Tutorial 2: Idealized Wing-Body

Tutorial 2. Part 2. Mesh a 3D model of a simple airplane fuselage and wing

Tutorial 2. Part 2. Mesh a 3D model of a simple airplane fuselage and wing

What you will learn

Step 1. Creating the Wind Tunnel

In many external flow calculations a rectangular box is created around the geometry to simulate wind tunnel conditions. In GridPro, the user only needs to import the geometry because the walls of the tunnel, as was learned in Tutorial 1, can be created internally. Open up the model by using the left mouse button and double clicking on the Tutorial_2_p2.fra file. Turn off the Cut-Plane and go to the topo pull down menu and click on the read MACRO button. Make a box with topology + surface as in the dialogue box below. Do not resize the dimensions.

Step 2. Creating the Inner Topology

Snap the grid to the YZ plane by going to the snap function in the ROTATE sub-command panel and selecting world: xyz . The geometry should be aligned along the plane as in the picture below. Again, if you snap to another plane rotate the geometry close to the YZ plane and snap again.

Step 3. Introduction to Advanced Surface Displaying

While using GridPro, many cases will arise when you need to use the advanced display functions to create and edit topology. Our topology is almost ready to be wrapped except some of the topology edges are intersecting the fuselage. Zoom-in on the fuselage/ wing intersection and let’s have a look.

Step 4. Creating the Wrap and Assigning the Surfaces

The Fuselage
As in the 2D case, the wrap is created in two steps. The first wrap will be created around the fuselage and the second wrap around the wing. Start by switching all of the surfaces to points and by removing the topology around the wing from Group 2 so that only the topology around the fuselage remains.

The Wing
To create the wrap around the wing, snap the grid to the YX plane to see the front view and add the inner topology around the wing to Group 3.

Step 5. Introduction to Grid Density

The topology is complete and the surfaces have been assigned. Go to the topo sub-menu on the top to start the gridding process. Wait a few minutes and load and view the grid. Make a couple of Grid Sheets along the fuselage and the wing by left clicking on the edge button in the MAKE SHEET sub-command panel and the block edges.

Step 6. Introduction to Boundary Layer Clustering

Clustering is extremely useful for capturing the details of a boundary layer. As an example, let’s cluster the boundary layer on the wing. While the calculation continues to run, stay in the Topology Builder and choose the wing as the current surface by making sure it is highlighted in light blue. Go to the surf pull-down menu and choose reload current.