Expanding Mesh Fluent

- March 8, 2018 at 12:53 am
  
  agion
  Subscriber
  
  Hi all, I am brand new to the world of ANSYS and any multiphysics modeling in general. I am trying to set up a simply dynamic mesh problem to simulate crystal growth (I am a geologist by training). Essentially I have set up a problem with a small cube (a crystal) inside of a large cube (growth medium) and the small cube grows at the expense of the large cube. I am having problems getting the smaller cube to grow in size. I've been able to set up the geometry, create a mesh, interfaces etc. but am struggling with the setting up the dynamic mesh. I think I need to use a deforming mesh but I'm not sure. Are there any tutorials that explain a related problem, or does any know of a simple way to set this up?
- March 8, 2018 at 2:44 pm
  
  Raef.Kobeissi
  Subscriber
  
  Hi,
  
  Something that could help you understand the basics:
  
  https://www.youtube.com/watch?v=7-KJha89AyI
- March 8, 2018 at 4:02 pm
  
  agion
  Subscriber
  
  Raef,
  
  Thank you for the help. I watched the video and I had a second question about the velocity profile. Is it possible to write a profile that results in motion in 6 directions (x,-x,y,-y,z,-z)? I want to have the mesh grow an equal amount all directions.
- March 11, 2018 at 10:51 pm
  
  Raef.Kobeissi
  Subscriber
  
  Hello yes it is possible writing the right UDF.
- March 11, 2018 at 10:52 pm
  
  Raef.Kobeissi
  Subscriber
  
  It is difficult to help writing it without knowing the parameters
- March 14, 2018 at 4:55 pm
  
  agion
  Subscriber
  
  Raef,
  
  Ideally the I would like the UDF to increase the size of the cube in each direction equally. For instance if there the cube is 1x1x1 cm at t=0 advancing through, say 5 steps, would result in a cube that is 6x6x6, resulting in a motion 1 cm/s. This is just an example of the type of thing I am looking for. I was able to write individual udfs for each direction, but I am not able to increase the surface area of the cube. I wind up with 6 faces separated by a distance. At some point the model crashes and gives me the error that negative geometry has been detected. I hope this clarifies things a bit. I am still getting the basics down so my understanding is still limited.
- March 15, 2018 at 9:44 pm
  
  Raef.Kobeissi
  Subscriber
  
  Did you try to use unstructured mesh? Triangular/tetrahedral?
  
  cheers

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