SimCafe

Space shortcuts

Child pages
  • FLUENT - Vertical Axis Wind Turbine (Part 2)
7 more child pages

Versions Compared

Old Version 4

changes.mady.by.user user-7066b

Saved on

compared with

New Version 5

changes.mady.by.user user-7066b

Saved on

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

...

Info

To access Part 1 of the tutorial, click here 

 

The setup for this part 2 of the tutorial has mostly been done during part 1. So it's highly recommended that you go through the first part, as we will start from the same project file.

Learning Goals

In this tutorial, you will learn to:

  • (e.g.: Determine the displacements and stresses in a bike crank using 3D FEA capabilities in ANSYS Mechanical)
  • (e.g.: Verify the finite-element results from ANSYS by refining the mesh and also comparing with hand calculations)
Note

Under Construction

Problem Specification

  • Determine the flow behavior over a Vertical Axis Wind Turbine
  • Apply concepts of Moving Frame of Reference (part 1) and Sliding Mesh (part 2) in FLUENT to simplify a transient problem into a steady state situation

Problem Specification

 

Image Added

 

Consider an uniform flow of V = 10m/s passing through a Vertical Axis Wind Turbine (VAWT) as sketched above. The VAWT has a diameter of 12cm and 3 equally spaced blades, each one with a chord length of 2cm. For simplification, consider that it spins with a constant angular velocity of 40 RPM*. The center of each blade is located 0.04m from the center of the hub.

 

Note that this is a Darrieus VAWT, which is Lift based, in contrast to the Savonius VAWT, which is Drag based. This is an intensive field of research, and at Cornell we have the Fluid Dynamics Research Laboratory, directed by Prof. Charles Williamson. In the last section we will compare results with the experimental data obtain by the lab.

 

 * Note that this is an important simplification. Here we're considering that the turbine is already spinning independently of the flow, what is clearly not true, since the flow is responsible for spinning the turbine. There is only one stable combination of incoming flow velocity and RPM, given the geometry and mass of the turbine. However, modeling the movement of a geometry caused by the flow is considerably difficult, and require use of a method called "6DOF solver". A tutorial on that is intended to be made in the future. For now, let's stick simpler analysis, first a steady state picture of the problem (part 1 of this tutorial), and later a transient analysis (this tutorial).

...



Go to Step 1: Pre-Analysis & Start-Up

...