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October 31, 2024 at 8:53 amabdullahhassanSubscriber
Hi,
I am doing a multiphase simulation on shell and tube heat exchanger but the mesh count is around 9million which is too high.Â
1- To reduce the mesh size, i want to use thin wall at shell and tube walls but i am unsure how to create a shell wall? (If i create a circule and extrude it in spaceclaim, it makes a surface and not a solid. )
2- Second is, will thin wall create trouble by generating low mesh quality because of its thin size?
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October 31, 2024 at 9:43 amRobForum Moderator
A thin wall in Fluent is a surface in CAD and Meshing. We just define it as a wall, and Fluent then creates a wall:shadow to account for it having two sides. You can then assign it a material type (metal usually) and a thickness. The thickness is virtual. It's covered to some extent in the User's Guide and likely in the Intro level courses in Learning.Â
As there is no thickness there is no mesh inside the wall. However, exercise caution if you use inflation mesh as the "ends" may give a skew cell as the aspect ratio can be high.Â
Finally. Running a two domain model in Fluent with multiphase can be problematic. Do you really have multiphase or is it just single phase on each side, ie vapour on tubeside and liquid on shellside?
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October 31, 2024 at 1:53 pmabdullahhassanSubscriber
Ok. understand well about thin wall. drawing high skew was also my concern.
ButÂ
I want to simulate multi-phase on both side: shell & tube but Yes, i tried this before and it was a mess.ÂIs there any way to couple shell side heat transfer to wall and from wall to tube side heat absorption?Â
or something like ; To simulate two different simulations (one for shell side) and (second for tube side) together but the heat transfer from shell to tube is linked somehow. (Sorry, if it sounds weird, i am checking the possibility)
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Or is there anyway that i will simulate shell side with thermal boundary condition and I can save the variable heat (changes with positions of tube) that the tube wall absorbs and give it as a thermal BC for tube side simulation?
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October 31, 2024 at 1:59 pmRobForum Moderator
Have a look at Fluent-Fluent system coupling. I'd start by modelling both sides independently and assuming temperature/heat flux conditions to figure out the various model constants & mesh requirements. This is NOT a simple application so expect to spend a considerable amount of time learning and testing before running anything big.Â
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October 31, 2024 at 2:29 pmabdullahhassanSubscriber
Thankyou Rob, I will check on it.Â
Or is there anyway that i will simulate shell side with thermal boundary condition and I can save the variable heat (changes with positions of tube) that the tube wall should absorbs and give it as a thermal BC for tube side simulation?
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October 31, 2024 at 2:56 pmRobForum Moderator
Yes, read up on Profiles.Â
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