The Wind tunnel Pro app can take as input a png file. This way you can draw your obstacles on your computer with your favorite software.
The png should have a white background, all non-white areas will be interpreted as obstacles. They must not have transparent background. For better results, you should have a 768*1024 file for iPad and 320 × 480 for iPhone or iPod ( otherwise it will still works, but will be distorted).
Here is the detailed procedure to import such files :
1) Plug your iPhone/iPad to your computer.
2) Open Itunes, select your device in the left panel :
3) Select the “Apps” tab at the top of the window. Then scroll down to the bottom, you should see this file sharing system, with the list of apps supporting it. Select “WTunnel-Pro” in the app list.
4) Click “Add”, then choose your “.png” file. It should automatically transfer it to your device and appear in the documents list.
5) On your iPod/iPad, open the Wind Tunnel pro app, tap “Load”, the png file should appear in the “Your saved models” section.
NB: In some cases there is a problem with iTunes preventing png files to be transfered. If this happens to you, try to delete the app and install it again. Users reported it corrected the problem.
There are currently no actual units in the simulation. It was at first designed to be a visual app, not an engineering tool. However, we agree it could be interesting to give some units and values (speed, viscosity, pressure, Reynolds number). We are working on it and might include some units in a future update.
It is not possible to have a finer brush size. It would require a higher resolution for obstacles, hence much more computation, but we are already pushing the hardware to its limit. in Wind Tunnel Pro, you can import a “.png’ file you drew on your computer. This will not allow you to have higher-res obstacles (the .png will be adapted to fit the app resolution), but is still easier than drawing everything with a finger on a small iPhone screen.
There are currently no Android version. However, given the high number of requests we had, we decided to make one in the future.