Tutorial

Main steps of a simulation

This tutorial explains how to perform a simulation.

1) What's necessary?

You need 7 files at this stage:

1) xxx.lsr
2) xxx.fra
3) xxx_materiel.mat
4) xxx_revetement.mat
5) xxx_revetement.lai
6) xxx_materiau.mat
7) *.csv

If you work with your own project, you must have complete entirely the steps of the preceding tutorial before to be able to perform a simulation. The first 2 files have been generated by LASER/F when you requested a fragmentation and when you registered your project (see points 5.5 and 5.7 of the tutorial). Files 3 to 6 are the specific material files you created for your project (point 4 of the tutorial). File 7 contains the meteorological information necessary to force the simulation (point 6 of the tutorial).

If you work with the demo project these files are provided in the directory.

2) Open the project

Open the project:

1. In the menu bar of the 'Main' form > 'Projet' > 'Ouvrir' > choose the 'xxx.lsr' file

2. If the 'xxx.vi' file doesn't exists in the project, it is recreated: normally it was created when you import the project (see previous tutorial). This procedure can take a lot of time (up to a day for very big and complex scenes).

3) Define the final resolution of your simulation

If the resolution you chose when you did your first fragmentation doesn't suit you, then you can start the procedure again:

1. In the menu bar, 'Géométrie' > 'Fragmentation' > 'Réinitialiser'.

2. A warning message could appear 'Un étage du bâtiment N°x n'a pas de mur', simply ignore it > 'OK',

3. Activate the 'Géométrie' page > 'Fragmentation' groupbox >, click on the white label entitled 'Superficie. min' and modify the value of the fragmentation (in m²) > 'Fragmentation' button.

4. When step 3 is finished, activate the 'Visualisation' form > check 'Fil de fer' and visualize the results,

5. If you are not satisfied you can repeat the procedure from step 1,

6. Register your project: 'Main' form > menu bar > 'Projet' > 'Enregistrer'.

Groupbox 'Rayonnement solaire': components of solar radiation you want to simulate,

• 'Direct incident': to simulate the direct solar radiation,

• 'Diffus atmosphérique': to simulate the solar diffuse radiation,

• 'Anisotrope': to simulate a anisotropic sky during computation of diffuse solar radiation. If unchecked, simulation is faster and diffuse radiation is calculated with an isotropic sky,

• 'Entre objets': to simulate solar exchanges between the ground elements,

• 'Radiosité': solar exchanges between the ground elements can be simulated by using a radiosity algorithm (very time consuming). If unchecked, simulation is faster and solar exchanges are approximated

• 'Réfléchi lambertien': solar reflected radiation.

Groupbox 'Rayonnement IR': components of infrared (IR) radiation you want to simulate,

• 'IR atmosphérique': to simulate the atmosphérique IR radiation,

• 'Emis': to simulate the IR radiation emitted by the ground,

• 'T. surface': to simulate realistic surface and ground temperatures: if unchecked these temperatures are constant ,

• 'Entre objets': to simulate IR exchanges between the ground elements,

• 'Radiosité': IR exchanges between the ground elements can be simulated by using a radiosity algorithm (very time consuming). If unchecked, simulation is faster and IR exchanges are approximated.

Groupbox 'Radiosité progressive': radiosity management,

• 'Energie non dissipée': energy (in W/m²) below which radiosity is stopped. Recommended value: 1,

• 'Facteur distance': distance at which energy is dissipated. Depends of the geometry of your scene. Must be < 300m,

• 'Nb. max itérations radiatives': number of iterations allowed to stabilize the surface temperature. Recommended value: 3

5) Launch the simulation

In the 'Simulation' page, click on the 'Simulation' button. Follow the progress of the task on the progress bar located at the bottom of the “Main” form. The 'Stop' button allows you to cancel the simulation (the stop is only effective after the end of all parallel processes). At any time you can interrupt a LASER/F simulation in the Windows task manager by killing the process.