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July 9, 2015, 05:25 |
Rotating wind turbine - SAS SST
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#1 |
New Member
Florian
Join Date: Oct 2012
Posts: 2
Rep Power: 0 |
Hi guys,
I'm simulating a Darreius rotor combined with a Savonius rotor. I made a unstructured mesh with a structured area at both sides of the rotating interface, so that the mesh at the interface matches perfectly each time step. I ran the simulation for about 1000 time steps and noticed a serious problem at the transition from the structured area to the unstructured area in the rotating body. (See Picture) My boundary conditions are: Transient Simulation: -Time steps: 2.5e-05s Rotating: -4000 rpm Stationary: -Velocity: x = 15 m/s Advection Scheme: -Central Difference (Bounded CDS) Transient Scheme: -Second Order Backward Euler -Automatic Timestep Initialization Turbulence Numerics: -High Resolution I really don't know whats wrong and I would be very happy if someone could help me. Kind regards, Flo27 Last edited by Flo27; July 9, 2015 at 06:49. |
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July 9, 2015, 06:51 |
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#2 | |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,706
Rep Power: 143 |
Quote:
What is the serious error? The ring of high velocity at the interface? If so, try this: * do you see it when you plot velocity (not velocity in stn frame) * Check you are not plotting hybrid values * do you see it when you use other differencing schemes such as Hi-res or hybrid? * did you have an initial condition where the rotating bit was initialised with a rotating velocity (ie zero velocity)? * Are you sure you have correctly put an interface between the rotating the stationary bits? what type of interface did you use anyway? I am suspicious you have not done this properly as matching nodes over interfaces is not usual procedure. |
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