[hemmt]

how to simulate air flow around urban environment at pedestrian level, my point is how to use google earth data for meshing around urban environment

[harry94]

Originally Posted by hemmt

how to simulate air flow around urban environment at pedestrian level, my point is how to use google earth data for meshing around urban environment

Just doing a study in this right now and will give you a bit of info at how I've went about doing this.

• Cad Mapper To Gain 2D (or maybe 3D depending on how lucky you are and if the location you are studying contains building height data) to extract the area of interest and import it to a CAD file
• If you do not have any building height data, study google earth and use the streetview function to determine heights if you don't already have that info
• For meshing, you have to determine the areas you are most interested in (i.e. where pedestrians are). In your geometry, I'd be looking at specifying different levels of fluid domains so a finer element size can be given to areas near building geometries
• Scale Model (you might want to redo this stage later depending on your purpose/capabilities
• Determine your physical set-up and simulate
• Go back and look at y plus values and other measures of quality and refine and resimulate if necessary

Hope that helps

EDIT: I'd also advise that you do a literature review and try to properly understand what you are trying to do. Jumping into software is tempting but you've got to have a very good idea of what you are doing or else you could waste a bit of time and produce data that you don't really understand yourself.