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#1 |
New Member
Join Date: Dec 2013
Posts: 1
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Hi guys,
As many of you I'm doing my final degree project on VAWT. Mine is a 3-bladed 2.5 radius turbine, using the NACA 0012 airfoil. I have been facing some mistakes for so long and I can't find a way to solve them, that's the reason why I've decided to ask for help. I know reading a post this long is tiring so I really thank you in advance. I first run a steady simulation in order to use it as an initial solution for the transient case. I use 10 m/s for the inlet velocity. Then I move to the transient case, using the mesh motion with 4 rad/s. I use a time step of 0.0043611 (1º). But I can't get to have positive values for the cm. At first I only got negative ones, then I restarted the geometry and the mesh and eventually got both positive and negative values, but very low ones. I think the problem should be in the setup, so I'm posting it here to see if anyone sees something wrong. -For turbulence I use the sst model (4 eqn) -For the reference values, I set area as the diameter and length as the radius (all the others as default, computed from inlet) -In the transient case i use PISO as the pressure-velocity coupling (simple in steady), and presto for pressure (standard in steady), all the others I leave them as first order. I also attach some pictures of the mesh just in case they were needed. https://dl.dropboxusercontent.com/u/...2014.01.32.png https://dl.dropboxusercontent.com/u/...2014.01.02.png Thank you very much for your help. Pol. |
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Tags |
fluent 14.5, momentum coeficient, turbine, vawt wind turbine |
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