src/Mod/Fem/femsolver/calculix/write_constraint_tie.py

# ***************************************************************************
# *   Copyright (c) 2021 Bernd Hahnebach <bernd@bimstatik.org>              *
# *                                                                         *
# *   This file is part of the FreeCAD CAx development system.              *
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__title__ = "FreeCAD FEM calculix constraint tie"
__author__ = "Bernd Hahnebach"
__url__ = "https://www.freecad.org"


from FreeCAD import Units, Vector


def get_analysis_types():
    return "all"  # write for all analysis types


def get_sets_name():
    return "constraints_tie_surface_sets"


def get_constraint_title():
    return "Tie Constraints"


def get_before_write_meshdata_constraint():
    return ""


def get_after_write_meshdata_constraint():
    return ""


def get_before_write_constraint():
    return ""


def get_after_write_constraint():
    return ""


def write_meshdata_constraint(f, femobj, tie_obj, ccxwriter):
    # slave DEP
    f.write(f"*SURFACE, NAME=TIE_DEP{tie_obj.Name}\n")
    for refs, surf, is_sub_el in femobj["TieSlaveFaces"]:
        if is_sub_el:
            for elem, fno in surf:
                f.write(f"{elem},S{fno}\n")
        else:
            for elem in surf:
                f.write(f"{elem},S2\n")

    # master IND
    f.write(f"*SURFACE, NAME=TIE_IND{tie_obj.Name}\n")
    for refs, surf, is_sub_el in femobj["TieMasterFaces"]:
        if is_sub_el:
            for elem, fno in surf:
                f.write(f"{elem},S{fno}\n")
        else:
            for elem in surf:
                f.write(f"{elem},S2\n")


def write_constraint(f, femobj, tie_obj, ccxwriter):

    # floats read from ccx should use {:.13G}, see comment in writer module

    tolerance = tie_obj.Tolerance.getValueAs("mm").Value
    adjust = ""
    symmetry = ""
    tie_name = tie_obj.Name
    if not tie_obj.Adjust:
        adjust = ", ADJUST=NO"

    if tie_obj.CyclicSymmetry:
        symmetry = ", CYCLIC SYMMETRY"

    f.write(
        "*TIE, POSITION TOLERANCE={:.13G}{}{}, NAME=TIE{}\n".format(
            tolerance, adjust, symmetry, tie_name
        )
    )
    ind_surf = f"TIE_IND{tie_name}"
    dep_surf = f"TIE_DEP{tie_name}"
    f.write(f"{dep_surf}, {ind_surf}\n")

    # write CYCLIC SYMMETRY MODEL card
    if tie_obj.CyclicSymmetry:
        f.write(
            "*CYCLIC SYMMETRY MODEL, N={}, NGRAPH={}, TIE=TIE{}, ELSET=Eall\n".format(
                tie_obj.Sectors, tie_obj.ConnectedSectors, tie_name
            )
        )

        # get symmetry axis points
        vec_a = tie_obj.SymmetryAxis.Base
        vec_b = tie_obj.SymmetryAxis * Vector(0, 0, 1)

        set_unit = lambda x: Units.Quantity(x, Units.Length).getValueAs("mm").Value
        point_a = [set_unit(coord) for coord in vec_a]
        point_b = [set_unit(coord) for coord in vec_b]

        f.write("{:.13G},{:.13G},{:.13G},{:.13G},{:.13G},{:.13G}\n".format(*point_a, *point_b))