[Ebrahim]

Hello Everybody,

I'm trying to simulate the flow around a propeller behind a submarine. The main flow direction is along the propeller axis. Also, the propeller rotates with a rotational velocity of 20 rad/sec. For simulating the propeller rotation, I'm using a sliding mesh technique. The sliding mesh domain is a small cylinder around the propeller.
Assume that the propeller diameter is 1 m. Then, how much should be the diameter of the sliding mesh domain?

I appreciate your helps in advance

Ebrahim

[deepak4021]

Dear Ibrahim
In sliding mesh method, we need to set a rotating domain in which the object rotate. If the diameter of your propeller is 1m then you can vary the rotating diameter from 1.01 to 1.15. varying the rotating diameter has no effect on the aerodynamics force coefficient as well as on streamlines of flow.

[calv]

Hi Ebrahim,

Sorry for bringing up an old post. I am doing similar research as yours. Just wondering if you have verified that the rotating domain size doesnt have a huge impact on the sliding mesh interface?

Currently I am getting relatively larger error/inaccurate values at the sliding interface, I am trying to vary the diameter of the rotating domain and trying to playing around with a more refined mesh at the interface.

Thanks,
Calvin

[LUMBERJACK17]

hi ebrahim and calv i have same research as yours, propeller simulation, mi problem is in the static fluid domain, the propeller streamlines in the rotating volume are very well, but the momentum is not transfered well in the interfase because in the static fluid volume the strealines do not follow the ones created in the rotating volume due to the propeller movement.. is there something that needs to be set in fluent for this