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Old   March 18, 2006, 08:04
Default 2-stroke engine combustion
  #1
A Student
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Hello,

In .info file I get following warnings. 1)#060-DENSITY OUT OF BOUND DUE TO PRESSURE CORRECTION 2)#060-NEGETIVE DENSITIES FOUND 3)#065-OUT OF BOUND VALUE FOR SCALAR VARIABLE ENTH.

Right after these warnings my solution diverges.

I would really appreciate if you can help me.

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Old   March 22, 2006, 10:57
Default Re: 2-stroke engine combustion
  #2
goody
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Hello friend,

I am working in 2 stroke engines filed. already i have developed a 2 stroke diesel engine for low powered application ( my diesel engine has a Spark pllug !)

I am passisionate about 2 stroke engines ...i hold a degree in car engineering .I know CFD packages Fluent and ANSYS.. If u could send me the CD ( compact disc ) of STAR-CD i will learn that software too and we both can work on it.

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Old   March 22, 2006, 17:42
Default Re: 2-stroke engine combustion
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A Student
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Hi,

I shall ask my prof. if he let me borrow the CD.

Meanwhile, Can you advise me how to set boundary conditions in the connecting region between combustion chamber and inlet/exhaust ports? I guess reason behind above errors is boundry condition.

Thanks in advance.

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Old   April 23, 2006, 11:12
Default Re: 2-stroke engine combustion
  #4
Mohsen
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hi I get the same error! I am workin on unsteady state flow simulation in exhaust manifold by CFD,. did u find any clue for it?
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Old   April 23, 2006, 11:24
Default Re: 2-stroke engine combustion
  #5
a student
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Hi Mohsen,

Poor me. I am still trying to solve that negetive dinsity error, the only thing I inproved is previously I was getting this error at the first event of expansion stroke but now I somehow managed to rich few more events in expansion stroke,till when ports attach to the cylinder(2-stroke engine). Then same old error. What I did was refined my mesh and decrease the time scale.

Wish you good luck my friend.
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Old   June 1, 2006, 12:16
Default 2-stroke engine combustion Influence of Humidity
  #6
Eduardo SALAMONE
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Dear Sir,

I am interested in getting information in the comparison readings under differents ambients conditions, since we have tracks at different barometric pressure and humidity.

Letīs start to talk about.

My best regards thank,

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