[Naith]

Hello,

I would like to study the flow of air in a rotating turbine. The goal is to create an air flow from the bottom by rotating the turbine at 15.000 rad/s.
I am using Floworks 2009 for the first time for this project.

So, before working on the real turbine model I made several tests on a very simple form of the turbine in order to choose the best way to simulate it,

since there are different ways to add a rotation on a model.

I made some tutorials to put the turbine in rotation in order to see how the air flows, but from all the tests I had very different views of the flow

trajectory.

So far, I could see that there are 6 different ways of modelisation:
Using a Global Rotation, a Rotating Region or Moving Walls with an Internal or an External analysis.

So, I would like to know which one is the best solution to observe the aspiration of my turbine.



Here are the screens I made for each method, with some explanations about my choices (all the examples following were made with a -20 rad/s rotating speed):

1) Global Rotating - External

There is only the turbine in its computational domain (the lid is disabled: I used it to have a reference for flow trajectories).



2) Global Rotating - Internal

There are the turbine and a lid (with atmospheric pressure boundary condition).



3) Moving Wall - External:

I selected all the walls of the turbine and I made them rotating with Real Wall Boundary Condition.



4) Moving Wall - Internal:

I selected all the walls of the turbine and I made them rotating with Real Wall Boundary Condition again. The lid is set with atmospheric pressure boundary condition.



5) Rotating Region - External:

There are the turbine and its rotating region which cover all the turbine.