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#1 |
New Member
Nilanka Ekanayake
Join Date: Jun 2017
Posts: 9
Rep Power: 9 ![]() |
Hi,
I got a step file with a sphere inside a channel. But when I import as a database the following step file, the internal surfaces (sphere) won't import properly in Pointwise. Are there any properties that I should change when importing such file? |
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#2 |
Senior Member
David Garlisch
Join Date: Jan 2013
Location: Fidelity Pointwise, Cadence Design Systems (Fort Worth, Texas Office)
Posts: 307
Rep Power: 14 ![]() |
Can you attach the file?
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#3 |
New Member
Nilanka Ekanayake
Join Date: Jun 2017
Posts: 9
Rep Power: 9 ![]() |
Sorry, the file is attached.
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#4 |
Senior Member
David Garlisch
Join Date: Jan 2013
Location: Fidelity Pointwise, Cadence Design Systems (Fort Worth, Texas Office)
Posts: 307
Rep Power: 14 ![]() |
I am fairly sure this STEP file is bad.
If you look at the appropriate section in the STEP file, you will see that the sphere (entity #352) is used as part of a face (entity #347). Code:
#345 = ORIENTED_CLOSED_SHELL('',*,#346,.F.); #346 = CLOSED_SHELL('',(#347)); #347 = ADVANCED_FACE('',(#348),#352,.T.); #348 = FACE_BOUND('',#349,.T.); #349 = VERTEX_LOOP('',#350); #350 = VERTEX_POINT('',#351); #351 = CARTESIAN_POINT('',(2.5,1.,0.9)); #352 = SPHERICAL_SURFACE('',#353,0.1); #353 = AXIS2_PLACEMENT_3D('',#354,#355,#356); #354 = CARTESIAN_POINT('',(2.5,1.,1.)); #355 = DIRECTION('',(0.,0.,1.)); #356 = DIRECTION('',(1.,0.,0.)); This nonsensical entity is discarded during import. The sphere is located at (2.5, 1, 1) with a radius of 0.1. I have attached several files with this sphere added back in. The pw file was created with V18.0R3. If your Pointwise version is older and it can't read the pw file, import the NMB database file. If that won't work, import the IGES file. |
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#5 |
New Member
Nilanka Ekanayake
Join Date: Jun 2017
Posts: 9
Rep Power: 9 ![]() |
Many thanks.
I've been able to open the .pw ! Did you create the geo directly in pw using shapes? I had some trouble when placing the sphere in the correct location using the translation tool. I'll try point placement option. The geometry I actually created is a channel flow, with a spherical portion removed from it (using a boolean operation). May be that would have been the issue. Again thank. |
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#6 | ||
Senior Member
David Garlisch
Join Date: Jan 2013
Location: Fidelity Pointwise, Cadence Design Systems (Fort Worth, Texas Office)
Posts: 307
Rep Power: 14 ![]() |
Quote:
In the task panel:
By default, the sphere is aligned to the current view, if the alignment is important, you can change it using the various buttons in the Mode section. Quote:
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#7 |
New Member
Nilanka Ekanayake
Join Date: Jun 2017
Posts: 9
Rep Power: 9 ![]() |
Thank you.
Again, If I need to create a sphere with a 0.0001 radius (in m scale directly) how to do it since the minimum allowable length is 0.002. Anything to do with the tolerance? Another problem related to boundary layer thickness adjustment in T-Rex. I would like to have different meshes with several boundary layers. But when I apply T-rex for the block, I am not sure which parameters that I should use to vary those. The Max. Layers/Full layers didn't help me much to specify the required boundary layer thickness. Compressed .pw that I am working is exceeding the size, hence uploaded the STEP file that I am using. |
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#8 |
Senior Member
David Garlisch
Join Date: Jan 2013
Location: Fidelity Pointwise, Cadence Design Systems (Fort Worth, Texas Office)
Posts: 307
Rep Power: 14 ![]() |
As with all computer floating point calculations, there is a finite dynamic range that can be represented internally before numerical round off errors start to erode the integrity of calculations. For Pointwise, this range is around seven orders of magnitude. That is, to get meaningful calculations:
SmallestValue >= LargestValue / 10e7Pointwise has a setting called Model Size that defaults to 1000 units. So the smallest value would be around 1000/10e7 == 0.0001. The Model Size drives the precision supported for all grid and database options. However, it doesn't stop there. In a typical mesh, the grid entities are usually several orders of magnitude smaller than the database surfaces they are attached to! So, to help prevent unintended numerical problems, various values (such as sphere radius) are limited (in the GUI only) to ranges compatible with the Model Size. To be specific:
For most applications the default works fine. However, if your grid is going to have "very small" details such as a sphere with a 0.0001m radius, or very small initial grid spacing, the Model Size will need to be adjusted to a smaller value. The Model Size will need to be set to 10.0 or less to get the numerical precision necessary for a radius of 0.0001. It will also help overall precision, if you keep all database and grid entities centered around the global origin as much as possible. Building a mesh centered at (10e3, 10e3, 10e3) will waste numerical precision. The Model Size value should be set BEFORE any grid or database entities are created or imported using File, Properties.... Also, there are Model Size options available when CAD file is imported into an empty file. Please see the user manual or GUI help for details. I hope this helps. Last edited by dgarlisch; September 7, 2017 at 15:12. |
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#9 |
Senior Member
David Garlisch
Join Date: Jan 2013
Location: Fidelity Pointwise, Cadence Design Systems (Fort Worth, Texas Office)
Posts: 307
Rep Power: 14 ![]() |
As for your TRex questions, I will leave that to the grid experts on this forum. A club of which I am not a member.
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#10 |
New Member
Join Date: Mar 2023
Posts: 1
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I am trying to mesh my model using pointwise. But when I import it in pointwise, the pointwise couldn't import all surfaces of my model. (Its the aircraft model and the pointwise couldn't import the surface around pod). Is here anyone who can help me to solve this problem?
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Tags |
importing step files, pointwise |
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