[superian]

Hi Foamers,

I'm new to OpenFOAM and CFD in general. I am trying to simulate ventilation in a room. I would like to make a mesh for this using blockMesh but it seems it will take rather long.

I have attached a isometric view of the room drawn in AutoCAD. The blocks within the room will be used to simulate people, computers, desks, cabinets and lights.

I'm sure there is a better way to do this. Can anyone help me out?

Thanks,
Ian
isometric.jpg

If it helps, these are the coordinates of the vertex of each object in the room:

ROOM
    0    0    0
    5.16    0    0
    5.16    3.65    0
    0    3.65    0
    0    0    2.43
    5.16    0    2.43
    5.16    3.65    2.43
    0    3.65    2.43
WINDOW
    5.16    0.15    0.94
    5.18    0.15    0.94
    5.18    3.5    0.94
    5.16    3.5    0.94
    5.16    0.15    2.1
    5.18    0.15    2.1
    5.18    3.5    2.1
    5.16    3.5    2.1
DIFFUSER
    0    1.51    0.03
    0.28    1.51    0.03
    0.28    2.04    0.03
    0    2.04    0.03
    0    1.51    1.14
    0.28    1.51    1.14
    0.28    2.04    1.14
    0    2.04    1.14
EXHAUST
    2.365    1.61    2.43
    2.795    1.61    2.43
    2.795    2.04    2.43
    2.365    2.04    2.43
    2.365    1.61    2.43
    2.795    1.61    2.43
    2.795    2.04    2.43
    2.365    2.04    2.43
OCCUPANT 1
    1.98    0.85    0
    2.38    0.85    0
    2.38    1.2    0
    1.98    1.2    0
    1.98    0.85    1.1
    2.38    0.85    1.1
    2.38    1.2    1.1
    1.98    1.2    1.1
OCCUPANT 2
    3.13    2.45    0
    3.53    2.45    0
    3.53    2.8    0
    3.13    2.8    0
    3.13    2.45    1.1
    3.53    2.45    1.1
    3.53    2.8    1.1
    3.13    2.8    1.1
COMPUTER 1
    1.98    0.1    0.75
    2.38    0.1    0.75
    2.38    0.5    0.75
    1.98    0.5    0.75
    1.98    0.1    1.15
    2.38    0.1    1.15
    2.38    0.5    1.15
    1.98    0.5    1.15
COMPUTER 2
    3.13    3.15    0.75
    3.53    3.15    0.75
    3.53    3.55    0.75
    3.13    3.55    0.75
    3.13    3.15    1.15
    3.53    3.15    1.15
    3.53    3.55    1.15
    3.13    3.55    1.15
TABLE 1
    0.35    0    0.74
    2.58    0    0.74
    2.58    0.75    0.74
    0.35    0.75    0.74
    0.35    0    0.75
    2.58    0    0.75
    2.58    0.75    0.75
    0.35    0.75    0.75
TABLE 2
    2.93    2.9    0.74
    5.16    2.9    0.74
    5.16    3.65    0.74
    2.93    3.65    0.74
    2.93    2.9    0.75
    5.16    2.9    0.75
    5.16    3.65    0.75
    2.93    3.65    0.75
BOX 1
    0    0    0
    0.33    0    0
    0.33    0.58    0
    0    0.58    0
    0    0    1.32
    0.33    0    1.32
    0.33    0.58    1.32
    0    0.58    1.32
BOX 2
    4.21    0    0
    5.16    0    0
    5.16    0.58    0
    4.21    0.58    0
    4.21    0    1.24
    5.16    0    1.24
    5.16    0.58    1.24
    4.21    0.58    1.24
LAMP 1
    1.03    0.16    2.18
    1.23    0.16    2.18
    1.23    1.36    2.18
    1.03    1.36    2.18
    1.03    0.16    2.33
    1.23    0.16    2.33
    1.23    1.36    2.33
    1.03    1.36    2.33
LAMP 2
    2.33    0.16    2.18
    2.53    0.16    2.18
    2.53    1.36    2.18
    2.33    1.36    2.18
    2.33    0.16    2.33
    2.53    0.16    2.33
    2.53    1.36    2.33
    2.33    1.36    2.33
LAMP 3
    3.61    0.16    2.18
    3.81    0.16    2.18
    3.81    1.36    2.18
    3.61    1.36    2.18
    3.61    0.16    2.33
    3.81    0.16    2.33
    3.81    1.36    2.33
    3.61    1.36    2.33
LAMP 4
    1.03    2.29    2.18
    1.23    2.29    2.18
    1.23    3.49    2.18
    1.03    3.49    2.18
    1.03    2.29    2.33
    1.23    2.29    2.33
    1.23    3.49    2.33
    1.03    3.49    2.33
LAMP 5
    2.33    2.29    2.18
    2.53    2.29    2.18
    2.53    3.49    2.18
    2.33    3.49    2.18
    2.33    2.29    2.33
    2.53    2.29    2.33
    2.53    3.49    2.33
    2.33    3.49    2.33
LAMP 6
    3.61    2.29    2.18
    3.81    2.29    2.18
    3.81    3.49    2.18
    3.61    3.49    2.18
    3.61    2.29    2.33
    3.81    2.29    2.33
    3.81    3.49    2.33
    3.61    3.49    2.33

[superian]

Alright, so I finished meshing this room!

I used CATIA to create a geometry.
Exported .STL files from CATIA into Blender 2.68.
In Blender, I labeled patches and setup snappyHexMeshDict with SwiftSnap plugin.
SwiftSnap will write blockMeshDict, snappyHexMeshDict files and triSurface directory with .STL patches.
And you just have to place these files the in the proper directories.

Then run:

blockMesh
snappyHexMesh -overwrite

And it worked!

Hope this helps anyone.

Ian

[vaina74]

Hi superian, I have a similar case. And I am very interested to your meshing procedure, I only used Salome and Netgen.
I need to roughly model a ship engine room to check the efficiency of a mechanical ventilation system. I'm not expert about ventilation because I'm usually concerned about hulls and propellers. I think the solver buoyantboussinesqsimplefoam is the right way. Could you please share your case or provide with a simple case? Thanks for your attention.

[behrouz]

hi to all
i am started linux and openfoam a few weeks ago and i am such a beginner so
i try to simulate a simple ventilation case,like a simple room with 2 or 3 person in it and common load like radition and etc with one indoor supply air.wich one of case in tutorials i should use?and how can i run it?
any refrence,guid or idea and... can help
tnx