October 25, 2023 at 4:29 pmpuh69Subscriber
I have been running a rotor grid with rotational periodic boundary conditions (non-matching). I have notice that whenever I use the Pressure Far-field boundary condition on the outer surface of the cylindrical grid that my solution begins to diverge, however if I set this to an inviscid will I will find a converged solution. My initial test case is purely axial flow because issues arise with pressure waves escaping the domain when I add the tangential velocity due to this BC issue! Happy to provide more details where requested.
October 26, 2023 at 10:49 amRobForum Moderator
Pictures may help. Far field is really intended for external aero models such as aerofoils etc where there isn't anything around the object of interest. I've never seen them used with periodic boundaries, so don't know if the are designed to work together.
October 26, 2023 at 1:55 pm
October 26, 2023 at 2:48 pmRobForum Moderator
There shouldn't be any/much of a pressure wave hitting the outer face looking at the above. If you plot pressure when it's a wall what are you seeing? Pressure outlet with reverse flow direction from neighbouring cell ought to do it.
October 26, 2023 at 7:08 pm
October 27, 2023 at 8:57 amRobForum Moderator
Possibly, but shouldn't the flow remain as mostly axial?
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