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The Connector, the newsletter for CFD Mesh Generation from Pointwise

March / April 2011

New Video: Multi-Block Grids for Axial Turbines

A two-part video recently added to the Pointwise website walks you through generation of a multiple block structured grid on the Aachen Turbine, a high stagger angle axial flow turbine. Testing was performed at the Institute of Jet Propulsion and Turbomachinery (IST) of RWTH Aachen, Germany, through research projects funded by AG Turbo and FVV (German Research Association for Combustion Engines).

Multiple block structured grid on Aachen Turbine

Figure 1: Multiple block structured grid on Aachen Turbine

The two videos together are less than 30 minutes long, but in that short amount of time you will learn

  • Why the particular grid topology was chosen
  • How to create periodic grids
  • How to extrude a high quality boundary layer grid
  • How to split blocks, domains and connectors to help build the grid topology
  • How to use the elliptic solver to improve grid quality

It is an informative and action packed 30 minutes!

Part 1 of the video outlines the problem and discusses the logic behind the grid topology used for this case, which is shown below.

Block topology used for Aachen Turbine grid

Figure 2: Block topology used for Aachen Turbine grid

Next, you will see how to create periodic surface grids and enforce the desired viscous spacing at the turbine's hub and shroud. Finally, you can watch as a high quality, boundary layer resolved O-grid is quickly extruded from the turbine blade surface. Part 2 of the video picks up with splitting the existing blocks and domains to help create the remainder of the multiple block structured topology. Once these are split, you will see the creation of the final parts of the grid topology, its assembly into domains and blocks, and quality improvement using the elliptic solver.

Grid topology after smoothing with floating boundaries.

Figure 3: Grid topology after running elliptic solver with floating boundaries

If you are new to making structured grids or just want to pick up some tips and tricks for making the process faster, these two videos will be useful for you. Be sure to check out our other videos to learn even more.


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