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Hex-dominant automated: Mesh around a spoiler

Note

The content of this tutorial is not up to date with the current live version of SimScale. The tutorial setup and the results are still valid! Please do not get confused if styles like buttons and entity names have changed in the meantime.

This short tutorial shows how to create a mesh using the automatic Hex-dominant for wind-tunnel/external flow for the analysis of flow around a spoiler.

Step-by-step

Link to tutorial project containing the geometry:

Import tutorial project into workbench

Getting started

  • Geometry can be uploaded by drag and drop or can also be directly imported from Onshape.
  • For this tutorial, you have to import the tutorial project into your ‘Dashboard’ via the link above.
  • Once imported, the ‘Work bench’ is open and you will be in the ‘Mesh creator’ tab.
  • Click on the CAD model to load the model in the viewer.
Upload a CAD model of the geometry that shall be analyzed in terms of the flow around it

2) Mesh generation

Click the available geometry. Then click on “Mesh Geometry” button in the options panel.

Create a new mesh and add a mesh operation - in this case the Hex-dominant automatic "wind-tunnel/external flow" (only CFD)

The Hex-dominant automatic “wind-tunnel/external flow” (only CFD)

Select the mesh parameters according to the problem. Fineness increases the mesh quality at the cost of increased mesh size and computational time. Use layers addition to add layers at the geeometry boundary for better mesh resolution near the boundary.

Settings for this tutorial - the layer addition option automatically inflates five fine layers at physical walls

Settings for this tutorial - the layer addition option automatically inflates five fine layers at physical walls

Adjusting the baseMeshBox - this determines the size of the flow domain around the object. For demonstration purposes, we choose a very small one.

Adjusting the baseMeshBox - this determines the size of the flow domain around the object. For demonstration purposes, we choose a very small one.

Important

For external flow cases the flow domain (baseMeshBox) should be 2-3xL upstream, 4-6xL downstream and 2-3xL in the cross-wind directions from the object. Here ‘L’ is the body length in the flow direction.

3) Mesh review

Hitting the start button and confirming the box gives us the results in less than ten minutes (on two cores)

Hitting the start button and confirming the box gives us the results in less than ten minutes (on two cores)

The event log shows exact quantities of the resulting mesh. In this case generated around 1.536.000 cells.

The event log shows exact quantities of the resulting mesh. In this case generated around 1.536.000 cells.

The mesh clip filter allows a more detailed visual review of the mesh and its internal properties

The mesh clip filter allows a more detailed visual review of the mesh and its internal properties

A closer look onto the boundary layer shows the fine cell layers that have been inflated on the surface of the spoiler

A closer look onto the boundary layer shows the fine cell layers that have been inflated on the surface of the spoiler