Re: [sparta-users] Surface mesh units

[Zuheyr A. <zuh...@vk...>]

Dear Cosimo,

I am so glad to hear from you.

These are different (as far as I can understand):
1-my problems arise because my 3D mesh comprises several objects that I need to create a CAD file separately for each and then mesh and assemble. If these assembled meshes are "too close" Sparta things these are overlapping and errors out. The solution is to gap these parts farther apart then a typical mesh cell about the gap.
This is sometimes violating the physics. Like making the bottom of your coffee cup standing 1mm off the rest of the cup 🙂

Now try to solve this by assembling all the cad files without the gaps​*through scripting and then meshing the exported singe CAD as a single volume. Sparta at least reads the mesh this way.  I am trying to do this now.

2-Sometimes in early run time it crashes probably due to just bad luck, I think developers can explain. You never know. I solved this just by changing the grid cells just by one or so. ...

Take care.
Best,
Zuheyr


Dr. Zuheyr Alsalihi
Senior Research Eng.
von Karman Institute
72, Chee. de Waterloo
1640 Rhode-St-Genese, Belgium.
+32 359 98 65
________________________________
From: Cosimo Livi <cos...@as...>
Sent: Monday, February 14, 2022 1:15 PM
To: Zuheyr Alsalihi <zuh...@vk...>; spa...@li... <spa...@li...>
Subject: RE: Surface mesh units


Hi Zuheyr,



About this:

“I always have this problem of cut3d failing or overlapping triangles but this is another thing.”

Does it happen to you immediately after reading the surfaces, or at some point in the run?
I think it happened to me as well during a simulation, and I was unable to understand the source of it.

Bests,

Cosimo





From: Zuheyr Alsalihi <zuh...@vk...>
Sent: Sunday, February 13, 2022 12:12 PM
To: Cosimo Livi <cos...@as...>; spa...@li...
Subject: Re: Surface mesh units



CAUTION: This message is from an external sender

Dear Cosimo,



Yes, it is reading correctly I presume it defines the min, max of the piece correctly.

I always have this problem of cut3d failing or overlapping triangles but this is another thing.

If it could just tell where that would be already better.



Thank you to you!



Best wishes,

Zuheyr



Dr. Zuheyr Alsalihi

Senior Research Eng.

von Karman Institute

72, Chee. de Waterloo

1640 Rhode-St-Genese, Belgium.

+32 359 98 65

________________________________

From: Cosimo Livi <cos...@as...<mailto:cos...@as...>>
Sent: Sunday, February 13, 2022 11:54 AM
To: Zuheyr Alsalihi <zuh...@vk...<mailto:zuh...@vk...>>; spa...@li...<mailto:spa...@li...> <spa...@li...<mailto:spa...@li...>>
Subject: RE: Surface mesh units



Hi Zuheyr,



Is it works 😊

I have the same problem and it works perfectly after scaling in the read_surf command.

Cheers,

Cosimo



From: Zuheyr Alsalihi <zuh...@vk...<mailto:zuh...@vk...>>
Sent: Saturday, February 12, 2022 10:06 PM
To: spa...@li...<mailto:spa...@li...>
Subject: [sparta-users] Surface mesh units



CAUTION: This message is from an external sender

Dear colleagues, Sparta Developers,



I normally always work with CAD models in meters. But this time I have surface mesh in milimeters.



In the read_surf command I can specify 3 scales Sx,Sy,Sz as 0.001, 0.001, and 0.001. Then continue as if the mesh is in meters.

Am I right? To get Sparta run on a 3D model is always a big struggle for me, I just want to be sure if I am right. As I usually need to struggle to get Sparta run on complex 3D surface models.



Thank you for reading.



Best regards,

Zuheyr





Dr. Zuheyr Alsalihi

Senior Research Eng.

von Karman Institute

72, Chee. de Waterloo

1640 Rhode-St-Genese, Belgium.

+32 359 98 65

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-- The information contained in this communication and any attachments is confidential and may be privileged, and is for the sole use of the intended recipient(s). Any unauthorized review, use, disclosure or distribution is prohibited. Unless explicitly stated otherwise in the body of this communication or the attachment thereto (if any), the information is provided on an AS-IS basis without any express or implied warranties or liabilities. To the extent you are relying on this information, you are doing so at your own risk. If you are not the intended recipient, please notify the sender immediately by replying to this message and destroy all copies of this message and any attachments. Neither the sender nor the company/group of companies he or she represents shall be liable for the proper and complete transmission of the information contained in this communication, or for any delay in its receipt. -- The information contained in this communication and any attachments is confidential and may be privileged, and is for the sole use of the intended recipient(s). Any unauthorized review, use, disclosure or distribution is prohibited. Unless explicitly stated otherwise in the body of this communication or the attachment thereto (if any), the information is provided on an AS-IS basis without any express or implied warranties or liabilities. To the extent you are relying on this information, you are doing so at your own risk. If you are not the intended recipient, please notify the sender immediately by replying to this message and destroy all copies of this message and any attachments. Neither the sender nor the company/group of companies he or she represents shall be liable for the proper and complete transmission of the information contained in this communication, or for any delay in its receipt.