Coverage for src/meshpy/core/boundary_condition.py: 95%

1# The MIT License (MIT) 

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22"""This module implements a class to represent boundary conditions in 

23MeshPy.""" 

24 

25import warnings as _warnings 

26from typing import Dict as _Dict 

27from typing import Optional as _Optional 

28from typing import Union as _Union 

29 

30import meshpy.core.conf as _conf 

31from meshpy.core.base_mesh_item import BaseMeshItem as _BaseMeshItem 

32from meshpy.core.conf import mpy as _mpy 

33from meshpy.core.container import ContainerBase as _ContainerBase 

34from meshpy.core.geometry_set import GeometrySet as _GeometrySet 

35from meshpy.core.geometry_set import GeometrySetBase as _GeometrySetBase 

36from meshpy.utils.nodes import find_close_nodes as _find_close_nodes 

37 

38 

39class BoundaryConditionBase(_BaseMeshItem): 

40 """Base class for boundary conditions.""" 

41 

42 def __init__( 

43 self, 

44 geometry_set: _GeometrySetBase, 

45 bc_type: _Union[_conf.BoundaryCondition, str], 

46 **kwargs, 

47 ): 

48 """Initialize the boundary condition. 

49 

50 Args: 

51 geometry_set: Geometry that this boundary condition acts on. 

52 bc_type: Type of the boundary condition. 

53 """ 

54 

55 super().__init__(**kwargs) 

56 self.bc_type = bc_type 

57 self.geometry_set = geometry_set 

58 

59 

60class BoundaryCondition(BoundaryConditionBase): 

61 """This object represents one boundary condition, e.g., Dirichlet, Neumann, 

62 ...""" 

63 

64 def __init__( 

65 self, 

66 geometry_set: _GeometrySetBase, 

67 data: _Dict, 

68 bc_type: _Union[_conf.BoundaryCondition, str], 

69 *, 

70 double_nodes: _Optional[_conf.DoubleNodes] = None, 

71 **kwargs, 

72 ): 

73 """Initialize the object. 

74 

75 Args: 

76 geometry_set: Geometry that this boundary condition acts on. 

77 data: Data defining the properties of this boundary condition. 

78 bc_type: If this is a string, this will be the section that 

79 this BC will be added to. If it is a mpy.bc, the section will 

80 be determined automatically. 

81 double_nodes: Depending on this parameter, it will be checked if point 

82 Neumann conditions do contain nodes at the same spatial positions. 

83 """ 

84 

85 super().__init__(geometry_set, bc_type, data=data, **kwargs) 

86 self.double_nodes = double_nodes 

87 

88 # Perform some sanity checks for this boundary condition. 

89 self.check() 

90 

91 def check(self): 

92 """Check for point Neumann boundaries that there is not a double Node 

93 in the set. 

94 

95 Duplicate nodes in a point Neumann boundary condition can lead 

96 to the same force being applied multiple times at the same 

97 spatial position, which results in incorrect load application. 

98 """ 

99 

100 if self.double_nodes is _mpy.double_nodes.keep: 

101 return 

102 

103 if ( 

104 self.bc_type == _mpy.bc.neumann 

105 and self.geometry_set.geometry_type == _mpy.geo.point 

106 ): 

107 my_nodes = self.geometry_set.get_points() 

108 partners = _find_close_nodes(my_nodes) 

109 # Create a list with nodes that will not be kept in the set. 

110 double_node_list = [] 

111 for node_list in partners: 

112 for i, node in enumerate(node_list): 

113 if i > 0: 

114 double_node_list.append(node) 

115 if ( 

116 len(double_node_list) > 0 

117 and self.double_nodes is _mpy.double_nodes.remove 

118 ): 

119 # Create the a new geometry set with the unique nodes. 

120 self.geometry_set = _GeometrySet( 

121 [node for node in my_nodes if (node not in double_node_list)] 

122 ) 

123 elif len(double_node_list) > 0: 

124 _warnings.warn( 

125 "There are overlapping nodes in this point Neumann boundary, and it is not " 

126 "specified on how to handle them!" 

127 ) 

128 

129 

130class BoundaryConditionContainer(_ContainerBase): 

131 """A class to group boundary conditions together. 

132 

133 The key of the dictionary are (bc_type, geometry_type). 

134 """ 

135 

136 def __init__(self, *args, **kwargs): 

137 """Initialize the container and create the default keys in the map.""" 

138 super().__init__(*args, **kwargs) 

139 

140 self.item_types = [BoundaryConditionBase] 

141 

142 for bc_key in _mpy.bc: 

143 for geometry_key in _mpy.geo: 

144 self[(bc_key, geometry_key)] = []