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PyFluent文档｜05 网格生成-传统流程

详细信息

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CFD之道

4月前浏览6329

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。

工作流程被划分为新的网格生成工作流程和经典网格生成工作流程，它们与日志语法对齐。

1 传统网格工作流程

可以使用PyFluent来访问与日志语法一致的经典网格工作流程。

1.1 Watertight geometry网格工作流

使用 Watertight Geometry 工作流来处理不需要大量清理或修改的封闭CAD几何体。以下示例展示了如何使用Watertight Geometry工作流。

1.1.1 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
)
meshing.workflow.InitializeWorkflow(WorkflowType='Watertight Geometry')
meshing.workflow.TaskObject['Import Geometry'].Arguments = {
    'FileName': import_file_name, 'LengthUnit': 'in'
}
meshing.workflow.TaskObject['Import Geometry'].Execute()

1.1.2 添加局部尺寸

meshing.workflow.TaskObject['Add Local Sizing'].AddChildToTask()
meshing.workflow.TaskObject['Add Local Sizing'].Execute()

1.1.3 生成面网格

meshing.workflow.TaskObject['Generate the Surface Mesh'].Arguments = {
    'CFDSurfaceMeshControls': {'MaxSize': 0.3}
}
meshing.workflow.TaskObject['Generate the Surface Mesh'].Execute()

1.1.4 描述几何

meshing.workflow.TaskObject["Describe Geometry"].UpdateChildTasks(
    SetupTypeChanged=False
)
meshing.workflow.TaskObject["Describe Geometry"].Arguments = {
    SetupType: "The geometry consists of only fluid regions with no voids"
}
meshing.workflow.TaskObject["Describe Geometry"].UpdateChildTasks(SetupTypeChanged=True)
meshing.workflow.TaskObject["Describe Geometry"].Execute()

1.1.5 更新边界

meshing.workflow.TaskObject["Update Boundaries"].Arguments = {
    "BoundaryLabelList": ["wall-inlet"],
    "BoundaryLabelTypeList": ["wall"],
    "OldBoundaryLabelList": ["wall-inlet"],
    "OldBoundaryLabelTypeList": ["velocity-inlet"],
}
meshing.workflow.TaskObject["Update Boundaries"].Execute()

1.1.6 更新区域

meshing.workflow.TaskObject["Update Regions"].Execute()

1.1.7 添加边界层

meshing.workflow.TaskObject["Add Boundary Layers"].AddChildToTask()
meshing.workflow.TaskObject["Add Boundary Layers"].InsertCompoundChildTask()
meshing.workflow.TaskObject["smooth-transition_1"].Arguments = {
    "BLControlName": "smooth-transition_1",
}
meshing.workflow.TaskObject["Add Boundary Layers"].Arguments = {}
meshing.workflow.TaskObject["smooth-transition_1"].Execute()

1.1.8 生成体网格

meshing.workflow.TaskObject["Generate the Volume Mesh"].Arguments = {
    "VolumeFill": "poly-hexcore",
    "VolumeFillControls": {
        "HexMaxCellLength": 0.3,
    },
}
meshing.workflow.TaskObject["Generate the Volume Mesh"].Execute()

1.1.9 切换到solution模式

solver = meshing.switch_to_solver()

1.2 Fault-tolerant meshing工作流

使用Fault-tolerant网格划分工作流程可处理更复杂的非水密 CAD 几何图形，这些几何图形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Fault-tolerant工作流程。

1.2.1 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")
meshing.workflow.InitializeWorkflow(WorkflowType="Fault-tolerant Meshing")
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")
meshing.workflow.TaskObject["Import CAD and Part Management"].Arguments.set_state(
    {
        "Context": 0,
        "CreateObjectPer": "Custom",
        "FMDFileName": import_file_name,
        "FileLoaded": "yes",
        "ObjectSetting": "DefaultObjectSetting",
        "Options": {
            "Line": False,
            "Solid": False,
            "Surface": False,
        },
    }
)
meshing.workflow.TaskObject["Import CAD and Part Management"].Execute()

1.2.2 描述几何形状和流动

meshing.workflow.TaskObject["Describe Geometry and Flow"].Arguments.set_state(
    {
        "AddEnclosure": "No",
        "CloseCaps": "Yes",
        "FlowType": "Internal flow through the object",
    }
)
meshing.workflow.TaskObject["Describe Geometry and Flow"].UpdateChildTasks(
    SetupTypeChanged=False
)
meshing.workflow.TaskObject["Describe Geometry and Flow"].Arguments.set_state(
    {
        "AddEnclosure": "No",
        "CloseCaps": "Yes",
        "DescribeGeometryAndFlowOptions": {
            "AdvancedOptions": True,
            "ExtractEdgeFeatures": "Yes",
        },
        "FlowType": "Internal flow through the object",
    }
)
meshing.workflow.TaskObject["Describe Geometry and Flow"].UpdateChildTasks(
    SetupTypeChanged=False
)
meshing.workflow.TaskObject["Describe Geometry and Flow"].Execute()

