[usamaubk]

Hello,
I am simulating a simple geometry including only piston, liner and head. I am simulating it from IVC-EVO with no combustion (only air). The rpm is around 1250. The swirl setting are default. but when I visualize it in paraview, strangely there is no swirl motion and all the vectors are pointing in the up direction (towards TDC). Like there is no direction change too and no swirl. So any idea how can i force swirl motion into the converge.

[nitesh.attal]

Originally Posted by usamaubk

Hello,
I am simulating a simple geometry including only piston, liner and head. I am simulating it from IVC-EVO with no combustion (only air). The rpm is around 1250. The swirl setting are default. but when I visualize it in paraview, strangely there is no swirl motion and all the vectors are pointing in the up direction (towards TDC). Like there is no direction change too and no swirl. So any idea how can i force swirl motion into the converge.

Hello,


Please make sure you have used non-zero value for swirl ratio in engine.in file.



Let me know if that worked.


Best,
Nitesh

[usamaubk]

Originally Posted by nitesh.attal

Hello,


Please make sure you have used non-zero value for swirl ratio in engine.in file.



Let me know if that worked.


Best,
Nitesh

Hello,
Thanks. yes putting the swirl ratio as non zero worked and I was able to generate swirl. But:
Actually, I am trying to match the experimental heat transfer rate. previously there was no swirl so the HT rate was low. As per your suggestion, I increased the swirl ratio to like 40 and I was able to match exp. data but that's doesn't look realistic. I plotted vectors in paraform and turns out the swirl, in the beginning, like at IVC is too much that seems unrealistic and after IVC it starts to disappear.
Any other suggestions to increase the HT rate. I also tried running the simulation for more cycles and then mapped that data to the IVC but still, HT rate is same infact decreased.. So any suggestion will be helpful..