Dynamic meshing 2 stroke engine issue

[tonisantos]

Main Question or Discussion Point

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?

 

[minger]

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.

 

[tonisantos]

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

 

[minger]

Right, we use CFX here, so I'm not familiar with these UDFs.

 

[darrencam]

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