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-   -   STAR-CD 4.18 cannot generate liquid film?? (http://www.cfd-online.com/Forums/star-cd/111717-star-cd-4-18-cannot-generate-liquid-film.html)

skylent January 14, 2013 04:39

STAR-CD 4.18 cannot generate liquid film??
 
Dear all,
I want to calculate the liquid film in gasoline direct injection engine.
However, I met a strange problem.
When I use sTAR-CD 4.16 to do it, the liquid film can be generated normally.
But when I use STAR-CD 4.18, the liquid film thickness and mass is always zero.

Did anyone here meet this problem and help me?
Thanks in advanece.

wernsen June 23, 2013 08:15

I had the same problem while playing with the wall film tutorial. I figured out that turining on the "droplet to film transition" in liquid films->film controls fixed that.

have a try
Martin

skylent June 23, 2013 21:41

Thanks Martin,I got it!

Quote:

Originally Posted by wernsen (Post 435438)
I had the same problem while playing with the wall film tutorial. I figured out that turining on the "droplet to film transition" in liquid films->film controls fixed that.

have a try
Martin


wernsen June 25, 2013 06:29

was this the problem?

skylent June 25, 2013 22:05

I also tried in STAR-CD 4.16, the results almost the same no liquid film.
The support in CD-adapco told me that the wall temperature I set is higher than the boiling point of gasoline. So I should increase the Bs coefficient(default 1.0,Bai model) to a larger value such as 1.5.

Quote:

Originally Posted by wernsen (Post 435766)
was this the problem?



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