National Institute of Standards and Technology (NIST): Fire Dynamics Simulator (FDS) and Smokeview (SMV)

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National Institute of Standards and Technology (NIST): Fire Dynamics Simulator (FDS) and Smokeview (SMV)

Δημοσίευσηαπό Προέλλην » 07 Απρ 2025, 23:59


The total amount of silicone oil is 200 kg. Droplets of constant diameter are injected in different directions over a course of 4 s with a prescribed velocity. Ignition of the droplets is achieved by setting a high temperature in the surrounding surfaces for a short period of time period (0.3 s). The video shows the heat release per unit volume (200 kW/m3) and the soot. The computational domain has dimensions of 160 m x 160 m x 160 m. The resulting maximum diameter of the silicone oil fireball is on the order of 80 m.




The total amount of silicone oil is 100 kg. Droplets of constant diameter are injected in different directions over a course of 4 s with a prescribed velocity. Ignition of the droplets is achieved by setting a high temperature in the surrounding surfaces for a short period of time period (0.3 s). The video shows the 3D smoke - temperature. The computational domain has dimensions of 160 m x 160 m x 160 m. The resulting maximum diameter of the silicone oil fireball is on the order of 50 m.




The total amount of silicone oil is 200 kg. Very coarse droplets of constant diameter (4000 microns) are injected in different directions over a course of 4 s with a prescribed high velocity. Ignition of the droplets is achieved by setting a high temperature in the surrounding surfaces for a short period of time period (0.3 s). The video shows the 3D smoke - temperature. The computational domain has dimensions of 160 m x 160 m x 160 m. The resulting maximum diameter of the silicone oil fireball is on the order of more than 80 m.




The total amount of silicone oil is 200 kg. Coarse droplets of constant diameter (2000 microns) are injected in different directions over a course of 5 s with a prescribed high velocity. Ignition of the droplets is achieved by setting a high temperature in the surrounding surfaces for a short period of time period (0.1 s). The video shows the 3D smoke - temperature. The computational domain has dimensions of 200 m x 200 m x 150 m.




The total amount of silicone oil is 250 kg. Coarse droplets of constant diameter (2000 microns) are injected in five different directions over a course of 5 s with a prescribed velocity (on the order of 30 m/s). Ignition of the droplets is achieved by setting a high temperature (10000 C) in a surrounding surface for a short period of time period (0.2 s) essentially trying to emulate an electric arc event. The AIT of silicone oil is set to 350 C. The video shows the 3D smoke - HRRPUV. The computational domain has dimensions of 200 m x 200 m x 200 m.



https://pages.nist.gov/fds-smv/
https://en.wikipedia.org/wiki/Fire_Dynamics_Simulator
https://www.nist.gov


Θα ξεβλαχέψετε θέλετε δεν θέλετε :asd03:
0 .
Hätt ich ne 2te Chance würd ich es genauso machen
Ich dreh mich nich um es geht nur darum wer du heute bist
Ich bin zufrieden, da scheint jemand auf mich aufzupassen
Ob es für Gott oder den Teufel is
Ich bereue nichts

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Re: National Institute of Standards and Technology (NIST): Fire Dynamics Simulator (FDS) and Smokeview (SMV)

Δημοσίευσηαπό Προέλλην » 08 Απρ 2025, 00:34

Τα βίντεο έχουν ημερομηνία απο αρχές Μαρτίου μέχρι και χθές.

@bomberman0r
2 weeks ago
Is this a collaboration simulation with NTUA?

@pyr-fire
2 weeks ago
No it's not.

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@bomberman0r
2 weeks ago
@ is it a Tempi event simulation?

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@pyr-fire
2 weeks ago
@bomberman0r No, just inspired by it.


Apologies for asking this in a YouTube comment, but I’m assuming you’re simulating the conditions of the Tempi train crash.
There’s a lot of conflicting information in the media about this, and it seems like a deep level of expertise is needed to fully understand what happened.
Based on your simulations, can we reasonably conclude that silicon oils are the likely cause of the fireball, or would a more thorough investigation be required to reach a definitive answer?

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@pyr-fire
16 hours ago
No, I would not be so fast as to say that silicone oil was the cause. I think you definitely you need a more thorough investigation on this.

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@_zisis
6 hours ago
​ @pyr-fire Thanks for the clear response. Unfortunately, the media is quite misleading, often featuring mostly lawyers and low-quality journalists trying to explain technical matters.

FIY: you'll likely be a hot topic in the Greek media over the coming days and weeks. Best of luck with that!

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@pyr-fire
5 hours ago
@_zisis Not something I wanted to, to be honest, but I just felt the obligation to express my scientific opinion on the matter.


Απ ότι καταλαβαίνω, στέλνει μήνυμα ότι βάσει συγκεκριμένου μοντέλου μια χαρά γίνεται δυνητικά ανάφλεξη και fireball 80μ απο έλαια σιλικόνης ανάλογης ποσότητας. Όντας όμως προφανώς επιστήμονας και όχι αλμπάνης λέει ότι μια τέτοια προσομοίωση απο μόνη της δεν αρκεί για να καταλήξεις με βεβαιότητα για την αιτία, και ότι τα πράγματα είναι εξαιρετικά πιο σύνθετα :dunno:
0 .
Hätt ich ne 2te Chance würd ich es genauso machen
Ich dreh mich nich um es geht nur darum wer du heute bist
Ich bin zufrieden, da scheint jemand auf mich aufzupassen
Ob es für Gott oder den Teufel is
Ich bereue nichts


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