OK, the channel is around 200 microns across. CAD kernels (the backend geometry tool that the interface sits on) tend to be accurate to a fraction of a mm but aren't designed to work with micron scale domains. However, most are good with mm or higher. So, if you make your channel 2 or 20mm across you should avoid issues with the kernal tolerance functions. Then mesh WITHOUT scaling.Â
In Fluent we can scale the mesh very accurately back to the correct dimensions.Â
As an aside, if you're trained on one of the CAD tools just use that and export Step or another supported format for use in the Ansys geometry tools. The supported list is in the same place you downloaded Student.Â
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