June 28, 2022 at 10:19 pm
RK
Ansys Employee

Hello, 

Here are some suggestions : 

  1. The piston should be at the TDC position in the surface mesh. Make sure this is correct in your setup.
  2. For slider crank mesh motion the direction vector should point from BDC to TDC.
  3. For time step size settings you should always try the default values first. Do not try to use too large values because this can cause the piston to sweep through more than one cell in one time step and consequently causes errors.