PyFluent文档｜06 Meshing网格工作流

Fluent的网格生成引导工作流程旨在简化从CAD几何到体网格生成的过程。用户可以使用PyFluent访问引导的工作流程。PyFluent除了可以使用传统的网格流程外，在较新的版本中又加入了功能更强大的Meshing工作流。

2 Meshing工作流

可以使用 PyFluent 访问新的增强型网格划分工作流。

2.1 Watertight geometry工作流

用 Watertight Geometry 工作流程可获得不需要太多清理或修改的水密 CAD 几何图形。下面的示例展示了如何使用Watertight Geometry工作流程。

2.1.1 导入几何

import ansys.fluent.core as pyfluent
from ansys.fluent.core import examples

import_file_name = examples.download_file('mixing_elbow.pmdb', 'pyfluent/mixing_elbow')
meshing = pyfluent.launch_fluent(
    mode="meshing", precision='double', processor_count=2
)
watertight = meshing.watertight()
watertight.import_geometry.file_name.set_state(import_file_name)
watertight.import_geometry.length_unit.set_state('in')
watertight.import_geometry()

2.1.2 增加局部尺寸

watertight.add_local_sizing.add_child_to_task()
watertight.add_local_sizing()

2.1.3 生成面网格

watertight.create_surface_mesh.cfd_surface_mesh_controls.max_size.set_state(0.3)
watertight.create_surface_mesh()

2.1.4 描述几何

watertight.describe_geometry.update_child_tasks(setup_type_changed=False)
watertight.describe_geometry.setup_type.set_state("The geometry consists of only fluid regions with no voids")
watertight.describe_geometry.update_child_tasks(setup_type_changed=True)
watertight.describe_geometry()

2.1.5 更新边界

watertight.update_boundaries.boundary_label_list.set_state(["wall-inlet"])
watertight.update_boundaries.boundary_label_type_list.set_state(["wall"])
watertight.update_boundaries.old_boundary_label_list.set_state(["wall-inlet"])
watertight.update_boundaries.old_boundary_label_type_list.set_state(["velocity-inlet"])
watertight.update_boundaries()

2.1.6 更新区域

watertight.update_regions()

2.1.7 添加边界层

watertight.add_boundary_layer.add_child_to_task()
watertight.add_boundary_layer.insert_compound_child_task()
watertight.task("smooth-transition_1").bl_control_name.set_state("smooth-transition_1")
watertight.add_boundary_layer.arguments = {}
watertight.task("smooth-transition_1")()

2.1.8 生成体网格

watertight.create_volume_mesh.volume_fill.set_state("poly-hexcore")
watertight.create_volume_mesh.volume_fill_controls.hex_max_cell_length.set_state(0.3)
watertight.create_volume_mesh()

2.1.9 切换至solution模式

solver = meshing.switch_to_solver()

2.2 Fault-tolerant工作流

使用Fault-tolerant网格划分工作流可处理更复杂的非水密 CAD 几何图形，这些几何模型可能需要某种形式的清理或修改（例如，重叠、交叉、孔洞、重复等缺陷）。下面的示例展示了如何使用容错工作流程。

2.2.1 导入 CAD 和部件管理

import ansys.fluent.core as pyfluent
from ansys.fluent.core import examples

import_file_name = examples.download_file(
    "exhaust_system.fmd", "pyfluent/exhaust_system"
)
meshing = pyfluent.launch_fluent(precision="double", processor_count=2, mode="meshing")
fault_tolerant = meshing.fault_tolerant()
meshing.PartManagement.InputFileChanged(
    FilePath=import_file_name, IgnoreSolidNames=False, PartPerBody=False
)
meshing.PMFileManagement.FileManager.LoadFiles()
meshing.PartManagement.Node["Meshing Model"].Copy(
    Paths=[
        "/dirty_manifold-for-wrapper," + "1/dirty_manifold-for-wrapper,1/main,1",
        "/dirty_manifold-for-wrapper," + "1/dirty_manifold-for-wrapper,1/flow-pipe,1",
        "/dirty_manifold-for-wrapper," + "1/dirty_manifold-for-wrapper,1/outpipe3,1",
        "/dirty_manifold-for-wrapper," + "1/dirty_manifold-for-wrapper,1/object2,1",
        "/dirty_manifold-for-wrapper," + "1/dirty_manifold-for-wrapper,1/object1,1",
    ]
)
meshing.PartManagement.ObjectSetting["DefaultObjectSetting"].OneZonePer.set_state("part")
fault_tolerant.import_cad_and_part_management.context.set_state(0)
fault_tolerant.import_cad_and_part_management.create_object_per.set_state("Custom")
fault_tolerant.import_cad_and_part_management.fmd_file_name.set_state(import_file_name)
fault_tolerant.import_cad_and_part_management.file_loaded.set_state("yes")
fault_tolerant.import_cad_and_part_management.object_setting.set_state("DefaultObjectSetting")
fault_tolerant.import_cad_and_part_management.options.line.set_state(False)
fault_tolerant.import_cad_and_part_management.options.solid.set_state(False)
fault_tolerant.import_cad_and_part_management.options.surface.set_state(False)
fault_tolerant.import_cad_and_part_management()

