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May 5, 2015, 13:25 |
savonious wind turbine
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#1 |
New Member
davood
Join Date: Apr 2015
Location: iran
Posts: 10
Rep Power: 11 |
Dear friends
I have simulated savonius wind turbine in fluent but cp (power coefficient ) is more than 59%(multiple reference frame,unsteady,k-e standard model,...), it is 80%.whats wrong? what should i do to get a correct result?but i think i should set up sliding mesh model?!!what do you think?and i dont know how should i set up sliding mesh model, whats different among mrf and smm setting up?would you help me? thanks with respectfully |
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May 5, 2015, 16:56 |
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#2 |
Member
Ethan Doan
Join Date: Oct 2012
Location: Canada
Posts: 90
Rep Power: 14 |
does the compuational domain act in a way that "shrouds" the turbine? This could cause a higher cp
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May 6, 2015, 09:01 |
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#3 |
New Member
davood
Join Date: Apr 2015
Location: iran
Posts: 10
Rep Power: 11 |
I dont know what you mean?would clear it?
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May 6, 2015, 15:18 |
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#4 |
Member
Ethan Doan
Join Date: Oct 2012
Location: Canada
Posts: 90
Rep Power: 14 |
I just mean that 59 % limit exists because the air is expanding as it moves toward and through the turbine if you allow the air no room to expand and you are forcing it all through the turbine because the borders of your domain are too close to the edge of the turbine you may see a higher efficiency. Btw i think for VAWT the theoretical max efficiency should be even lower then 59 %
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May 8, 2015, 02:50 |
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#5 |
New Member
davood
Join Date: Apr 2015
Location: iran
Posts: 10
Rep Power: 11 |
thanks a lot dear
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May 9, 2015, 02:05 |
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#6 |
New Member
davood
Join Date: Apr 2015
Location: iran
Posts: 10
Rep Power: 11 |
I did that but results didnt change
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May 11, 2015, 09:23 |
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#7 |
Member
Ethan Doan
Join Date: Oct 2012
Location: Canada
Posts: 90
Rep Power: 14 |
According to fluent using MRF is "meaningful only for steady flow" perhaps this is something you should look closer into, Im sorry I cant give better advice.
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May 11, 2015, 11:42 |
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#8 |
New Member
davood
Join Date: Apr 2015
Location: iran
Posts: 10
Rep Power: 11 |
thanks dear
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May 13, 2015, 11:42 |
savonius wind turbine
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#9 |
New Member
davood
Join Date: Apr 2015
Location: iran
Posts: 10
Rep Power: 11 |
hi dears
i have simulated savonius wind turbine but i dont know how should i calculate cp?cm which i have got ,are more than 1,is it possible(cm>1)?when i have defined pressure outlet boundary, should i set up reference pressure location? thanks |
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