The NFRAMES parameter controls the rate at which output files are written. We will add the following line right after the TIME one: The line will instruct FDS to end the simulation at 60 s. The duration of the simulation we will use the &TIME parameter: Setting up the duration of the FDS simulation In our simulation we want to have 0.1 m cubes, so we deduced the IJK values by dividing each dimension by 0.1 m.Ĥ m / 0.1 m = 40 -> n(y)= 40 -> IJK= 30, 40, 30 2.3. The IJK command specifies the number of parts in which you want to divide the three dimensions (x, y, z), in the format of IJK= n(x), n(y), n(z). Definition of the geometry in the FDS enviroment The XB command defines the dimensions of the volume in meters, in the format of XB= x, x’, y, y’, z, z’. The volume is a parallelepiped defined by its 2 opposites corners the coordinates of the first point are x, y, z the second ones are x’, y’, z’. That defines the domain is the following:
The grid in which our simulation will take place:Īlready know, FDS needs to operate within a domain that is made up ofįor our FDS simulation, we will divide our 3 x 4 x 3 m domain into cubes with 0.1 m side. The rest of the FDS input file will be written between the &HEAD CHID line and the &TAIL line, as shown in the picture below. Press enter a few times and write the ending string of the file, which is the same for every FDS job: The first thing to do when setting up an input file is to give the job a name (it’s convenient to use the same name as the input file): you have to name the job by writing the following string at the very beginning of the file: fds file with a text editor ( Notepad on Windows). The extension of the file will need to be “.fds”, not “.txt”, so make sure to change it. We will use the name “job1” for this tutorial. Navigate to an empty folder, then create a new document by: The first thing to do is to create an empty FDS input file. Creation of the input file – FDS simulation Burning object location: middle of the roomĢ.The aim of the FDS simulation we are about to create is to measure the air temperature near the ceiling during a room fire.
If you are an experienced user this guide will constitute a useful recap. This Fire Dynamics Simulator tutorial is about the basic functions of the program.
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