2.2.2 描述几何

fault_tolerant.describe_geometry_and_flow.add_enclosure.set_state("No")
fault_tolerant.describe_geometry_and_flow.close_caps.set_state("Yes")
fault_tolerant.describe_geometry_and_flow.flow_type.set_state("Internal flow through the object")
fault_tolerant.describe_geometry_and_flow.update_child_tasks(setup_type_changed=False)

fault_tolerant.describe_geometry_and_flow.add_enclosure.set_state("No")
fault_tolerant.describe_geometry_and_flow.close_caps.set_state("Yes")
fault_tolerant.describe_geometry_and_flow.describe_geometry_and_flow_options.advanced_options.set_state(True)
fault_tolerant.describe_geometry_and_flow.describe_geometry_and_flow_options.extract_edge_features.set_state("Yes")
fault_tolerant.describe_geometry_and_flow.flow_type.set_state("Internal flow through the object")
fault_tolerant.describe_geometry_and_flow.update_child_tasks(setup_type_changed=False)
fault_tolerant.describe_geometry_and_flow()

2.2.3 封闭流体区域（封盖）

fault_tolerant.enclose_fluid_regions_fault.create_patch_preferences.show_create_patch_preferences.set_state(False)
fault_tolerant.enclose_fluid_regions_fault.patch_name.set_state("inlet-1")
fault_tolerant.enclose_fluid_regions_fault.selection_type.set_state("zone")
fault_tolerant.enclose_fluid_regions_fault.zone_selection_list.set_state(["inlet.1"])

fault_tolerant.enclose_fluid_regions_fault.create_patch_preferences.show_create_patch_preferences.set_state(False)
fault_tolerant.enclose_fluid_regions_fault.patch_name.set_state("inlet-1")
fault_tolerant.enclose_fluid_regions_fault.selection_type.set_state("zone")
fault_tolerant.enclose_fluid_regions_fault.zone_location.set_state([
            "1",
            "351.68205",
            "-361.34322",
            "-301.88668",
            "396.96205",
            "-332.84759",
            "-266.69751",
            "inlet.1",
        ])
fault_tolerant.enclose_fluid_regions_fault.zone_selection_list.set_state(["inlet.1"])
fault_tolerant.enclose_fluid_regions_fault.add_child_to_task()
fault_tolerant.enclose_fluid_regions_fault.insert_compound_child_task()
fault_tolerant.enclose_fluid_regions_fault.arguments.set_state({})
fault_tolerant.task("inlet-1")()

fault_tolerant.enclose_fluid_regions_fault.patch_name.set_state("inlet-2")
fault_tolerant.enclose_fluid_regions_fault.selection_type.set_state("zone")
fault_tolerant.enclose_fluid_regions_fault.zone_selection_list.set_state(["inlet.2"])

fault_tolerant.enclose_fluid_regions_fault.patch_name.set_state("inlet-2")
fault_tolerant.enclose_fluid_regions_fault.selection_type.set_state("zone")
fault_tolerant.enclose_fluid_regions_fault.zone_location.set_state([
            "1",
            "441.68205",
            "-361.34322",
            "-301.88668",
            "486.96205",
            "-332.84759",
            "-266.69751",
            "inlet.2",
        ])
fault_tolerant.enclose_fluid_regions_fault.zone_selection_list.set_state(["inlet.2"])
fault_tolerant.enclose_fluid_regions_fault.add_child_to_task()
fault_tolerant.enclose_fluid_regions_fault.insert_compound_child_task()
fault_tolerant.enclose_fluid_regions_fault.arguments.set_state({})
fault_tolerant.task("inlet-2")()

fault_tolerant.enclose_fluid_regions_fault.patch_name.set_state("inlet-3")
fault_tolerant.enclose_fluid_regions_fault.selection_type.set_state("zone")
fault_tolerant.enclose_fluid_regions_fault.zone_selection_list.set_state(["inlet"])

fault_tolerant.enclose_fluid_regions_fault.patch_name.set_state("inlet-3")
fault_tolerant.enclose_fluid_regions_fault.selection_type.set_state("zone")
fault_tolerant.enclose_fluid_regions_fault.zone_location.set_state([
            "1",
            "261.68205",
            "-361.34322",
            "-301.88668",
            "306.96205",
            "-332.84759",
            "-266.69751",
            "inlet",
        ])
fault_tolerant.enclose_fluid_regions_fault.zone_selection_list.set_state(["inlet"])
fault_tolerant.enclose_fluid_regions_fault.add_child_to_task()
fault_tolerant.enclose_fluid_regions_fault.insert_compound_child_task()
fault_tolerant.enclose_fluid_regions_fault.arguments.set_state({})
fault_tolerant.task("inlet-3")()

