construction with small air layer doesn't run

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stergiani
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construction with small air layer doesn't run

Post by stergiani » Tue Nov 21, 2017 1:37 am -1100

Hei,

I need to simulate a roof construction where wood beams have been screwed together.
For that reason, I have build an element that in between the wooden parts, there are very small air gaps 0.1mm, but the simulation doesn't seem to work and I just get an empty convergence analyzer.
If I run it without the air gaps, the simulation runs and converges properly.
Could it be that such small air gaps create numerical problem and does not allow the simulation to converge? Or is it something else I can check?
Thank you in advance

Regards,
Stergiani

Manfred Kehrer
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Re: construction with small air layer doesn't run

Post by Manfred Kehrer » Tue Nov 21, 2017 3:07 am -1100

Hi Stergiani,
please only use thicknessess >= 1mm in WUFI 2D. you may need to adapt, the mue value (perm in) to receive the desired sd value (perm).
Manfred
Wiss, Janney, Elstner Associates, Inc.
Official WUFI® Collaboration Partner for USA/Canada
Enjoy WUFI® :) .... It is easy and complex.

stergiani
WUFI User
WUFI User
Posts: 6
Joined: Fri Jul 08, 2016 12:35 am -1100

Re: construction with small air layer doesn't run

Post by stergiani » Tue Nov 21, 2017 3:26 am -1100

Thanks for your reply
What would you think would be the best way to simulate wooden beams that are screwed together?
Cause I try to study the difference between using screwed beams together, instead of opaque wooden material
Thank you in advance

Stergiani

Manfred Kehrer
WUFI International Support Team
WUFI International Support Team
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Re: construction with small air layer doesn't run

Post by Manfred Kehrer » Tue Nov 21, 2017 3:49 am -1100

I would use a WUFI Pro simulation to figure out if the 0.1 mm air gap you intend to create does have an impact on the results. Likely not which then make it easier for you to set up your 2D model.
The screws my have an impact though
Manfred
Wiss, Janney, Elstner Associates, Inc.
Official WUFI® Collaboration Partner for USA/Canada
Enjoy WUFI® :) .... It is easy and complex.

stergiani
WUFI User
WUFI User
Posts: 6
Joined: Fri Jul 08, 2016 12:35 am -1100

Re: construction with small air layer doesn't run

Post by stergiani » Tue Nov 21, 2017 4:05 am -1100

Thanks :)
I'll give it a shot

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