Fluent - High Skewness in solids
Hi, Iam simulating water flow (+-9m/s) in nuclear reactor.
Skewness everywhere in water domain is <0,98. I have 4 cells out of 4,5 milion with higher skewnes which I can't reduce it by any means. One of them is 0,995. Will this be a problem if that cell is in solid domain? Is skewnees just a matter of concern in fluid domains? |
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Could you share with your meshing. Are cells having higher skewness in relatively considerable location? |
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and, I would like to see mesh you have done by sending me (onrzcan@hotmail.com)
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Hope this may help |
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Where i can find heatl flux imbalance? |
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I am not able to see the report can you paste it directly |
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-------------------------------- -------------------- interior-hpsi_2-solid -573.10658 interior-hpsi_2-solid.1 -0 interior-hpsi_3-solid 731.32575 interior-hpsi_3-solid.1 -0 interior-hpsi_5-solid 546.10172 interior-hpsi_5-solid.1 -0 interior-sachta-solid 445571.25 interior-sachta-solid-spodek-objem 0.060006303 interior-sachta-solid.1 -0 interior-sani_2-solid 178759.53 interior-sani_2-solid.1 -0 interior-sani_3-solid 178984.5 interior-sani_3-solid.1 -0 interior-sani_5-solid 149351.71 interior-sani_5-solid.1 -0 interior-spodek-objem 180.2848 interior-vstup-solid -26266.429 interior-vstup-solid.1 -0 interior-vytlak_2-solid 102403.84 interior-vytlak_2-solid.1 -0 interior-vytlak_3-solid 104384.28 interior-vytlak_3-solid.1 -0 interior-vytlak_5-solid 107002.32 interior-vytlak_5-solid.1 -0 ---------------- -------------------- Net 0 Total Heat Transfer Rate (w) -------------------------------- -------------------- ---------------- -------------------- Net 0 Radiation Heat Transfer Rate (w) -------------------------------- -------------------- ---------------- -------------------- Net 0 |
you could just look for inlet and outlet mass flow rate. (that means mass imbalance), that is valid for continuity equation.
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Mass Flow Rate (kg/s) -------------------------------- -------------------- inlet-1 1422.3698 inlet-4 1411.0393 inlet-6 1419.4875 inlet-hpsi2 -0 inlet-hpsi3 -0 inlet-hpsi5 -0 inlet-sani2 1412.9978 inlet-sani3 1411.938 inlet-sani5 1410.2048 outlet-dno -8488.2092 ---------------- -------------------- Net -0.17198306 Inlets at HPSI are at start of transient 0 kg/s, so this is ok... Is the net imbalance ok? What could be the reason of such inbalance? > Total Heat Transfer Rate (w) -------------------------------- -------------------- inlet-1 1.4806849e+09 inlet-4 1.4688201e+09 inlet-6 1.4776143e+09 inlet-hpsi2 -22109.282 inlet-hpsi3 -20397.35 inlet-hpsi5 -26342.82 inlet-sani2 1.4695309e+09 inlet-sani3 1.4697556e+09 inlet-sani5 1.4679514e+09 outlet-dno -8.8342267e+09 ---------------- -------------------- Net 61699.701 |
as far as I am concerned, mass balance difference is very high (0.172 kg/s ), equals to 619,2 kg/hour
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if you are solving for heat transfer, second order upwind schemes give better convergences, which discrete schemes has you chosen? (momentum,energy and turbulence (if there is )
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and materials? could you write in or show screenshots?
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Steel 7800 kg/m^3 http://imgur.com/a/OlTny |
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