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Old   September 19, 2007, 11:22
Default Help needed in KIVA 3v
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Hi, I am working in Kiva 3v and i am working with Hydrogen combustion modeling in Kiva 3v.My problem is the instant i give spark,pressure is rising very rapidly only for 1 or 2 degree change in crank angle, which is not at all in possible actual case. can anybody suggest how to reduce this steep pressure rise i.e.what parameter i have adjust to change this?

Thanks in advance for your help...
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Old   September 20, 2007, 10:45
Default Re: Help needed in KIVA 3v
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Hi, I am also working with hydrogen combustion in internal combustion engines. What you can do is to reduce the computational time step, for example 0.1 crank angle, when the combustion starts and for the whole combustion period. When this is over, you can set again the time step to higher values, for example 1 crank angle etc. Hope this works
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Old   October 10, 2007, 04:52
Default Re: Help needed in KIVA 3v
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Yes! That is very much possible, the properties of Hydrogen decides the rate of burning, and you know that Hydrogen is highly explosive.

One thing you can try. give very less hydrogen per one air unit. Swirl and Swish also you have to adjust.

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Old   October 11, 2007, 08:20
Default Re: Help needed in KIVA 3v
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i had tried with different swirl ratios but i am not getting the reduction in peak pressure rise. that it is when the combustion starts at some instant the pressure will raise from 20 bar to 55 bar only for one degree change in crank angle. if possible suggest me any other parameters which i have to adjust in KIVA 3v
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Old   September 15, 2009, 16:50
Default Kiva 4
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Vijay Mohan
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Am new to Kiva, as a matter of fact to open source coding as well, can anyone plz tell me where i can find proper material to get started with???

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