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  • Wind Turbine Blade FSI (Part 1) - Numerical Solution

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Wind Turbine Blade FSI (Part 1) - Panel
Wind Turbine Blade FSI (Part 1) - Panel

Numerical Solution

Here, we tell FLUENT which solution method to use, how many iterations to perform, how to initialize to solution and what to visualize during the calculation. Finally, we run the calculation. 

HTML
<iframe width="640" height="360" src="//www.youtube.com/embed/1mgms59QTI8" frameborder="0" allowfullscreen></iframe>

Summary of steps in the above video:

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  1. Change Scheme to Coupled 
  2. Pressure to Standard
  3. Check Pseudo Transient and High Order term relaxation 

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  1. Change the residuals of each field to 1e-6
  2. Create a surface monitor
    1. Select plot
    2. Select write
    3. Select Blade surface

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  1. Standard
    1. From inlet
Info

This module is from our free online simulations course at edX.org (sign up here). The edX interface provides a better user experience and the content has been updated since it was first recorded, so we recommend that you go through the module there rather than here. Also, you will be able to see answers to the questions embedded in the module there.

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Note
titleNote

In the above video we set the residuals to be very small, at 1e-6. This effectively ensured that the calculation did not stop before before the 1500 iterations specified. A solution is deemed to have converged (and the calculation ends) when ALL residuals fall below the limit set. Although I forgot to input 1e-6 for k and omega, the outcome is the same because the x-velocity, y-velocity and z-velocity residuals had not reached 1e-6. 

Note

For the first few hundred iterations you may see "reversed flow" being listed with each iteration. This will eventually disappear as the solution stabilizes and is nothing to be concerned over. This can easily be fixed in later iterations by moving the outlet further away from the wind turbine blade geometry.

 

 

Solving may take a while depending on your computer and how it is set up, to give you an idea of the time it might take some run times are listed below. 

Computer SpecsConfigurationRun Time

Intel i7-4770S

quad core 3.10 GHz

16 GB RAM

(Phillips Lab at Cornell University)

Double Precision

2 Parallel Processes

67 minutes

intel i7 - 2600

quad core 3.40 GHz

16 GB RAM

(Upson Lab at Cornell University)

Double Precision

2 Parallel Processes

75 minutes

 


Go to Step 6: Numerical Results

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