Dynamic meshing 2 stroke engine issue

AI Thread Summary
The discussion focuses on the challenges of creating a User Defined Function (UDF) for dynamic meshing in a two-stroke opposed piston engine simulation. The original poster seeks assistance in analyzing the scavenging process and specifically needs to move two piston heads in opposite directions within the same cylinder. Participants inquire about the specific mesh movement required and suggest considering time-dependent boundary conditions. There is a shared interest among users in programming UDFs for dynamic meshes, indicating a collaborative effort to solve the issue. The thread highlights the complexities of simulating engine dynamics effectively.
tonisantos
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Hello everyone,
im a 5th year student and I am doing my final project which consists on analyzing the scavenging process of a 2 stroke opposed piston engine, but I am having a hard time creating the UDF for the dynamic meshing thing.
Could anyone please help me?
 
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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.
 
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
 
Right, we use CFX here, so I'm not familiar with these UDFs.
 
Hello, I am also simulating a two stroke opposed piston engine. Has anyone managed to program a UDF for the dynamic mesh please? Thanks.

Darren
 

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