Shell and tube heat exchanger modeling

hmasenger · January 19, 2014, 11:37

hi
i am modeling a shell and tube heat exchanger with 42 cold tubes .
i have used one fluid domain for all the tubes and the cfx solver turns out to an error saying you have 42 isolated bodies!!. so do you think i should use 42 domains for every single tube ??!
am i right about the error?
i know there is something wrong about the interface but i don't know what exactly it is!
i made one named selection set for coils outside surfaces and one for shell internal surfaces where it is in contact with coils and then selected these two for fluid fluid interface sides. is there any thing wrong with this process?

regards

ghorrocks · January 19, 2014, 17:50

I think you will find you will get isolated fluid volume error regardless of whether you use 1 domain or 42 domains.

To get this to run you are going to have to use the isolated fluid volumes expert parameter. Search the forum to find the exact keyword.

hmasenger · January 20, 2014, 02:47

Yup . I have turned off the isolated geometry check in expert parameters and problem solved.tnx glenn

ghorrocks · January 20, 2014, 04:36

You might have convergence problems with isolated volumes that is why the check is there! Your volumes look identical so you will probably be able to get away with it.

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January 19, 2014, 17:50		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	I think you will find you will get isolated fluid volume error regardless of whether you use 1 domain or 42 domains. To get this to run you are going to have to use the isolated fluid volumes expert parameter. Search the forum to find the exact keyword.

January 20, 2014, 02:47		#3
hmasenger Senior Member hamed Join Date: Apr 2009 Posts: 148 Rep Power: 17	Yup . I have turned off the isolated geometry check in expert parameters and problem solved.tnx glenn

January 20, 2014, 04:36		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	You might have convergence problems with isolated volumes that is why the check is there! Your volumes look identical so you will probably be able to get away with it.