1.2.3 封闭流体区域（封盖）

meshing.workflow.TaskObject["Enclose Fluid Regions (Capping)"].Arguments.set_state(
    {
        "CreatePatchPreferences": {
            "ShowCreatePatchPreferences": False,
        },
        "PatchName": "inlet-1",
        "SelectionType": "zone",
        "ZoneSelectionList": ["inlet.1"],
    }
)
meshing.workflow.TaskObject["Enclose Fluid Regions (Capping)"].Arguments.set_state(
    {
        "CreatePatchPreferences": {
            "ShowCreatePatchPreferences": False,
        },
        "PatchName": "inlet-1",
        "SelectionType": "zone",
        "ZoneLocation": [
            "1",
            "351.68205",
            "-361.34322",
            "-301.88668",
            "396.96205",
            "-332.84759",
            "-266.69751",
            "inlet.1",
        ],
        "ZoneSelectionList": ["inlet.1"],
    }
)
meshing.workflow.TaskObject["Enclose Fluid Regions (Capping)"].AddChildToTask()

meshing.workflow.TaskObject["Enclose Fluid Regions (Capping)"].InsertCompoundChildTask()
meshing.workflow.TaskObject["Enclose Fluid Regions (Capping)"].Arguments.set_state({})
meshing.workflow.TaskObject["inlet-1"].Execute()
meshing.workflow.TaskObject["Enclose Fluid Regions (Capping)"].Arguments.set_state(
    {
        "PatchName": "inlet-2",
        "SelectionType": "zone",
        "ZoneSelectionList": ["inlet.2"],
    }
)
meshing.workflow.TaskObject["Enclose Fluid Regions (Capping)"].Arguments.set_state(
    {
        "PatchName": "inlet-2",
        "SelectionType": "zone",
        "ZoneLocation": [
            "1",
            "441.68205",
            "-361.34322",
            "-301.88668",
            "486.96205",
            "-332.84759",
            "-266.69751",
            "inlet.2",
        ],
        "ZoneSelectionList": ["inlet.2"],
    }
)
meshing.workflow.TaskObject["Enclose Fluid Regions (Capping)"].AddChildToTask()

meshing.workflow.TaskObject["Enclose Fluid Regions (Capping)"].InsertCompoundChildTask()
meshing.workflow.TaskObject["Enclose Fluid Regions (Capping)"].Arguments.set_state({})
meshing.workflow.TaskObject["inlet-2"].Execute()
meshing.workflow.TaskObject["Enclose Fluid Regions (Capping)"].Arguments.set_state(
    {
        "PatchName": "inlet-3",
        "SelectionType": "zone",
        "ZoneSelectionList": ["inlet"],
    }
)
meshing.workflow.TaskObject["Enclose Fluid Regions (Capping)"].Arguments.set_state(
    {
        "PatchName": "inlet-3",
        "SelectionType": "zone",
        "ZoneLocation": [
            "1",
            "261.68205",
            "-361.34322",
            "-301.88668",
            "306.96205",
            "-332.84759",
            "-266.69751",
            "inlet",
        ],
        "ZoneSelectionList": ["inlet"],
    }
)
meshing.workflow.TaskObject["Enclose Fluid Regions (Capping)"].AddChildToTask()

meshing.workflow.TaskObject["Enclose Fluid Regions (Capping)"].InsertCompoundChildTask()
meshing.workflow.TaskObject["Enclose Fluid Regions (Capping)"].Arguments.set_state({})
meshing.workflow.TaskObject["inlet-3"].Execute()
meshing.workflow.TaskObject["Enclose Fluid Regions (Capping)"].Arguments.set_state(
    {
        "PatchName": "outlet-1",
        "SelectionType": "zone",
        "ZoneSelectionList": ["outlet"],
        "ZoneType": "pressure-outlet",
    }
)
meshing.workflow.TaskObject["Enclose Fluid Regions (Capping)"].Arguments.set_state(
    {
        "PatchName": "outlet-1",
        "SelectionType": "zone",
        "ZoneLocation": [
            "1",
            "352.22702",
            "-197.8957",
            "84.102381",
            "394.41707",
            "-155.70565",
            "84.102381",
            "outlet",
        ],
        "ZoneSelectionList": ["outlet"],
        "ZoneType": "pressure-outlet",
    }
)
meshing.workflow.TaskObject["Enclose Fluid Regions (Capping)"].AddChildToTask()

meshing.workflow.TaskObject["Enclose Fluid Regions (Capping)"].InsertCompoundChildTask()
meshing.workflow.TaskObject["Enclose Fluid Regions (Capping)"].Arguments.set_state({})
meshing.workflow.TaskObject["outlet-1"].Execute()

