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  • Wind Turbine Blade - Physics Setup

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Setup (Physics)

Set Material Properties

Outer Surface

Because the thickness of the blade varies, we need to set the material via commands. First, we will create a command that governs the material properties of the outer surface of the blade. To create a command, right click on the Outer Surface surface body, and select Insert > Commands. In the command prompt, insert the following:

Panel

/prep7 !Call the Preprocessor

et,matid,181 !Specify the element type, shell 181
keyopt,matid,3,2 !Use full integration
mpdel,all,matid !Delete all previously assigned material properties
tbdel,all,matid !Delete all previouly assigned tabular data

MP,EX,1,33E9 !Define Young's Modulus: X Direction
MP,EY,1,33E9 !Define Young's Moduls: Y Direction
MP,EZ,1,33E9 !Define Young's Modulus: Z Direction

MP,PRXY,1,0.3 !Define Major Poisson's ratio XY
MP,PRYZ,1,0.3 !Define Major Poisson's ratio YZ
MP,PRXZ,1,0.3 !Define Majoy Poisson's ration XZ

Spar

Create a command for the spar, and insert the following

Panel

/prep7 !Call the Preprocessor

et,matid,181 !Specify the element type, shell 181
keyopt,matid,3,2 !Use full integration
mpdel,all,matid !Delete all previously assigned material properties
tbdel,all,matid !Delete all previouly assigned tabular data

MP,EX,2,101E9 !Define Young's Modulus: X Direction
MP,EY,2,101E9 !Define Young's Moduls: Y Direction
MP,EZ,2,101E9 !Define Young's Modulus: Z Direction

MP,PRXY,2,0.3 !Define Major Poisson's ratio XY
MP,PRYZ,2,0.3 !Define Major Poisson's ratio YZ
MP,PRXZ,2,0.3 !Define Majoy Poisson's ration XZ

Setup Varying Thickness function

Outer Surface

Now, we need to set up the varying thickness function governing the blade's thickness. To do this, we will need to open ANSYS APDL. To open, go to Start > All Programs > ANSYS 13.0 > Mechanical APDL (ANSYS). Once ANSYS APDL opens, go to Parameters > Functions > Define/Edit. The function that will drive the thickness is 0.030 - 0.00048485X where X is the distance from the origin along the X-axis. In the Result text box, type .03 - 0.00048485*, then, to input the x variable, open the drop down menu next that is defaulted to Time and change it to X.

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