general operands ==== Operand MODELE ---- The MODELE keyword expects a concept produced by the operator AFFE_MODELE where the types of finite elements affected on the mesh. The model is necessarily of the MECANIQUE type. Operands CHAM_MATER and CARA_ELEM ---- The CHAM_MATER keyword should be provided when giving FORCE_COQUE_FO a function that depends on the density (parameter RHO). The CARA_ELEM keyword should be provided when giving FORCE_COQUE_FO a function that depends the thickness of the shell mesh (EP parameter). Operand DOUBLE_LAGRANGE ---- This keyword allows you to say whether or not the user wants to split the multipliers of Lagrange used to define dualize the boundary conditions in the assembled matrix. Concretely, splitting Lagrange multipliers makes it possible to use linear solvers in allowing no pivoting. By not duplicating the Lagrange, you can reduce the number of degrees of freedom of the problem (and therefore the size of the problem to be solved) but its use is limited to solvers MUMPS and Petsc. Note that the two Lagrange multipliers associated with the relationship will be such as the first will be located before all the terms involved in the relationship and the second after, in the matrix assembly. This choice has the advantage of having an assembled matrix that takes up more space. weak but has the disadvantage of being able to make a singularity appear in the matrix. The numbering is in any case liable to be modified by the renumber of the solver external selected, this detail therefore remains purely technical. Operand VERI_NORM ---- The VERI_NORM keyword checks the orientation of the normals to the 3D surface meshes (meshes skin elements TRIA or QUAD) and linear in 2D (skin elements SEG). If a normal is not outgoing, a fatal error message is sent. To reorient the meshes so as to have outgoing normals, you must use the MODI_MAILLAGE [:ref:`U4.23.04 `] ORIE_PEAU keyword command. No checks are made on the shells. To check their orientation, we send also with command MODI_MAILLAGE, keyword ORIE_NORM_COQUE. Operand VERI_AFFE ---- The VERI_AFFE keyword checks the relevance of the assignments requested according to the types of finite elements. For example, we check that a pressure imposed by PRES_REP is not affected on solid or punctual elements. It is possible to deactivate these checks, on large models, if they take too long. Operand INFO ---- The INFO keyword manages the level of impressions on the message file. Operand ANGL_NAUT/CENTRE/TRAN ---- ANGL_NAUT allows you to define a coordinate system using nautical angles in degrees. CENTRE gives the coordinates of the center of rotation (in the global coordinate system). TRAN gives the components of the translation vector (in the global coordinate system).