[markreal_97]

Hi everyone,

I have a problem with Converge Studio 3.0. I designed the geometry of a simple cylinder using Solidworks at TDC and then imported it in STL format into Converge. After assigning the boundaries (piston, liner, and head), I set the geometric characteristics (stroke, bore, and connecting rod) and then moved on to the compression ratio calculation.

First, when I press the "Refresh Current Compression Ratio and Piston Displacement" toggle, the warning message you see in the attached file appears. Then, when I press the "Move Piston Toward Target Compression Ratio" toggle, the piston overlaps the head in a strange way instead of showing me the cylinder at BDC (second image attached).

Could the geometry be the problem?

[awaikar]

Hi Marco, thank you for your question.
Looks like the issue is related to the boundary assignment. You have included the triangles on the top as piston and it will be considered as a moving boundary as well. Putting it in a different boundary should fix it.

[markreal_97]

Hi Ameya,
Thank for your reply, but I don't think this is the problem. As you can see I have included only the triangles of the piston as moving boundary.

[xieshengbai]

Hi Marco, in the compression ratio calculation tool, it is based on the assumption that the piston is at the BDC. Therefore, you need to create the piston at BDC instead of TDC.

Originally Posted by markreal_97

Hi Ameya,
Thank for your reply, but I don't think this is the problem. As you can see I have included only the triangles of the piston as moving boundary.