thin obstruction error

[rakeshra...@gmail.com]

Hello everyone!

I am getting an error of 'SURF cannot be applied to a thin obstruction'  even though the obstruction is 1 cell thick. How to deal with this error? 

Thank you.

Regards,

Rakesh

[Salah Benkorichi]

Maybe the surf is applied to another thin obstacles that is less than 1cell thick. Put on the obst lines THICKNESS=T

Verify the spelling as I don't have the UG at hand.

Sent from my phone

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From: fds...@googlegroups.com <fds...@googlegroups.com> on behalf of rakeshra...@gmail.com <rakeshra...@gmail.com>
Sent: Wednesday, June 20, 2018 7:07:04 AM
To: FDS and Smokeview Discussions
Subject: [fds-smv] thin obstruction error

 

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[Rakesh Ranga]

I tried &MISC THICKEN_OBSTRUCTIONS=.TRUE. /

It is still giving the same error....

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[Salah Benkorichi]

Upload a simplified case , I will take a look.

Sent from my phone

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From: fds...@googlegroups.com <fds...@googlegroups.com> on behalf of Rakesh Ranga <rakeshra...@gmail.com>
Sent: Wednesday, June 20, 2018 7:16:04 AM
To: fds...@googlegroups.com
Subject: Re: [fds-smv] thin obstruction error

 

To view this discussion on the web visit https://groups.google.com/d/msgid/fds-smv/CAG3uxTDjNuxLJ8igX_t-3hd2yO60KCaq%3DCGu8jcRUtKsZgi6eg%40mail.gmail.com.

[rakeshra...@gmail.com]

Please find attached the case. The thickness of the thin obstruction is 0.16 mm. So I wanted to have 0.16 mm cells near the obstruction and gradually increase the size away from the paper.

[dr_jfloyd]

You have a complicated and inefficient meshing strategy. Each mesh is solved independently and having only a handful of cells across each mesh isn't going to give a good solution. this is probably also causing issues with assigning surfaces. You also have high aspect ratios in some of the meshes. Given that you would only need ~230x2200 cells to cover the mesh at the smallest grid resolution, I suggest just using a uniform grid resolution. If you want to take advantage of MPI, first split vertically (MPI is more efficient when meshes have small aspect ratios).

[Rakesh Ranga]

Thank you.

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