Cylinder geometry warping during Piston motion
I want to perform a cold-flow analysis in a simple 2-valve IC engine with the 'In-cylinder' option turned off in dynamic mesh. I have defined the piston motion using UDF and applied it to the bottom surface plane of the cylinder. The thing is my geometry is a little different. It is a curved cylinder with angular sinusoidal piston velocity as shown in figure.
2 parts in geometry. Port1 is the upper cylinder head, Port2 is the lower cylinder. I named selection piston, inlet, outlet and cylinder wall. Wall-port1, Wall-port2 and Cylinder are 'deforming' while Piston remains rigid body (UDF). Minimum and Maximum length scales in Remeshing are equal to the initial element mesh size.
Here's the results:
The piston attached to the cylinder edge but the cylinder is compressed because of piston motion and the sides of cylinder are seen warped because of it (as shown in fig) instead of being rigid. I need the cylinder wall to be re-generated (bigger or smaller) at each timestep due to the piston motion instead of being compressed and expanded, just like in a normal straight cylinder engine, the air is compressed but the cylinder wall doesn't, only the cylinder wall interface increases and decreases.
Please help what dynamic mesh settings should i select so that the cylinder end edge moves with the piston with continuous remeshing for the cylinder at each timestep.