3D wind turbine modelling/boundary condition defn in rotation
I have some problems defining the boundary conditions in freestream case and wind tunnel case simulations. Since in freestream case, I need to give rotation to freestream and blades as well.
If someone has experience modelling wind turbine, please let me know! thanks, Busra |
I have done wind turbine modeling. Could you be more specific with your question.
Anshul |
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I have some doubts by defining the boundary condition of the blade in rotation for freestream case (whole fluid domain and blades are rotating). Based on the fluent guide, if I let the blades wall in stationary condition then fluent automatically gives a rotation to the walls relative to the adjacent cell zones (fluid). I assumed it should give the same results when I run it by giving 0 rotational velocity (relative to the cell zones) to the walls. But it didnt give the same result! when I check the moment coefficient, it is less than the one that I calculated in BEM. I also check the flow close to tip (90% of the span), there is separation which is surprising at that location. this is because a high inflow angle. I do not know why the inflow angle is so high! if you have any idea, I am glad to hear.. thanks, Busra |
wind turbine
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i have done modeling and meshing in gambit and i am having some problem with fluent analysis. regarding boundary condition and how to calculate the axial induction factor , power and power coefficient directly from fluent |
Hello,
Could you be more specific as to what problem you are facing? Give some details about your simulation case. |
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i hav done the modeling in gambit and meshing for wind turbine rotor. i hav meshed full rotor with outside domain with 1.5D dia. how to give the rotation to the axial wind turbine rotor. should i use MRF or directly i can give rotation to the Rotor blade by specifying it as a wall in gambit. so please tel me how to give rotation to the rotor blade. and how to find out the power output directly from fluent. |
wind turbine
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thanks -- |
Dear Yashwant,
I understand the geometry that you have created. Are you using the MRF? I think this problem requires the use of MRF. Anshul |
sir i am usinf mrf but how weather its conditions are correct or not please tel me or if u have gmail id then i can mail u their my summery of fluent and gambit jounral file so i can get some direction
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Hi Anshmital1912!
I am also validating results for NREL Phase VI turbine blade. I am using FLUENT s/w. I have modelled the Fluid domain as moving reference frame (with radian per second as the rotational speed) and in the walls (blade walls) I selected moving wall with zero velocity. The velocity inlet was applied at the far-field cylinder domain and the top surface of the cylinder. The outflow was specified as outlet of the far-field cylinder. I check the moment in z-axis but it is not comparable with experimental results (experimental results are almost double). Conditions SIMPLE solver cases: 1st order (pressure and momentum) laminar first then 2nd order laminar and then 2nd order transition SST Velocities 7,10,15,20 and 25m/s |
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