November 26, 2020 at 9:37 amWeiqiang LiuSubscriberHi all,nrecently I've been using fluent to simuation some combustion application with detailed chemical mechanisms. I found inelt condition would influence convergence performance of my case.nFor example, when inlet velocity of fuel air mixture is 0.3, then convergence would be bad and there are unsmooths and flunctuations in profiles report. However, when I increase inlet velocity to 0.5, then resutls are very smooth. The other settigns are just exactly the same. I am wondering why would this happen? why would just inlet velocity influence convergence performance?nBest regardsnweiqiang n
November 26, 2020 at 10:27 amDrAmineAnsys EmployeeWhy not: you are basically running a completely different case as you changed the velocity magnitude.n
November 26, 2020 at 11:18 amWeiqiang LiuSubscriberyes, it's a numeric process. I get it nThanks a lot nweiqiangn
November 26, 2020 at 11:27 amRobForum ModeratorAnd in a physical sense, lower velocity could promote an unstable jet, large dead zones etc. With combustion you've also then got all the chemistry and burner design:there's a reason most burners have a recommended operating band (pressure/flow & AFR). n
November 29, 2020 at 8:43 amWeiqiang LiuSubscriber
Why not: you are basically running a completely different case as you changed the velocity magnitude.https://forum.ansys.com/discussion/comment/98468#Comment_98468Hi Dr. Amine,nThanks for reminding. Do you mean in physical world, changing inlet velocity a little bit seems doesn't really change the essence of this problem. However in numerical world, case would iterates very differently with different inlet velocity.nBest regardsnweiqiangn
November 29, 2020 at 8:45 amWeiqiang LiuSubscriber
And in a physical sense, lower velocity could promote an unstable jet, large "dead" zones etc. With combustion you've also then got all the chemistry and burner design: there's a reason most burners have a recommended operating band (pressure/flow & AFR).https://forum.ansys.com/discussion/comment/98476#Comment_98476Hi Rob,nThanks for sharing me with this konwledge. It's helpful!nBest regardsnweiqiangn
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