STAR-CD 4.18 cannot generate liquid film??

skylent · January 14, 2013, 03:39

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, 07:15

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, 20:41

Thanks Martin,I got it!

Quote:

Originally Posted by wernsen

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, 05:29

was this the problem?

skylent · June 25, 2013, 21:05

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

was this the problem?

January 14, 2013, 03:39	STAR-CD 4.18 cannot generate liquid film??	#1
skylent Member zheng jianjun Join Date: Jan 2010 Posts: 46 Rep Power: 16	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.

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June 23, 2013, 07:15		#2
wernsen Member Martin Join Date: Nov 2011 Posts: 35 Rep Power: 14	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

June 25, 2013, 05:29		#4
wernsen Member Martin Join Date: Nov 2011 Posts: 35 Rep Power: 14	was this the problem?