fault_tolerant.enclose_fluid_regions_fault.patch_name.set_state("outlet-1")
fault_tolerant.enclose_fluid_regions_fault.selection_type.set_state("zone")
fault_tolerant.enclose_fluid_regions_fault.zone_selection_list.set_state(["outlet"])
fault_tolerant.enclose_fluid_regions_fault.zone_type.set_state("pressure-outlet")

fault_tolerant.enclose_fluid_regions_fault.patch_name.set_state("outlet-1")
fault_tolerant.enclose_fluid_regions_fault.selection_type.set_state("zone")
fault_tolerant.enclose_fluid_regions_fault.zone_location.set_state([
            "1",
            "352.22702",
            "-197.8957",
            "84.102381",
            "394.41707",
            "-155.70565",
            "84.102381",
            "outlet",
        ])
fault_tolerant.enclose_fluid_regions_fault.zone_selection_list.set_state(["outlet"])
fault_tolerant.enclose_fluid_regions_fault.zone_type.set_state("pressure-outlet")
fault_tolerant.enclose_fluid_regions_fault.add_child_to_task()
fault_tolerant.enclose_fluid_regions_fault.insert_compound_child_task()
fault_tolerant.enclose_fluid_regions_fault.arguments.set_state({})
fault_tolerant.task("outlet-1")()

2.2.4 提取边特征

fault_tolerant.extract_edge_features.extract_method_type.set_state("Intersection Loops")
fault_tolerant.extract_edge_features.object_selection_list.set_state(["flow_pipe", "main"])
fault_tolerant.extract_edge_features.add_child_to_task()
fault_tolerant.extract_edge_features.insert_compound_child_task()

fault_tolerant.extract_edge_features.extract_edges_name.set_state("edge-group-1")
fault_tolerant.extract_edge_features.extract_method_type.set_state("Intersection Loops")
fault_tolerant.extract_edge_features.object_selection_list.set_state(["flow_pipe", "main"])

fault_tolerant.extract_edge_features.arguments.set_state({})
fault_tolerant.task("edge-group-1")()

2.2.5 识别区域

fault_tolerant.identify_regions.selection_type.set_state("zone")
fault_tolerant.identify_regions.x.set_state(377.322045740589)
fault_tolerant.identify_regions.y.set_state(-176.800676988458)
fault_tolerant.identify_regions.z.set_state(-37.0764628583475)
fault_tolerant.identify_regions.zone_selection_list.set_state(["main.1"])

fault_tolerant.identify_regions.selection_type.set_state("zone")
fault_tolerant.identify_regions.x.set_state(377.322045740589)
fault_tolerant.identify_regions.y.set_state(-176.800676988458)
fault_tolerant.identify_regions.z.set_state(-37.0764628583475)
fault_tolerant.identify_regions.zone_location.set_state([
            "1",
            "213.32205",
            "-225.28068",
            "-158.25531",
            "541.32205",
            "-128.32068",
            "84.102381",
            "main.1",
        ])
fault_tolerant.identify_regions.zone_selection_list.set_state(["main.1"])
fault_tolerant.identify_regions.add_child_to_task()
fault_tolerant.identify_regions.insert_compound_child_task()

fault_tolerant.task("fluid-region-1").material_points_name.set_state("fluid-region-1")
fault_tolerant.task("fluid-region-1").selection_type.set_state("zone")
fault_tolerant.identify_regions.x.set_state(377.322045740589)
fault_tolerant.identify_regions.y.set_state(-176.800676988458)
fault_tolerant.identify_regions.z.set_state(-37.0764628583475)
fault_tolerant.identify_regions.zone_location.set_state([
            "1",
            "213.32205",
            "-225.28068",
            "-158.25531",
            "541.32205",
            "-128.32068",
            "84.102381",
            "main.1",
        ])
fault_tolerant.identify_regions.zone_selection_list.set_state(["main.1"])
fault_tolerant.identify_regions.arguments.set_state({})
fault_tolerant.task("fluid-region-1")()

fault_tolerant.identify_regions.material_points_name.set_state("void-region-1")
fault_tolerant.identify_regions.new_region_type.set_state("void")
fault_tolerant.identify_regions.object_selection_list.set_state(["inlet-1", "inlet-2", "inlet-3", "main"])
fault_tolerant.identify_regions.x.set_state(374.722045740589)
fault_tolerant.identify_regions.y.set_state(-278.9775145640143)
fault_tolerant.identify_regions.z.set_state(-161.1700719416913)
fault_tolerant.identify_regions.add_child_to_task()
fault_tolerant.identify_regions.insert_compound_child_task()
fault_tolerant.identify_regions.arguments.set_state({})
fault_tolerant.task("void-region-1")()

