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#1 |
New Member
Chao.xiang
Join Date: Mar 2017
Posts: 9
Rep Power: 9 ![]() |
Hello,
I meet a question,when I calculate cylinder flow.TKE increase to 3500 before IVO suddenly.At the same time,Tumble Rate of Y change constantly. Thank you. ![]() ![]() |
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#2 |
Senior Member
Tobias
Join Date: May 2016
Location: Germany
Posts: 302
Rep Power: 11 ![]() |
What kind of engine do you have there?
Did you have a look at regions_flow.out for flowrates and/or in 3D postprocessing to see what is happening? |
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#3 |
Member
Tristan Burton
Join Date: Sep 2017
Posts: 92
Rep Power: 9 ![]() |
Hello,
Yes, you'll want to do some 3-D post-processing to determine what flow features are responsible for the large production of TKE. Best regards, Tristan |
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#4 |
New Member
Chao.xiang
Join Date: Mar 2017
Posts: 9
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Fristly,Thank you very much.
But I don't konw what happened in my model.If is it related to the error inital boundary?Everything is ok,unless the increasing TKE at the start of the IVO. |
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#5 |
New Member
Chao.xiang
Join Date: Mar 2017
Posts: 9
Rep Power: 9 ![]() |
Oh,my friends
Thank you for replying my question. I just simulated the cylinder flow of an TDC gasoline engine. By watching at the 3D postprocessing,At the beginning of the IVO,The Velocity is bigger than others. But I don't know that if it is relaxed to the inital boundary. |
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#6 |
Member
Tristan Burton
Join Date: Sep 2017
Posts: 92
Rep Power: 9 ![]() |
Hello,
What are the pressures in the intake region and the cylinder region just before IVO? Best regards, Tristan |
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#7 | |
New Member
Chao.xiang
Join Date: Mar 2017
Posts: 9
Rep Power: 9 ![]() |
Quote:
The cylinder temperature is 1081,and pressure is 345245. The intake_port temperature is 316,and pressure is 182390. The exhaust_port temperature is 1052,and pressure is 323819. At the same time,the outflow pressure is 2.728e6,I has found that it is wrong... the right pressure should be 2.728e5... Thank you very much. |
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#8 | |
New Member
Chao.xiang
Join Date: Mar 2017
Posts: 9
Rep Power: 9 ![]() |
Quote:
After I change the outflow pressure,The TKE also incrases to 1000+. The value of 2.728e5 is from Wave of Ricardo.Now I don't know how to solve the problem? I need your help,Could you give me some suggestions? Thank you,again! |
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#9 |
Senior Member
Tobias
Join Date: May 2016
Location: Germany
Posts: 302
Rep Power: 11 ![]() |
Do you have fixed, constant pressures for Inflow and Outflow boundary?
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#10 |
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Chao.xiang
Join Date: Mar 2017
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#11 |
Member
Tristan Burton
Join Date: Sep 2017
Posts: 92
Rep Power: 9 ![]() |
Hello,
Quick clarification: Just before the intake valve opens, the cylinder pressure is 3.45 bar and the intake port pressure is 1.82 bar? I would expect that this would drive flow into the intake port. Is there valve overlap? Best regards, Tristan |
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