I am totally new to blender and 3d rendering.
What I want to create is something similar the water filling an object except in reverse. Meaning, I want it to simulate natural gas fumes that rise and fill up pockets above and then spill out of that and continue to rise. This would be a constant flow. I looked at the smoke effect, but I didn't see where you can adjust the opacity or color of the smoke to make it adjust to look more fume like. I thought if you could reverse the gravity of liquid and make it flow upwards, I could possibly adjust the material to look more like fumes.
Here is the scenario - There are CNG (compressed natural gas) gas pumps. If there are leaks, these fumes (unlike regular petroleum fumes which sink) rise and can collect in certain pockets within the dispenser and just like a glass filling up, if you continue to pour (or gas continues to leak) it spills over. This is the effect I would like to try and create.
Is there some sort of tutorial that I can look at that will help guide me in the right direction?