Change Thickness in Mechanical for FSI

- January 15, 2020 at 9:51 pm
  
  hnorthrup
  Subscriber
  
  I am following the "Two way FSI using ANSYS Fluent Part-1" video which can be found on youtube here: https://www.youtube.com/watch?v=DGPmyGFnzhA
  
  I am using my own geometry file (.stl). When I open it in Design Modeler it does not import as a Surface Body and I am not able to add thickness to it in Mechanical. I have been able to add thickness by importing the geometry in SpaceClaim instead. However, when I used SpaceClaim I am not able to add a Fixed Support to the edges/ends of the geometry. However if I import the geometry in Design Modeler, I am able to add a Fixed Support to the edges of the geometry. Basically I need to be able to add thickness, and fixed support to my geometry in Mechanical but depending on the program I import my geometry into, I am only able to do one or the other.
  
  Thanks!
- January 16, 2020 at 3:16 pm
  
  Rob
  Forum Moderator
  
  Try setting named selections to the new face that's formed when you add a thickness in SpaceClaim. I'm not sure why you've posted this into the CFD section, so I'll move to Pre-proc.
- January 24, 2020 at 11:59 pm
  
  hnorthrup
  Subscriber
  
  Sorry for not being very clear. I am trying to add thickness in Mechanical not SpaceClaim. This does not do the same thing, does it? (Obviously I am new at this.) Also thanks for changing my post location.
- January 25, 2020 at 4:32 pm
  
  peteroznewman
  Subscriber
  
  STL is the worst kind of data to begin analysis with.
  
  What is the original source of the geometry? If it is in some kind of CAD system that has other choices for exporting the data, use Parasolid, or STEP, or IGES.
  
  However, if the source of the geometry was a 3D scanner, STL may be the only available output. In that case, there are many tools in SpaceClaim to clean up the STL data and turn it into useful geometry for analysis.
  
  Let us know what options you have and if it is only STL, you can put that in a .zip archive file and attach that to your reply so I can look at it. Also say what version of ANSYS you are using.
- January 29, 2020 at 9:48 pm
  
  hnorthrup
  Subscriber
  
  Hi,
  
  Thank you for your help. The source of the geometry is from Amira. We reconstruct vessels from MRI images. We export our files as a STL ascii so that we can add flow extensions and calculate centerlines in VMTK.
  
  I have attached a .zip with a geometry. It is split down the middle and I would like to make the two sides of the geometry to have different thicknesses in Mechanical. I would also like to add fixed supports to the edges. Also in the .zip are two word documents showing in greater detail the two main techniques that I have used which showed the most promising results.
  
  I am using Workbench 2019 R3.
  
  Thanks!