problem in validation on naca 0012
hello everyone
i am simulating naca 0012 with ansys fluent. i am trying all of the turbulent models(like spallart,k-e , k-w sst , and transition sst models),the conclusion was that the best model is sst transition and k-w sst. in transition sst model bubble is showed but in k-w sst it doesnt . y+ in my calculating is below1 and i have used c-grid, bundry condition is that the left and bottom surface is the inlet and the straight right and upper surface are pressure outlet . Re is about 8*10^4 i am simulating in low re numbers and M=0.023 v=8m/s. i have got some problem first of all i have no results that i can use them to valid my solution in this Re number . the second problem is that(when i compare the solution of the theory wing section book i found out that the in range of reynolds number the Cl is the same at the Re number shown! in angle of 8 is about 0.8) when i compare my Cl that is 0.06 i found out that i have got some mistake please help sorry of my bad english |
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Abour the Cl, it seems like the adimensionalization is not done correcty, have u checked it? |
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thanks for your response Cl that i get is from here : report,forces, and the vector that is Perpendicular to the velocity vector.am i right? i dont know anything about xfoil and what you said for validation,would you please help me more about validation, in models that i have used,k-w and transition were better than other but transition sst was showing the sepration bubble and other models did not! i am using steady state to calculating! |
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http://www.cfd-online.com/Forums/dat...BJRU5ErkJggg== About validation, is quite tough, the program that I told u, may be u can dinf a tutorial on the Internet. It is only for Nacas and easy to used. And about the other... it is quite complicated if u haven't studied them in an Aerodynamics subject. However, about the models, I can help u out. I was doing some simulations about the performances of a cycling wheel and used a paper called 'Ten Years of Industrial Experience with the SST Turbulence Model' (About SST Transition Model) and 'Improved Two-Equation k-omegaTurbulence Models for Aerodynamic Flows'. U will find there everything that u need it |
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About the y+ value, do the inflation operation on the Mesh and everything will be alright. Because y+ depends of the wide of the first layer |
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in xfoil? Re number is calculated with this chord , should i import it ? if you mean in ansys, i scaled there |
hi every one
my problem solved with ansys help finally thank you all |
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