT_MESH application
Up: The EMC˛
preprocessor
Prev: 1.5.3 The construction application
Index
Contents
This application is controlled by the application menu on top of the screen (figure 1.26) and the selection menu on bottom of the screen (figure 1.19). It is used to define:
Furthermore, at this point, we have the option of interfacing with the APNOPO mesh generator by generating a data file for the APNOXX preprocessor, see secapnopo.
Figure: The PREP_MESH application menu
When we enter this application, the program automatically calculates all the interior and exterior connex components of the design, for example figure 1.27. The interior connex components are oriented counterclockwise and the exterior connex components are oriented clockwise.
Figure 1.27: Example of components
We thus obtain automatically the following connex components:
P5,P3,P4 >0 P1,P3,P5 >0 P1,P2,P3 >0 P1,P5,P4,P3,P2 <0
We will call <state modif> a modification of the state of the system, which is to say a modification of the value assigned to one of the variables.
<state modif> = *( <ratio> | <nb interval> | <lg interval> | <ref number> )
Nb_INTERVAL * <VALUE> * ( LINE *(( <VALUE> | ")<element1> <element2>) | COMPONENT *(( <VALUE> | ")<element3>) | ALL | ( <VALUE> | ")<element4> )This command is used to generate intermediate points on
Lg_INTERVAL *<VALUE> * ( LINE *(( <VALUE> | ")<element1> <element2>) | COMPONENT *(( <VALUE> | ")<element3>) | ALL | ( <VALUE> | ")<element4> )This command is used to generate intermediate points on
RATIO * <VALUE> * ( LINE *(( <VALUE> | ")<element1> <element2>) | COMPONENT *(( <VALUE> | ")<element3>) | ALL | ( <VALUE> | ")<element4> )
This command is used to assign %RATIO as ratio to
NODE_REF * <VALUE> * ( LINE *(( <VALUE> | ")<element1> <element2>) | COMPONENT *(( <VALUE> | ")<element3>) | DOMAIN *(( <VALUE> | ")<element4>) | ALL | ( <VALUE> | ")<element5> )This command is used to assign %NUREF as reference number to
If VALUE is entered, %NUREF takes this value and it is displayed on
the bottom line of the screen.
If the selected elements are cracks, VALUE will be assigned to the extremity and on the side where the element, the LINE or the COMPONENT was clicked, and by continuity to the extremities of the adjacent elements. In effect, a crack element possesses a line reference number and two extremity reference numbers on its left and/or on its right. These numbers can be identical or different. If they are different, then the element is necessarily a crack.
LINE_REF * <VALUE> * ( LINE *(( <VALUE> | ")<element1> <element2>) | COMPONENT *(( <VALUE> | ")<element3>) | DOMAIN *(( <VALUE> | ")<element4>) | ALL | ( <VALUE> | ")<element5>)This command is used to assign %NUREF as reference number to
If VALUE is entered, %NUREF takes this value and it is displayed on
the bottom line of the screen.
If the selected elements are cracks, %NUREF will be assigned to the side on
which the element, the LINE or the COMPONENT was clicked.
CRACK * ( LINE *(<element1><element2>) | COMPONENT * <element3> | ALL | <element4> )This command is used to crack a line in a mesh (the two side of a line a different in the mesh)
UNCRACK * ( LINE *(<element1><element2>) | COMPONENT * <element3> | ALL | <element4> )This command is used to uncrack
DOMAIN_REF *( <VALUE> | <domain> | ALL )This command is used to assign VALUE as subdomain reference number to the selected domain DOMAIN or to all defined domains. If DOMAIN does not exist, it is created.
DEF_DOMAI <element1> * (<element2> | INTERIOR *(<point> | <element3> | <line>) )
INTERIOR *( <element1> *( <point> | <element2> | <line>) )
The INTERIOR command is used to add interior elements to a domain selected by the element element1. The interior elements that can be added to a domain are point or the intermediate points of element2 or the intermediate points of the elements of line.
VERIFY *( ALL | <element>)
REMOVE *( INTERIOR *( <point> | <element1>) | DOMAIN *<element2> | ALL | <element3> )This is used to remove
TRIANGLE *<domain>Requests that the domain be divided into triangles by using a Voronoi algorithm [2]
QUADRANGLE *(<domain> ( <line> | <element> | ( EXTREMITY<element1> EXTREMITY<element2> EXTREMITY<element3> EXTREMITY<element4> ) | " ) )Requires that the domain be homeomorphic to a square (deformed quadrangle ). The command requests that the quadrangular subdomain should contain a structured, NxM finite difference type mesh like in figure 1.28. It will be divided into quadrangles, unless we change the partition mode with (1.5.4) if you want to use the GENERATE item 1.5.4. There are two ways of describing the quadrangular domain, by the four edges or the four vertices:
Figure 1.28: Example of QUANDRANGLE mesh: nb. points: on right and left edges is 6=N, and on lower and upper edge is 21=M
STRIP *(<domain> ( <line> | <element> | ( EXTREMITY<element1> EXTREMITY<element2> EXTREMITY<element3> EXTREMITY<element4> ) | " ) )Requires that the domain be homeomorphic to a square (deformed quadrangle) with an equal number of points N over a couple of opposite edges, like in figure 1.29 ( the case quadrangle requires the equality of numbre of points over the two couple of opposites edges , the `` quadragle mesh'' generator is always used in this case). (N-2) internal lines are generated, joining correspondind points of opposite edges and points are distributed on these lines using interpolation procedures. These (N-2) internal lines definie (N-1) strips which are divided into triangle using a special option of the mesh generator (no extra internal points are generated).
Figure 1.29: Example of STRIP mesh, nb. of node: on right and left edges is 6 = N , on lower edge is 11, and on upper edge is 31
Figure 1.30: Example of Delaunay-Voronoi mesh with the same input than in the previous figure
Figure 1.31: Example of STRIP mesh (Quadrangle mesh), nb. of nodes: on right and left edges is 6 = N , and on lower and upper edge is 21
There are two ways of describing the strip domain, by the four edges or the four vertices:
Remark: This kind of mesh generator is may be useful of the boundary layer region.
REGULAR *(<domain> <VALUE> )Requests that the partition of quadrangles into triangles in the domain be, see the MODULEF APNOPO booklet:
CORNERS *(<domain> <VALUE> )Requests that the partition of quadrangles into triangles in the domain be effected taking or not the corners into account, depending on the value ( Yes = 0 / No
SEE DOMAIN *(<domain> | <component> | ALL )This command is used to visualize using thick lines the domain or the componant selected by one of its elements. This operation is useful for debugging a mesh (problems with intersection, round off error).
GENERATEThis command is used to generate an input file for APNOXX (Modulef).