Need to find as much information as possible about doing 1-D network modeling for SI engines, as a measure in designing an engine breather system. Can anyone help? Thanx

http://www.gtisoft.com/

I thought you Lotus guys already had your own in-house 1D code that you (used to??) market externally too.

At least that's what it says on this web site:

http://www.grouplotus.com/eng/capabi...&page=24&id=17

My plug would be for WAVE, but I'm a bit biased since I'm part of the WAVE development team.

http://www.software.ricardo.com/products/wave

Yeah, we do have a 1-D simulation programme here in Lotus. The in-house software to do engine simulation and performance testing is really great. The thing is we cant use it to simulate the internal flow (blowby,crankcase ventilation etc). The 1-D flow simulation software being used is Flowmaster, where oil lubrication and cooling systems have been designed. It is my job to do research in using 1-D flow simulation for the crankcase ventilation system, as we've never done that before. I was just looking for people who might have done similar things to discuss this matter. We've also contacted Flowmaster Inc. and they have been helpful. But, the more information I get, the better, don't you think?

Zamir,

Check this out. We use WAVE for crank-case breathing studies here.

http://www.software.ricardo.com/even..._breathing.pdf

As a research topic generating papers and research codes this subject probably peaked in the 1970s hence, as a relatively mature subject, there are quite a few books around. Benson from Manchester had a useful book and I recall a cookbook by Zinner (I think).

Not sure about the web though. Good search terms are "filling and emptying models" for the lumped quasi-steady approach to simulating the in cylinder processes. The waves in the inlet and exhaust manifolds were typically simulating using the "method of characteristics" often abbreviated to MOC. There should be loads on this but it will not all be about SI engines.

If you want commercial code all car consultancies dealing with engines will be able to provide the software. Suggest Ricardos, AVL and similar. I am somewhat surprised Lotus does not already have such software. Have you asked around?

If you want to develop a code in something like MATLAB it should only take a few days. I suspect you will probably spend longer trying to find reliable empirical data and checking than putting the code together.

Thanks so much for the tips. Lotus do have a commercial code to do this. The thing is this analysis has never been done before (as we've been relying on experimental data and experience), and it is my job now (as the most junior engineer) to do research on this topic and gather as much information as possible. Thanks again for the tips.

Thanx for the document steve, really appreciate it.

www.flowmaster.com

In FLOWMASTER one can create the 1-d network of the engine & run the simulation. One can able to run the matlablink(link is communication between matlab software & FLOWMASTER 1-D Software) One can able to run the CFDlink(link is communication between CFD(Fluent,starcd) software & FLOWMASTER 1-D Software).

well done steve, the paper is interesting for me, too. seems I am not the only one trying to use 1D gasdyn&cycle sim code for a bit unusual tasks