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Problem with modelling heat exchanger(fluid-solid-fluid-solid)

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Old   December 16, 2013, 08:21
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Ok, where is the line located (regarding x-direction)? In the middle of your pipe?
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Old   December 16, 2013, 08:30
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line start from the cennteral point of iner pipe and end on outer surface of outer pipe
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Old   December 16, 2013, 08:37
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Yes, but regarding x-direction?
Also, if you don't have periodic b.c. in x-direction: Where did you make the contour plot and what b.c. did you set for the inner (solid) pipe at the pipe's ends?
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Old   December 16, 2013, 08:41
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can u give me a email and i send u cas and data?
i cant find the problem ):
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Old   December 16, 2013, 09:50
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Look at your velocity profile. This looks like a rectangular function. This can't work.

Your problem is, that
1) Your fluid mesh is much too coarse. You only have 10 gridpoints for a pipe flow that probably is turbulent.
2) You don't use a turbulence model.

-> Make the mesh much finer and use a turbulence model.
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Old   December 16, 2013, 16:36
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thank u very much
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fluid-solid-fluid-solid, heat exchanger model, two-sided wall, wall thickness

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