Hypermesh CFD


This page is to give a basic understanding of meshing an object to be analyzed using a CFD solver such
as Fluent.

The first step is to model the air solid in a CAD program and then to export it as an iges file.

Import this iges into HyperMesh using the import menu. This menu can be accessed by clicking the green
arrow that is pointing down and to the right in the upper left hand corner of HyperMesh.

Browse to the air solid iges file and then click apply.

The first step in creating the mesh for CFD is deciding which surfaces need a boundary layer and which do not.
in the model window (left side of screen) right click and select create component. Do this twice. Create a
component that will receive a boundary layer such as "object" "air_foil" or "b_layer". Name the second component
as something that will not receive a boundary layer such as "walls" or "non_b_layer".

Select the tool menu (radio buttons below graphics window). Select "organize".
Use the organize menu to move the surfaces to the two components that you created.

Once the surfaces are divided up into these two groups. Access the 2D auto mesh panel by pressing F12 or by using
the drop-down menu at the top: Mesh >> Create >> 2D Automesh.

[[ Image:HypermeshCFD 2d automesh panel.JPG]]

In this menu, select all surfaces, give a mesh size and then mesh the surfaces. You can further refine the mesh
in the important areas of interest by clicking on the white numbers along the edges. once you are satisfied with
the mesh select "return".

Now that you have the surface meshed you are ready to create the 3D CFD mesh. Access the 3D CFD mesh panel by selecting
the 3D radio button below the graphics window. 3D >> Tetramesh >> CFD mesh. In this menu define the thickness of the
boundary layer and the growth rate for additional layers.

On the left side of the panel under the "fixed with boundary layer" button click the yellow comps button. Select the
component that you created that contains the surfaces where a boundary layer is required. below the "flow w/o boundary layer"
button click the yellow comps button and select the component that does not require a boundary layer. Make sure that the
option below the non-boundary layer comps is set to remesh.

click mesh and wait. . . . . . . . . . . .

By: Garrett Bodily