FDS-EVAC compatibility with commerical CFD software (CCM+, CFX, etc) for pedestrian modeling

[SD]

Hi,

I am pretty new to using FDS-evac. But, I would lilke to use FDS-EVAC for pedestrian egress modeling.

Can anybody tell me if FDS-EVAC work if the CFD model is done in either STAR-CCM+ or ANSYS-CFX? 

What input files does FDS-EVAC need for its modeling? Can these inputs be exported as output froms CCM+ or CFX?

Any help would be greatly appreciated.

Thanks,
Sai

[Salah Benkorichi]

FDS-EVAC in itself is a CFD model, you can model your fire and plume while using evacuation in the main time. 

Check the manual guides and some cases to understand how it works.

http://virtual.vtt.fi/virtual/proj6/fdsevac/documents/FDS+Evac_textbased_homepage.txt

Check FDS Manuals for more information.

https://pages.nist.gov/fds-smv/manuals.html

2) As far as I know you can't export Ansys data back to FDS unless you make a code for it.

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[Salah Benkorichi]

Just curious, 

What are in the other packages that you think FDS can't do? Structural analysis for example?

[SD]

Thanks Salah. I have used FDS but never used FDS-EVAC before. I couldnt understand the big picture when I looked at the examples for fds-evac. Thanks for sending those links. I am going to explore more.

I am modeling a curved tunnel that is difficult to model in FDS. The only pedestrial model I am familiar is STEPS which takes VRML files from CFD simulation (CCM+ say) and uses this information to egress evacuees whose movement is affected by visibility of smoke. VRML files are essentially 3d images that provide smoke information in space. I am trying to something similar, but I want to see FDS-EVAC can do this instead of using STEPS. 

The motivation to use CCM+ instead of FDS is mainly to model the curved geometry better (the physics itself can be handled by FDS pretty well). and also better graphics. 

Your thoughts are much appreciated.

Regards,

Sai

On Monday, October 16, 2017 at 5:18:24 PM UTC-7, Salah Benkorichi wrote:

Just curious, 

What are in the other packages that you think FDS can't do? Structural analysis for example?

On 17 Oct 2017 12:56 am, "Salah Benkorichi" <benkori...@gmail.com> wrote:

FDS-EVAC in itself is a CFD model, you can model your fire and plume while using evacuation in the main time. 

Check the manual guides and some cases to understand how it works.

http://virtual.vtt.fi/virtual/proj6/fdsevac/documents/FDS+Evac_textbased_homepage.txt

Check FDS Manuals for more information.

https://pages.nist.gov/fds-smv/manuals.html

2) As far as I know you can't export Ansys data back to FDS unless you make a code for it.

On 17 Oct 2017 12:17 am, "SD" <sai....@gmail.com> wrote:

Hi,

I am pretty new to using FDS-evac. But, I would lilke to use FDS-EVAC for pedestrian egress modeling.

Can anybody tell me if FDS-EVAC work if the CFD model is done in either STAR-CCM+ or ANSYS-CFX? 

What input files does FDS-EVAC need for its modeling? Can these inputs be exported as output froms CCM+ or CFX?

Any help would be greatly appreciated.

Thanks,
Sai

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[TimoK]

Hi!

FDS+Evac is just a module of FDS. It is included in the same executable (the ".exe" file in DOS and its successors).
So, you use the same input file as for the FDS fire simulation (the ".fds" file). There are just some special keywords
in the input file (which is a text file) that makes the FDS also to calculate evacuation.

FDS+Evac can use the smoke information calculated by FDS. Actually, it would be quite ease to use also
smoke information calculated by some other CFD fire simulation code, but for this you need to write
a small (Fortran) computer program to transfer the other CFD smoke output file to the format that
FDS+Evac understands. The file format for the FDS+Evac smoke file ("_evac.fed") is quite simple, so
this kind of small data transfer program should be quite easy to do.

TimoK

[SD]

Thanks TimoK for your help as well. 

If the geometry itself was built in an external software(say CCM+), can it be imported into fds-evac or does it have to be rebuilt in fds-evac (using fds modules)? Can the walking speed of people be varied as a function of smoke visibility easily in fds-evac?

Thanks,
Sai

[TimoK]

Well, the FDS+Evac geometry is done similarly as the FDS fire simulation geometry.
There are some third party tools that you can use to convert CAD files to FDS obstacles.
And there are some other programmes (free of charge of you should pay) like BlenderFDS
and Pyrosim, that can be used to make the FDS input geometry starting with CAD files.
These programmes can also start "from scratch", i.e., you can use them to draw the geometry
(or at least I think that they can do this).

Yes, the walking speed is modified by the visibility. See the FDS+Evac manual, chapter:
3.4 Fire and Human Interaction. And you could search this forum (and the FDS issue tracker
in GitHub) to find some other information on the speed vs smoke in FDS+Evac. Not all the
possible inputs are described in the manual. There are some "new" additions that are not
yet documented (nor verified/validated).

TimoK