How to close the valve while using OVERSET MESH in FLUENT?

- November 14, 2021 at 2:58 pm
  
  JeremyNg
  Subscriber
  
  Hi every one ,I have been doing a simulation about valve closing and opening in IC engines.I successfully doen what HELP taught me to do ,which is using the DYNAMIC MESH & SLIDING INTERFACE & EVENTS to accomplish the valve opening and closing .
  Just like the pictures shows below,I set EVENTS of CREATE and DELETE SLIDING INTERFACE to simulate the valve opening and closing.
- December 9, 2021 at 11:27 pm
  
  RK
  Ansys Employee
  
  Hello,
  First, I would suggest you to improve the mesh and yes, for overset min 4 layers is required. May I know what the end goal of your simulation is?
- December 13, 2021 at 3:13 am
  
  JeremyNg
  Subscriber
  
  Thank you so much for your answer RK, my simulation is about the .Yes you are so pro my mesh quality is quite bad because I am using the hybrid mesh, the picture below is part of the mesh.
  Honestly , I give up the OVERSET MESH now because the calculation can go on though the quality is bad.Now I focus on the SPECIES MODEL, I use serveral MODELs including 1.SPECIES TRANSPORT(Eddy Dissipation & Finite rate ) //2. Non-Premixed Combustion(Chemical Equilibrium) //3. Non-Premixed Combustion (Diesel Unsteady Flamelet) //4. Partially Premixed Combustion.But the PRESSURE - CA results are quite different from the experimental data.(the picture below shows)
  Here is my question , IS THERE ANY SETTINGS OR PARAMETERS CAN CHANGE THE RESULTS?
  I mean ,apart from the DIESCRETE PHASE\ MATERIALS\DYNAMIC MESH which I think I have made the correct settings, is there something I miss in the SPECIES tab? Like another great software , the user can set the paramters in time steps to ensure that the simulation is consistent with the experimental data.