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Dynamic meshing 2 stroke engine issue

  1. May 15, 2009 #1
    Hello everyone,
    im a 5th year student and im doing my final project which consists on analyzing the scavenging process of a 2 stroke opposed piston engine, but im having a hard time creating the UDF for the dynamic meshing thing.
    Could anyone please help me?
  2. jcsd
  3. May 15, 2009 #2


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    OK, first, what part of the mesh needs to move? Why do you not just apply a time-dependant boundary condition?

    Also, what is a UDF file? I assume something related to the grid motion.
  4. May 18, 2009 #3
    UDF (user defined function) is required to get dynamic meshes working...
    I need to move 2 piston heads inside the same cilinder in oposite directions
  5. May 18, 2009 #4


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    Right, we use CFX here, so I'm not familiar with these UDFs.
  6. Nov 14, 2011 #5
    Hello, I am also simulating a two stroke opposed piston engine. Has anyone managed to program a UDF for the dynamic mesh please? Thanks.

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