1.2.4 提取边特征

meshing.workflow.TaskObject["Extract Edge Features"].Arguments.set_state(
    {
        "ExtractMethodType": "Intersection Loops",
        "ObjectSelectionList": ["flow_pipe", "main"],
    }
)
meshing.workflow.TaskObject["Extract Edge Features"].AddChildToTask()

meshing.workflow.TaskObject["Extract Edge Features"].InsertCompoundChildTask()

meshing.workflow.TaskObject["edge-group-1"].Arguments.set_state(
    {
        "ExtractEdgesName": "edge-group-1",
        "ExtractMethodType": "Intersection Loops",
        "ObjectSelectionList": ["flow_pipe", "main"],
    }
)
meshing.workflow.TaskObject["Extract Edge Features"].Arguments.set_state({})

meshing.workflow.TaskObject["edge-group-1"].Execute()

1.2.5 确定区域

meshing.workflow.TaskObject["Identify Regions"].Arguments.set_state(
    {
        "SelectionType": "zone",
        "X": 377.322045740589,
        "Y": -176.800676988458,
        "Z": -37.0764628583475,
        "ZoneSelectionList": ["main.1"],
    }
)
meshing.workflow.TaskObject["Identify Regions"].Arguments.set_state(
    {
        "SelectionType": "zone",
        "X": 377.322045740589,
        "Y": -176.800676988458,
        "Z": -37.0764628583475,
        "ZoneLocation": [
            "1",
            "213.32205",
            "-225.28068",
            "-158.25531",
            "541.32205",
            "-128.32068",
            "84.102381",
            "main.1",
        ],
        "ZoneSelectionList": ["main.1"],
    }
)
meshing.workflow.TaskObject["Identify Regions"].AddChildToTask()

meshing.workflow.TaskObject["Identify Regions"].InsertCompoundChildTask()

meshing.workflow.TaskObject["fluid-region-1"].Arguments.set_state(
    {
        "MaterialPointsName": "fluid-region-1",
        "SelectionType": "zone",
        "X": 377.322045740589,
        "Y": -176.800676988458,
        "Z": -37.0764628583475,
        "ZoneLocation": [
            "1",
            "213.32205",
            "-225.28068",
            "-158.25531",
            "541.32205",
            "-128.32068",
            "84.102381",
            "main.1",
        ],
        "ZoneSelectionList": ["main.1"],
    }
)
meshing.workflow.TaskObject["Identify Regions"].Arguments.set_state({})

meshing.workflow.TaskObject["fluid-region-1"].Execute()
meshing.workflow.TaskObject["Identify Regions"].Arguments.set_state(
    {
        "MaterialPointsName": "void-region-1",
        "NewRegionType": "void",
        "ObjectSelectionList": ["inlet-1", "inlet-2", "inlet-3", "main"],
        "X": 374.722045740589,
        "Y": -278.9775145640143,
        "Z": -161.1700719416913,
    }
)
meshing.workflow.TaskObject["Identify Regions"].AddChildToTask()

meshing.workflow.TaskObject["Identify Regions"].InsertCompoundChildTask()

meshing.workflow.TaskObject["Identify Regions"].Arguments.set_state({})

meshing.workflow.TaskObject["void-region-1"].Execute()

1.2.6 定义泄漏阈值

meshing.workflow.TaskObject["Define Leakage Threshold"].Arguments.set_state(
    {
        "AddChild": "yes",
        "FlipDirection": True,
        "PlaneDirection": "X",
        "RegionSelectionSingle": "void-region-1",
    }
)
meshing.workflow.TaskObject["Define Leakage Threshold"].AddChildToTask()

meshing.workflow.TaskObject["Define Leakage Threshold"].InsertCompoundChildTask()
meshing.workflow.TaskObject["leakage-1"].Arguments.set_state(
    {
        "AddChild": "yes",
        "FlipDirection": True,
        "LeakageName": "leakage-1",
        "PlaneDirection": "X",
        "RegionSelectionSingle": "void-region-1",
    }
)
meshing.workflow.TaskObject["Define Leakage Threshold"].Arguments.set_state(
    {
        "AddChild": "yes",
    }
)
meshing.workflow.TaskObject["leakage-1"].Execute()

