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Heat transfer problem

Posted 6 juin 2012, 08:31 UTC−4 Fluid & Heat, Heat Transfer & Phase Change Version 4.2a 2 Replies

Clément Devaux
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Hi,

I want to simulate water (10°C) flow past an ice(0°C) cylinder and heat transfer at the interface between ice and water, so temperature of the water around the cylinder should decrease in all of its points, but I see weirdly that there are some points which have temperature even more than the initial temperature. It makes no sense.

PS: i run this in 2D, mesh=finer and during 10s with a 0.1s step time.

If someone could help me it would be very kind,

Thanks

2 Replies Last Post 7 juin 2012, 04:59 UTC−4
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 7 juin 2012, 02:16 UTC−4
Hi

this is often due to wrong mesh densities related to the time stepping and the fluid heat diffusivity, ahve you checked the coherence of your mesh w.r.t. your physics ?

a mesh is as the "sampling" if you undersample a sound record you get weird notes out, the same for FEM

--
Good luck
Ivar
Hi this is often due to wrong mesh densities related to the time stepping and the fluid heat diffusivity, ahve you checked the coherence of your mesh w.r.t. your physics ? a mesh is as the "sampling" if you undersample a sound record you get weird notes out, the same for FEM -- Good luck Ivar
Clément Devaux
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Posted: 1 decade ago 7 juin 2012, 04:59 UTC−4
Thanks for your answer, i will check this right now.
Thanks for your answer, i will check this right now.

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