Learning Forum

[fpsundari]

Hallo.
I try to simulate propeller in Fluent. I'm confussed about the boundary counditions. 
When i made the domain (both, rotary domain and stationary domain) with space claim there are inlet, outlet, farfield, wall-propeller, and 3 interface. When the simulation complate, there isn't rotating stream and the lift force always negative even i change the cell zone setup (i use MRF in steady state).
When i made the domain with design modeler there are inlet, outlet, farfield, wall-15, wall-16, wall-17, wall-prop (but it automatically define as hub only), some interface, and wall-prop interface (automatically define as the blade of prop). When the simulation complate, there is the rotating streamline and the error of lift force <10% but when i display the pressure and velocity countur it's like no stream over the propeller.

What can i do to fix this situation? I also need to continue the simulation to get the accoustic SPL with FWH.

[Rob]

Don't use farfield with inlets and outlets. Where is the rest of the domain? 

[fpsundari]

can you explain about the rest of domain please?
I made the domain like this...

And about the farfield, i watched the tutorial and the domain set as inlet, outlet, and wall but i wanna try to simulate the propeller at the open space and it static, so i set the domain as inlet (0 velocity), outlet, and pressure-farfield (0.01 M). Can you recommend the domain settings?

[Rob]

If you use inlet and outlet don't use farfield. If you use farfield don't use inlet & outlet. A zero velocity does just that: the flow is zero and that's generally not what you want.  I think there's a VAWT example in Learning, that'll cover most of what you need. 

[fpsundari]

Ah okay, i get it, thankyou sir