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Rheology in CFX reliable??

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Old   June 25, 2022, 16:57
Default Rheology in CFX reliable??
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Is there an easy way to run a non-newtonian laminar flow simulation (polymer melt) that brings up reliable results?
Emphasis really lays on "easy"

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Old   June 26, 2022, 07:39
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Yes. Give it to a CFD expert and they can do the work and give you the results. Easy.

Non-Newtonian flow is complex and adds considerable complexity both physically and numerically. If you are not an experienced CFD operator taking on a simulation which strong non-Newtonian properties is a bad idea. But note that materials which are only slightly non-Newtonian are not much harder than Newtonian materials. It is all a matter of degree.
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Old   July 4, 2022, 04:05
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I have done multiple simulations on rubber melts inside a geometry (internal flow). Depending on the question you want to answer, this works pretty well.

However, forget simulating viscoelastic effects, especially in external die flows. You'll never be able to capture this well using CFX. Then you should switch to Polyflow, or other specialized software packages.
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