Oil storage tank fire

[pradeep kumar]

Dear all,

Attached is a model of oil storage tank, specifically diesel.The cubes inside the tank you see represent diesel.

We need to simulate the attached model for fire in open air conditions.

I did refer to Section 9.4: Special Topic: Fires and flows in the outdoors. But it is not clear as to how to specify the wind velocity. 

Can anyone please help?

Also, the model of the tank I have made has the lid closed. My understanding is that, for the fire to spread the lid has to be open or rather the fluid has to be exposed to air. How do I achieve this?

And, how do I make the fire spread from one tank to another tank?

Thanks and regards

Deepa / Pradeep 

[Peter]

Hi Pradeep,

Whilst not an expert in this field I have a couple of suggestions.

The wind velocity outside it affected by boundary conditions and so
need to be specified appropriately to ensure you get a reasonable
profile. The atmospbheric profile can be utilised here. This is
similar to internal forced flows, the boundary effects of obstructions
need to develop otherwise the flow regime is incorrect.

There is more information in the thread:

http://groups.google.com/group/fds-smv/browse_thread/thread/b5819297fdf6040a#

In addition when specifying the external flow you will need to delay
the start of the fire. If you use a boundary condition in the model
the true flow regime through your tankfarm will not have time to
develop. The fire may act as a 'choke' and affect the ability of the
wind regime to develop. Running the wind regime to develop first,
either in the simulation or through an 'INIT' file will give better
results. I have seen particularly urban canyon simulations alter
massively with and without initial wind flow regimes.

In terms of making the fire spread from one tank to the other you must
first determine the mode of fire spread in reality and then determine
if FDS can simulate those. If the diesel is in fully enclosed tanks
what is your mechanism for fire spread? Some sort of tank failure?
Remember the model has limitations and so you must fundamentally
understand whether what you are trying to simulate is feasible.

>  DIESEL_TANK_FIRE.fds
> 2468KViewDownload

[Peter]

The other thing you'll need to do is open the boundaries that do not
define the wind as currently you have oil storage tanks in a box.
This will require a significantly higher domain and mesh to allow for
the smoke rising and being affected buy the wind.

On Apr 12, 4:19 pm, Peter <pete.c...@btinternet.com> wrote:
> Hi Pradeep,
>
> Whilst not an expert in this field I have a couple of suggestions.
>
> The wind velocity outside it affected by boundary conditions and so
> need to be specified appropriately to ensure you get a reasonable
> profile.  The atmospbheric profile can be utilised here.  This is
> similar to internal forced flows, the boundary effects of obstructions
> need to develop otherwise the flow regime is incorrect.
>
> There is more information in the thread:
>

> http://groups.google.com/group/fds-smv/browse_thread/thread/b5819297f...

> > 2468KViewDownload- Hide quoted text -
>
> - Show quoted text -

[Ajay Ambhorkar]

I am getting an error message could you help me?

Problem with MATL 3, line number  19287 (CHID:  DIESEL_TANK_FIRM)

Do you have any updated files on tank farm? 

Ajay

[dr_jfloyd]

4.2 Common Error Statements

An FDS calculation may end before the specified time limit. Following is a list of common error statements
and how to diagnose the problems:

Input File Errors: The most common errors in FDS are due to mistyped input statements. These errors
result in the immediate halting of the program and a statement like, “ERROR: Problem with the HEAD
line.” For these errors, check the line in the input file named in the error statement. Make sure the
parameter names are spelled correctly. Make sure that a / (forward slash) is put at the end of each
namelist entry. Make sure that the right type of information is being provided for each parameter, like
whether one real number is expected, or several integers, or whatever. Make sure there are no non-ASCII
characters being used, as can sometimes happen when text is cut and pasted from other applications or
word-processing software. Make sure zeros are zeros and O’s are O’s. Make sure 1’s are not !’s. Make
sure apostrophes are used to designate character strings. Make sure the text file on a Unix/Linux machine
was not created on aWindows machine, and vice versa. Make sure that all the parameters listed are still
being used – new versions of FDS often drop or change parameters forcing you to re-examine old input
files.

[Ajay Ambhorkar]

No luck checked for input error, could you try the attached file on diesel tank and guide me appreciate your time and help.

Ajay

[Kevin]

The input file is out of date. 

[mc tang]

set a new surface, the type should be "fan" and then there will be wind  velocity  setting.

Then set the surface for the boundary.

I wonder how to post here please,  thank you！