2.2.6 定义泄漏阈值

fault_tolerant.define_leakage_threshold.add_child.set_state("yes")
fault_tolerant.define_leakage_threshold.flip_direction.set_state(True)
fault_tolerant.define_leakage_threshold.plane_direction.set_state("X")
fault_tolerant.define_leakage_threshold.region_selection_single.set_state("void-region-1")
fault_tolerant.define_leakage_threshold.add_child_to_task()
fault_tolerant.define_leakage_threshold.insert_compound_child_task()

fault_tolerant.task("leakage-1").arguments.set_state(
    {
        "AddChild": "yes",
        "FlipDirection": True,
        "LeakageName": "leakage-1",
        "PlaneDirection": "X",
        "RegionSelectionSingle": "void-region-1",
    }
)

fault_tolerant.define_leakage_threshold.add_child.set_state("yes")

fault_tolerant.task("leakage-1")()

2.2.7 更新区域设置

fault_tolerant.update_region_settings.all_region_filter_categories.set_state(["2"] * 5 + ["1"] * 2)
fault_tolerant.update_region_settings.all_region_leakage_size_list.set_state(["none"] * 6 + ["6.4"])
fault_tolerant.update_region_settings.all_region_linked_construction_surface_list.set_state(["n/a"] * 6 + ["no"])
fault_tolerant.update_region_settings.all_region_mesh_method_list.set_state(["none"] * 6 + ["wrap"])
fault_tolerant.update_region_settings.all_region_name_list.set_state([
            "main",
            "flow_pipe",
            "outpipe3",
            "object2",
            "object1",
            "void-region-1",
            "fluid-region-1",
        ])
fault_tolerant.update_region_settings.all_region_overset_componen_list.set_state(["no"] * 7)
fault_tolerant.update_region_settings.all_region_source_list.set_state(["object"] * 5 + ["mpt"] * 2)
fault_tolerant.update_region_settings.all_region_type_list.set_state(["void"] * 6 + ["fluid"])
fault_tolerant.update_region_settings.all_region_volume_fill_list.set_state(["none"] * 6 + ["tet"])
fault_tolerant.update_region_settings.filter_category.set_state("Identified Regions")
fault_tolerant.update_region_settings.old_region_leakage_size_list.set_state([""])
fault_tolerant.update_region_settings.old_region_mesh_method_list.set_state(["wrap"])
fault_tolerant.update_region_settings.old_region_name_list.set_state(["fluid-region-1"])
fault_tolerant.update_region_settings.old_region_overset_componen_list.set_state(["no"])
fault_tolerant.update_region_settings.old_region_type_list.set_state(["fluid"])
fault_tolerant.update_region_settings.old_region_volume_fill_list.set_state(["hexcore"])
fault_tolerant.update_region_settings.region_leakage_size_list.set_state([""])
fault_tolerant.update_region_settings.region_mesh_method_list.set_state(["wrap"])
fault_tolerant.update_region_settings.region_name_list.set_state(["fluid-region-1"])
fault_tolerant.update_region_settings.region_overset_componen_list.set_state(["no"])
fault_tolerant.update_region_settings.region_type_list.set_state(["fluid"])
fault_tolerant.update_region_settings.region_volume_fill_list.set_state(["tet"])
fault_tolerant.update_region_settings()

2.2.8 选择网格控制选项

fault_tolerant.choose_mesh_control_options()

2.2.9 生成面网格

fault_tolerant.generate_the_surface_mesh()

2.2.10 更新边界

fault_tolerant.update_boundaries_ftm()

2.2.11 添加边界层

fault_tolerant.add_boundary_layer_ftm.add_child_to_task()
fault_tolerant.add_boundary_layer_ftm.insert_compound_child_task()
fault_tolerant.task("aspect-ratio_1").bl_control_name.set_state("aspect-ratio_1")
fault_tolerant.add_boundary_layer_ftm.arguments.set_state({})
fault_tolerant.task("aspect-ratio_1")()

2.2.12 生成体网格

fault_tolerant.generate_the_volume_mesh.all_region_name_list.set_state([
            "main",
            "flow_pipe",
            "outpipe3",
            "object2",
            "object1",
            "void-region-1",
            "fluid-region-1",
        ])
fault_tolerant.generate_the_volume_mesh.all_region_size_list.set_state(["11.33375"] * 7)
fault_tolerant.generate_the_volume_mesh.all_region_volume_fill_list.set_state(["none"] * 6 + ["tet"])
fault_tolerant.generate_the_volume_mesh.enable_parallel.set_state(True)
fault_tolerant.generate_the_volume_mesh()

2.2.13 切换至solution模式

solver = meshing.switch_to_solver()