Forum: FLUENT
June 30, 2010, 16:41
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Replies: 133
Views: 35,183
i dont quite get what you mean. you are...
i dont quite get what you mean. you are simulating a vawt but with a single airfoil in vertical motion?
regarding your mesh, how come you are using more than one interface region (one between the...
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Forum: FLUENT
June 17, 2010, 02:32
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Replies: 133
Views: 35,183
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Forum: FLUENT
June 14, 2010, 07:10
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Replies: 133
Views: 35,183
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Forum: FLUENT
June 13, 2010, 07:04
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Replies: 133
Views: 35,183
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Forum: FLUENT
June 12, 2010, 15:11
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Replies: 133
Views: 35,183
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Forum: FLUENT
June 12, 2010, 15:05
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Replies: 133
Views: 35,183
right. if you really want to simulate turbine...
right. if you really want to simulate turbine start-up, then you need to simulate just about everything including friction and gravity. but most people just want performance optimization and good...
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Forum: FLUENT
June 12, 2010, 12:17
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Replies: 133
Views: 35,183
hi esp,
yes, just take a simple average. but...
hi esp,
yes, just take a simple average. but you must be careful of how you convert moment coefficient to moment. Cm is computed by fluent using reference values. using default reference values is...
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Forum: FLUENT
June 12, 2010, 11:07
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Replies: 133
Views: 35,183
hi esp,
from the looks of it, your moment is...
hi esp,
from the looks of it, your moment is indeed negative. but you should not take the last value of the moment because you are doing an unsteady simulation. take the average of the moment for...
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Forum: FLUENT
June 12, 2010, 08:17
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Replies: 133
Views: 35,183
hi ambergupta,
can you give me the titles of...
hi ambergupta,
can you give me the titles of the articles regarding savonius turbines running at tsr=7? i am a bit confused as to how these vawts can run at high tsr when they are drag machines....
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Forum: FLUENT
May 30, 2010, 03:34
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Replies: 133
Views: 35,183
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Forum: FLUENT
May 18, 2010, 06:44
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Replies: 133
Views: 35,183
sorry i have no idea how to do this. i believe...
sorry i have no idea how to do this. i believe the settings of the inlet all depend on whether you are assuming far-field conditions or wind-tunnel conditions. if you are simulating wind-tunnel...
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Forum: FLUENT
May 18, 2010, 06:34
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Replies: 133
Views: 35,183
Hi nana:
try to monitor the Cm for one...
Hi nana:
try to monitor the Cm for one blade. you can do a phase shift (90 degrees) for the other blades and just sum up all four to get the total torque for the VAWT. no need to monitor the Cm...
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Forum: FLUENT
May 17, 2010, 17:24
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Replies: 133
Views: 35,183
Hi enry:
i'm sorry but i dont have articles...
Hi enry:
i'm sorry but i dont have articles with the outlet conditions as you mentioned. regarding the distance of the outlet from the VAWT, you can just do an analysis on that independent of...
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Forum: FLUENT
May 17, 2010, 08:30
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Replies: 133
Views: 35,183
Hi enry:
i agree with you that up to a...
Hi enry:
i agree with you that up to a certain extent k-e is applicable to VAWT problems. especially if the expected Reynolds numbers are really high. i've seen simulations where k-e RNG gave very...
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Forum: FLUENT
May 17, 2010, 05:44
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Replies: 133
Views: 35,183
Hi nana:
time converged solution means your...
Hi nana:
time converged solution means your monitored parameters are behaving in a steady, consistent pattern. if you are monitoring the moment coefficient, the ripple of the "wave" pattern of the...
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Forum: FLUENT
May 15, 2010, 06:27
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Replies: 133
Views: 35,183
hi esp:
in my version of fluent, its...
hi esp:
in my version of fluent, its Define>Grid Interface. type a name for the interface, select one interface on the left column, select the other interface on the right column. do not tick...
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Forum: FLUENT
May 15, 2010, 04:37
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Replies: 133
Views: 35,183
Hi nana:
you might want to compare what the...
Hi nana:
you might want to compare what the values of k and e are when you specify turbulent intensity and length scale. if they are a lot different from your original k and e specifications, then...
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Forum: FLUENT
May 14, 2010, 05:43
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Replies: 133
Views: 35,183
hi esp-m1000,
to use the sliding mesh...
hi esp-m1000,
to use the sliding mesh technique, first you need two meshes. one is for the fixed mesh, other one is for the rotating mesh (circular mesh). these two must fit perfectly re: diameter...
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Forum: FLUENT
April 27, 2010, 17:58
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Replies: 133
Views: 35,183
high torque?
high values of torque could mean a few things.
for one, a fully turbulent assumption causes delayed dynamic stall and higher torque due to late onset of flow separation (separation drops lift...
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