Modify the size of the mesh region

[aknsj]

Hi, In the process of building a thermal simulation model, I am using the pyaedt script, which gives me a positive loop feedback to my work.
I am using the following script to assign mesh region.

mesh_object_list = ipk.modeler.solid_names
mesh_object_list.remove("Region")
mesh_region = ipk.mesh.assign_mesh_region(objectlist=mesh_objectlist)

But there is a small problem with this. This problem is that the mesh region fits tightly to the solid as shown below.

My requirement is to increase the size of the mesh region slightly, which is good for the mesh quality. In terms of specific parameter changes, firstly, the X, Y, and Z positions are each reduced by 0.1mm. Secondly, XSize, YSize, and ZSize are each increased by 0.2mm.

These parameter changes achieve the results I want as shown below.

The version of pyaedt I am using is 0.9.2. I would be very happy to know what script would enable the modification of the mesh region size. Looking forward to your reply!

[lorenzovecchietti]

You can change settings from the mesh_region object.
You can switch between manual or automatic mesh settings using:

mesh_region.manual_settings = True
mesh_region.manual_settings = False

To print the settings available:

mesh_region.settings

That line will print out one of the two dictionaries:

• {'EnforceCutCellMeshing': False, 'StairStepMeshing': False, 'OptimizePCBMesh': True, 'CurvatureSizeFunction': True, 'EnableTransition': False, 'Enforce2dot5DCutCell': False, 'Enable2DCutCell': False, 'ProximitySizeFunction': True, 'MeshRegionResolution': 3}
• {'2DMLMType': '2DMLM_None', 'EnableMLM': True, 'EnforceCutCellMeshing': False, 'MinGapX': '1mm', 'NoOGrids': False, 'MaxElementSizeY': '0.02mm', 'StairStepMeshing': False, 'UniformMeshParametersType': 'Average', 'MinGapZ': '1mm', 'CurvatureSizeFunction': True, 'EnableTransition': False, 'MaxElementSizeX': '0.02mm', 'EnforeMLMType': '3D', 'MinElementsInGap': '3', 'MinElementsOnEdge': '2', 'OptimizePCBMesh': True, 'BufferLayers': '0', 'MaxElementSizeZ': '0.03mm', 'MaxSizeRatio': '2', 'MaxLevels': '0', 'MinGapY': '1mm', 'Enforce2dot5DCutCell': False, 'Enable2DCutCell': False, 'ProximitySizeFunction': True}

As an example:

mesh_region.settings["MaxElementSizeX"] = "2mm"
mesh_region.settings["MaxElementSizeY"] = "2mm"
mesh_region.settings["MaxElementSizeZ"] = "2mm"
mesh_region.settings["EnableMLM"] = True
mesh_region.settings["MaxLevels"] = "2"
mesh_region.settings["MinElementsInGap"] = 4
mesh_region.update()

[aknsj]

Thanks for your reply, I can successfully change the mesh element size by mesh_region.setting, such as “MaxElementSizeX”. But I still want to know which parameter can change the mesh region size, thanks!

[lorenzovecchietti]

You should be able to do something like:

mesh_region.assignment. positive_x_padding_type = "Absolute Position"
mesh_region.assignment. positive_x_padding = "3mm"

See all the properties of the subregion class from the documentation or from here:

pyaedt/pyaedt/modules/MeshIcepak.py

Line 17 in 99f7471

class CommonRegion(object):

[aknsj]

Thanks for your reply.I used the following code to assign the mesh region.

mesh_objectlist = ipk.modeler.solid_names
mesh_objectlist.remove("Region")
mesh_region = ipk.mesh.assign_mesh_region(assignment=mesh_objectlist)
mesh_region.manual_settings = True
mesh_region.settings["MaxElementSizeX"] = "3mm"
mesh_region.settings["MaxElementSizeY"] = "3mm"
mesh_region.settings["MaxElementSizeZ"] = "1mm"
mesh_region.settings["MinGapX"] = "0.01mm"
mesh_region.settings["MinGapY"] = "0.01mm"
mesh_region.settings["MinGapZ"] = "0.01mm"
mesh_region.settings["MaxLevels"] = "3"
mesh_region.settings["MinElementsInGap"] = 1
mesh_region.settings["EnableMLM"] = True
mesh_region.update()

But while modifying the mesh region size using the following code, the following error occurs.

mesh_region.assignment.positive_x_padding_type = "Absolute Position"
mesh_region.assignment.positive_x_padding = "3mm"

err: 'list' object has no attribute 'positive_x_padding_type'

[lorenzovecchietti]

Hi, what AEDT version are you using?
The procedure should work on 24R1.
If you are using an old version, please try to access directly the non-model object that defines the mesh region:

region_box=icepak.modeler["Box2"]
h=region_box.history()
h.props["XSize"]="10mm"

[aknsj]

Hi, I was previously using AEDT version 2022R2, I upgraded to version 2024R1 and tested these scripts below. I successfully changed the mesh region size. Thanks a lot!

mesh_region.assignment.positive_x_padding_type = "Absolute Position"
mesh_region.assignment.positive_x_padding = "3mm"