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Problem with modelling heat exchanger(fluid-solid-fluid-solid) |
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December 16, 2013, 09:21 |
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#21 |
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Philipp
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Location: Germany
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Ok, where is the line located (regarding x-direction)? In the middle of your pipe?
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December 16, 2013, 09:30 |
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#22 |
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saman poura
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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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December 16, 2013, 09:37 |
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#23 |
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Philipp
Join Date: Jun 2011
Location: Germany
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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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December 16, 2013, 09:41 |
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#24 |
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saman poura
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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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December 16, 2013, 10:50 |
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#25 |
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Philipp
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Location: Germany
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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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December 16, 2013, 17:36 |
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#26 |
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saman poura
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thank u very much
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Tags |
fluid-solid-fluid-solid, heat exchanger model, two-sided wall, wall thickness |
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