1.2.7 更新区域设置

meshing.workflow.TaskObject["Update Region Settings"].Arguments.set_state(
    {
        "AllRegionFilterCategories": ["2"] * 5 + ["1"] * 2,
        "AllRegionLeakageSizeList": ["none"] * 6 + ["6.4"],
        "AllRegionLinkedConstructionSurfaceList": ["n/a"] * 6 + ["no"],
        "AllRegionMeshMethodList": ["none"] * 6 + ["wrap"],
        "AllRegionNameList": [
            "main",
            "flow_pipe",
            "outpipe3",
            "object2",
            "object1",
            "void-region-1",
            "fluid-region-1",
        ],
        "AllRegionOversetComponenList": ["no"] * 7,
        "AllRegionSourceList": ["object"] * 5 + ["mpt"] * 2,
        "AllRegionTypeList": ["void"] * 6 + ["fluid"],
        "AllRegionVolumeFillList": ["none"] * 6 + ["tet"],
        "FilterCategory": "Identified Regions",
        "OldRegionLeakageSizeList": [""],
        "OldRegionMeshMethodList": ["wrap"],
        "OldRegionNameList": ["fluid-region-1"],
        "OldRegionOversetComponenList": ["no"],
        "OldRegionTypeList": ["fluid"],
        "OldRegionVolumeFillList": ["hexcore"],
        "RegionLeakageSizeList": [""],
        "RegionMeshMethodList": ["wrap"],
        "RegionNameList": ["fluid-region-1"],
        "RegionOversetComponenList": ["no"],
        "RegionTypeList": ["fluid"],
        "RegionVolumeFillList": ["tet"],
    }
)
meshing.workflow.TaskObject["Update Region Settings"].Execute()

1.2.8 选择网格控制选项

meshing.workflow.TaskObject["Choose Mesh Control Options"].Execute()

1.2.9 生成面网格

meshing.workflow.TaskObject["Generate the Surface Mesh"].Execute()

1.2.9 更新边界

meshing.workflow.TaskObject["Update Boundaries"].Execute()

1.2.10 添加边界层

meshing.workflow.TaskObject["Add Boundary Layers"].AddChildToTask()

meshing.workflow.TaskObject["Add Boundary Layers"].InsertCompoundChildTask()

meshing.workflow.TaskObject["aspect-ratio_1"].Arguments.set_state(
    {
        "BLControlName": "aspect-ratio_1",
    }
)
meshing.workflow.TaskObject["Add Boundary Layers"].Arguments.set_state({})

meshing.workflow.TaskObject["aspect-ratio_1"].Execute()

1.2.11 生成体网格

meshing.workflow.TaskObject["Generate the Volume Mesh"].Arguments.set_state(
    {
        "AllRegionNameList": [
            "main",
            "flow_pipe",
            "outpipe3",
            "object2",
            "object1",
            "void-region-1",
            "fluid-region-1",
        ],
        "AllRegionSizeList": ["11.33375"] * 7,
        "AllRegionVolumeFillList": ["none"] * 6 + ["tet"],
        "EnableParallel": True,
    }
)
meshing.workflow.TaskObject["Generate the Volume Mesh"].Execute()

1.2.12 切换至solution模式

solver = meshing.switch_to_solver()

1.3 命令参数使用示例

这个简单的例子展示了如何在一个Watertight Geometry工作流中使用CommandArgument属性和显式属性访问方法。

注意：CommandArgument 属性为只读属性。

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)
w = meshing.workflow
w.InitializeWorkflow(WorkflowType="Watertight Geometry")

w.TaskObject["Import Geometry"].CommandArguments()
w.TaskObject["Import Geometry"].CommandArguments.FileName.is_read_only()
w.TaskObject["Import Geometry"].CommandArguments.LengthUnit.is_active()
w.TaskObject["Import Geometry"].CommandArguments.LengthUnit.allowed_values()
w.TaskObject["Import Geometry"].CommandArguments.LengthUnit.default_value()
w.TaskObject["Import Geometry"].CommandArguments.LengthUnit()
w.TaskObject["Import Geometry"].CommandArguments.CadImportOptions.OneZonePer()
w.TaskObject["Import Geometry"].CommandArguments.CadImportOptions.FeatureAngle.min()

1.4 一些改进

可以调用TaskObject来获取其状态：

meshing.workflow.TaskObject()

TaskObject中的项目现在可以通过设置字典风格来访问：

for name, object in meshing.workflow.TaskObject.items():
    ...

注：本文内容取自PyFluent UserGuide。
”

来源：CFD之道

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首次发布时间：2024-06-23