Gert-Jan |
May 27, 2019 03:32 |
Quote:
Originally Posted by oliveira1820
(Post 734836)
I noticed that the density only varies locally, the mean value is the same during all the simulation, so mass is conserved.
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You might observe that mass is conserved on global scale. But on local scale it can be completely different. Already one element can screw up your whole calculation.
Quote:
Originally Posted by oliveira1820
(Post 734836)
My doubt is, I´m heating the water with 1000W (not considering phase change or gas presence) and the pressure doesn´t increase when I use cosntant denisty and specific heat, but it increases allot with IAWPS water material.
I know that with the molecules vibrations increasing the force on the walls hould too (pressure), WhY DOSENT ICNREASES?
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I don't know al the details of all your models. I would stay away of the IAWPS models and stick to temperature depedent water properties (cp, labda), but constant density. Then, outside CFX, determine the pressure using the average temperature inside your container, and the expansivity.
Bottom line, CFX is a flow solver where a lot of models can be added. But vibrating molecules...... Sure kinetic effects are somewhere incorporated in one of the submodels. But I am not sure what your idea and expectations are. I would contact your supervisor what to do.
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