FDS over WFDS

[Ankit Patil]

What are the main advantages of FDS over WFDS in case of fire spread over vegetation? Which one is better nowadays?  Can anyone tell me with reference?

[Khalid Moinuddin]

We have extensively used WFDS in our recent studies. It is computationally much less expensive than FDS and we have well-established validation cases with proper convergence studies.

 

However, FDS has many more features such as &GEOM, VLES & SVLES turbulence model, MOST etc. Moreover, for grassfires, it does not rely on a “maximum MLR”. Therefore, we are currently trialing FDS. If we find that, the computational cost is prohibitive, we will keep using WFDS.

 

 

 

From: fds...@googlegroups.com <fds...@googlegroups.com> On Behalf Of Ankit Patil
Sent: Tuesday, 11 April 2023 11:18 PM
To: FDS and Smokeview Discussions <fds...@googlegroups.com>
Subject: [fds-smv] FDS over WFDS

 

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What are the main advantages of FDS over WFDS in case of fire spread over vegetation? Which one is better nowadays?  Can anyone tell me with reference?

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[dr_jfloyd]

The WFDS executable is based on a deprecated version of FDS. It does not include many bug fixes inlcuding fixes to heat transfer and solid phase reactions. I would strongly recommend using the current release of FDS and follow the User Guide example for defining WUI inputs for the current release of FDS.

[Kevin McGrattan]

You can define volumes within the computational domain and obtain HRR within each. But these are non-moving volumes. There is no clear distinction between head and flank HRR.

On Thu, Apr 13, 2023 at 6:39 AM Ankit Patil <patilank...@gmail.com> wrote:

Sure sir,

Is it possible to get values of HRR of flank fire and head fire in FDS? Like I have attached fds file about C064 expt of  grassland fire 

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