Vacuum / Void Flow

[Anonymous]

I am an Autodesk Multiphyics user and am trying to model flow of an oil through a channel which is evacuated. The oil is passing through a hole in a pipe into a larger cavity which is evacuated. The flow then falls due to gravity into a collector.

In trying to set up this analysis I have realized that using only the oil as a fluid causes the cavity to behave as if it is entire full of fluid which is not the case since it should drop out.

I have also tried modelling a system where the oil enters a cavity full of air to simulation something similar. I find that the oil does not enter the air but just transfers its velocity components to the air, which then moves.

Is there another way I can model such a situation? I am primarily concerned with how the oil impacts the walls of the cavity as it passes through low pressure air (or better yet, a vacuum). This is a flow impingement type problem. Any help would be greatly appreciated.

Thanks,

Cody

[John_Holtz · Accepted solution]

Hi Cody,

My guess is that you are using the wrong analysis type. "Fluid Flow > Open Channel Flow" is what you want to be using.

From there, you can define what part of the model is filled at time zero.