How to vary compression ratio in Chemkin?

- October 11, 2021 at 2:26 pm
  
  Ezzad
  Subscriber
  
  Hi, I am using DI_engine in Chemkin to analyze a diesel engine. I am trying to use higher compression ratios like 18 and 21 but the simulation failed. I assumed that the compression ratio used cannot be larger than 11.19585 as shown in the screenshot below
- October 13, 2021 at 3:18 pm
  
  RK
  Ansys Employee
  
  Hello,
  When you used higher compression ratios, what was the error message that you got? And also, may I know which version you are using?
- October 13, 2021 at 5:08 pm
  
  Ezzad
  Subscriber
  
  Hi I am using Chemkin-Pro 2021. The error message mentioned about the solution cannot converge.
- October 13, 2021 at 7:00 pm
  
  RK
  Ansys Employee
  
  Do you remember the exact error message?
- October 14, 2021 at 1:47 am
  
  Ezzad
  Subscriber
  
  Hi RK To use a compression ratio of 15, I calculated the new stroke length using the compression ratio formula. The engine parameter is shown in the figure below
  And the figure below shows the error message in the output file.