Things to be considered while intrepreting Autocad into pyrosim

[Ijaz Fazil Syed Ahmed Kabir]

Hi All,

I'm new to pyrosim and FDS

I have following doubts while importing and drawing based on autocad.

1. If there is any void mark (cross) in ground floor and mentioned 'opening above'. Do I need to keep floor open and construct wall around it or I should just fill it floor?

2. Is thickness of wall important for fire modelling?

3. If autocad (dwg) file have all the floor plans of all levels in same file, How should i align the floors in pyrosim, I mean I need to cut the autcad drawing and import seperately for each floor. In that case how can I sure that both floors are in alignment.

4. If you feel to share me any important things to be considered on autocad drawing interpretation, please let me know.

Note: I'm new to autocad also

Regards

Ijaz

[Randy McDermott]

You may want to post your cad-related questions to the Pyrosim forum:

http://www.thunderheadeng.net/forum/

Regarding wall thickness, it depends on whether heat transfer through the wall is important for your problem.  Generally, though, the wall thickness does not effect the overall heat release for "design" fires where the fuel mass flux is specified.

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[dr_jfloyd]

1. This is a decision you have to make as the modeler as to whether or not you feel that flow out the floor opening will be important for your particular scenario.

2. See Randy's answer

3. CAD drawings typically have column lines or other indications that are common to each floor.  Line up based on those. Your alignment doesn't need to be exact, just close enough that any vertical walls between floors snap to the same FDS grid cell. For example, if you were using a 30 cm mesh in FDS, then as long as your floors were lined up within ~10-15 cm, then OBST inputs for different floors should line up once they snap to the grid.