This is my first post, so please forgive any forum gaffs I make.
Gravity doesn't seam to have any effect on my flow simulations. I have run a simple test in exactly the same way, having gravity on first and and off second, but the results are identical. And yes, gravity is acting in the right direction.
As I am working on a gravity powered device, it's crucial that this force be included.
I have been using this for only 4 months, but I have managed to use it successfully to design a carburetor which, when prototyped in reality was very close to the flow simulation results. However, I had to fake gravity by working out the additional pressure myself, and adding it to the atmospheric pressure cap on top. I did this on advice from another flow simulation user, but I still don't understand it and I can't fake it this time.
I've attached a screen shot of the set up. I hope someone can help.
If i've not explained something or its a bit unclear, please do ask.