As a first step, we need to create a new simulation. To create a simulation, left-click on the ‘Pipe-shape’ and then on the ‘Create Simulation’.
This dialog box allows the user to select the simulation model. Click on the ‘Incompressible‘ option and then on the ‘Create Simulation’ one.
The default settings for the simulation are kept the same. Save the simulation model by clicking on the tick mark.
Left-click on the ‘Mesh’ icon to create a new mesh.
Choose the ‘Hex-Dominant (only CFD)’ Algorithm and the meshing mode to be ‘Internal‘.
Select the sizing option to ‘Automatic mesh sizing‘ and change the desired mesh sizing to ‘Fine‘.
Specify the ‘Number of processors’ for the meshing operation (16 in this tutorial).
Boundary Layer Refinement
In order to correctly model the flow through a pipe, the boundary layer has to be resolved accurately. This can be achieved by refining the mesh in the regions close to the walls.
The best method to do this is with the help of a layer inflation mesh refinement. To add a mesh refinement, click on the ‘+’ icon next to ‘Refinements‘ under the ‘Mesh‘.
Select the ‘Inflate boundary layer’ setting.
Keep the default settings in the dialog box.
The next step is to pick the faces.
All faces except the inlet and outlet faces need to be selected.
Select all of the faces of the pipe by dragging the Active box selection over the pipe and deselect the inlet and outlet faces by clicking on them.
It would be seen 5 faces are selected for boundary layer refinement.
Mesh Generation & Results
The automatic mesh generation is performed as part of the simulation run. After all the properties and boundary conditions of the simulation are added, a new run gets started.
Right before the simulation begins, the mesh is being created, as it is indicated at the bottom left of the interface with the blue icon. The progress can be monitored from the blue bar of the mesh panel.
Mesh Inspection & Mesh Clip Generation
The mesh is generated when the bottom left icon next to the mesh name turns to a green circle with a check mark. The event log can be checked for further information on the mesh.
The boundary layer generation can easily be seen by zooming in on the mesh inlet.
Click on the ‘Mesh clip‘ to inspect the internal mesh. Adjust the settings of the normal. Click on the ‘Generate Mesh Clip‘ icon.
The mesh clip generated is presented below:
If you are wondering how to post process your results have a look at this guideline.
Last updated: March 27th, 2020
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