Hi,
I am simulating a turbine in Fluent that it has curve. Mesh is structure completely. but there is high Skewness in tip clearance and some parts of around of the blade:
http://www.upload7.ir/imgs/2014-10/99742939652347311853.jpg
When i use SIMPLEC Method, one factor (Skewness correction) appear under the SIMPLEC method in ANSYS Fluents method.
How i must adjust this factor? i dont know which number must be set?1< or 1 , 2, 3,
I used K-e turbulence model and when I set Skewness correction to 5 or 20, the following error is appeared:
"Error: Divergence detected in AMG solver: k
Error: Divergence detected in AMG solver: k
Error Object: #f"
Why does this happen?
Please suggest a way to reduce the skewness in ansys fluent and how can i check Skewness in Fluent?
Thanks.
Best.
Ali
I believe that you are using structured mesh to resolve your flow; a C-grid mesh (structured) would be better suited for the picture attached. This would resolve the flow around the curves and minimize numerical diffusion.
The divergence error could be due to the skewed elements in your tip clearance region (as you figured out). I would suggest you to alter the node distribution during your 'Blocking' using the 'Pre-Mesh Params' in ICEM CFD.
Improve the skewed elements in your mesh directly in the meshing software rather than the Fluent solver.
Look at https://psycnet.apa.org/record/2013-26838-001
https://academic.oup.com/cercor/article/19/11/2690/380518
https://d1wqtxts1xzle7.cloudfront.net/61059447/ANALYSIS_OF_THE_NON-ORTHOGONALITY_CORREC20191029-15420-1z0z0g1.pdf?1572368393=&response-content-disposition=inline%3B+filename%3DAnalysis_of_the_Non-Orthogonality_Correc.pdf&Expires=1592971087&Signature=gpK8V8Mt~yyokONZKcsnTVUxONHR5aSYHfP1voTeNbiTJQVATh42COM8VQfwadKgQNQZXmP5Ahtm0etyUENRidAhFQy3uElNio8v-tpqTS0sPH0V8hhwtKaNc-odoQ0VBATnpsq8Z53f-2LuEeGL4LCoJOJiXFx0Ge6wRGortZ-x5pSGFaJfiXlo6vr~pUODyMBJZ9Ga6Fi1q0bhD3NmSL-FKcUqhJ7vF3ASaWc5T~nh6Gk1j7lBatVtGmDFmOapa4d9MSHdNbQadrvWrI0VKevFjJ-9AAf2KhjJYT5rGAhDMmWNAfEPQ-kWmCsyKBKr~Az46mM83BipUpY0eTKXcA__&Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA
https://engineering.stackexchange.com/questions/6071/how-do-i-set-skewness-correction-in-fluent
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