Note
Go to the end to download the full example code
Validate External Layer results with full Mesh#
使用完整网格验证外层结果
- 此示例显示以下各项之间的后处理比较:
仅在外层提取结果和网格。
在整个网格上提取结果和网格。
外层是 solid 单元层,其中至少有一个面朝向几何体的外部。
该功能适用于所有类型的力学仿真,允许您缩小网格和提取数据的大小,以提高处理性能。由于较大的应力和应变通常位于模型的外层,因此在大多数情况下,在外层计算结果可提供等效的最大值。
Perform required imports#
执行所需的导入
本示例使用了一个提供的文件,您可以通过导入 DPF examples 包获得该文件。
from ansys.dpf import post
from ansys.dpf.post import examples
Get Simulation object#
将结果文件加载到允许访问结果的 ``Simulation`` 对象中
必须使用结果文件的路径实例化 Simulation 对象。例如,Windows 下为 "C:/Users/user/my_result.rst" 或 Linux 下为 "/home/user/my_result.rst" 。
example_path = examples.download_crankshaft()
# 自动检测模拟类型,请使用
simulation = post.load_simulation(example_path)
# 要启用自动完成功能,请使用等效的命令:
simulation = post.StaticMechanicalSimulation(example_path)
# 打印 simulation,了解可用内容的概况
print(simulation)
Static Mechanical Simulation.
Data Sources
------------------------------
C:\Users\ff\AppData\Roaming\Python\Python310\site-packages\ansys\dpf\core\examples\result_files\crankshaft\crankshaft.rst
DPF Model
------------------------------
Static analysis
Unit system: MKS: m, kg, N, s, V, A, degC
Physics Type: Mechanical
Available results:
- displacement: Nodal Displacement
- velocity: Nodal Velocity
- acceleration: Nodal Acceleration
- reaction_force: Nodal Force
- stress: ElementalNodal Stress
- elemental_volume: Elemental Volume
- stiffness_matrix_energy: Elemental Energy-stiffness matrix
- artificial_hourglass_energy: Elemental Hourglass Energy
- thermal_dissipation_energy: Elemental thermal dissipation energy
- kinetic_energy: Elemental Kinetic Energy
- co_energy: Elemental co-energy
- incremental_energy: Elemental incremental energy
- elastic_strain: ElementalNodal Strain
- structural_temperature: ElementalNodal Temperature
------------------------------
DPF Meshed Region:
69762 nodes
39315 elements
Unit: m
With solid (3D) elements
------------------------------
DPF Time/Freq Support:
Number of sets: 3
Cumulative Time (s) LoadStep Substep
1 1.000000 1 1
2 2.000000 1 2
3 3.000000 1 3
Extract displacement data#
提取整个网格和外层的位移数据
displacement_ext = simulation.displacement(external_layer=True)
displacement = simulation.displacement() # default is `external_layer=False`
displacement_ext.plot()
displacement.plot()
print(
f"number of nodes with `external_layer=True`: {len(displacement_ext.index.mesh_index)}"
)
print(
f"number of nodes with `external_layer=False`: {len(displacement.index.mesh_index)}"
)
number of nodes with `external_layer=True`: 64079
number of nodes with `external_layer=False`: 69762
Extract stress/strain data#
提取应力/应变数据
提取整个网格和外层的应力或弹性应变数据。 由于保持单元的连通性不变,因此可以很容易地在外部层上进行平均和不变量计算。
elemental_stress_ext = simulation.stress_principal_elemental(
components=[1], external_layer=True
)
elemental_stress = simulation.stress_principal_elemental()
elemental_stress_ext.plot()
elemental_stress.plot()
print(
f"number of elements with `external_layer=True`: {len(elemental_stress_ext.index.mesh_index)}"
)
print(
f"number of elements with `external_layer=False`: {len(elemental_stress.index.mesh_index)}"
)
elastic_strain_eqv_ext = simulation.elastic_strain_eqv_von_mises_nodal(
external_layer=True
)
elastic_strain_eqv = simulation.elastic_strain_eqv_von_mises_nodal()
elastic_strain_eqv_ext.plot()
elastic_strain_eqv.plot()
number of elements with `external_layer=True`: 31374
number of elements with `external_layer=False`: 39315
Total running time of the script: (0 minutes 3.428 seconds)





