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Impinging Jet and Turbulence Model Comparisons

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Old   April 15, 2014, 13:55
Default Impinging Jet and Turbulence Model Comparisons
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Mark
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I have conducted a study and simulated an impinging jet in Ansys Fluent with three models. SST, K-Epsilon Standard and Spalart. For the wall jet I have chosen 4 distances increasing the distance from the stagnation point to measure the radial velocity.

I am just in the process of comparing all the models to the LDA data I have collected and it appears that despite all the research I have done the Spalart model has the closest agreement with the experimental data. I was just curious, of the three models, based on previous research and reading, am I right in saying the SST should have performed better due to it using a combination of K-Omega and K-Epsilon models? When I look at my SST model it appears that both the Spalart and K-Epsilon Standard have better agreement. Can anyone help me understand why this maybe? I have looked at possible grid refinements and conducted a Grid Independent study before hand. I am just trying to understand the physics behind it as I am new to CFD.

Many thanks

MM
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Old   April 15, 2014, 16:42
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Filippo Maria Denaro
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hello,
could you plot the results? how do you compute the statistical velocity from LDA?
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Old   April 16, 2014, 09:22
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Here are the results as non-dimensionalised XY plots as requested. If someone could point me in the right direction as to possible resaons for diffreences that would be fantastic?

Thanks again.

MM
Attached Images
File Type: png K-Epsilon Standard.png (12.6 KB, 13 views)
File Type: png K-Omega SST.png (13.8 KB, 9 views)
File Type: jpg Spalart Model.jpg (32.1 KB, 8 views)
File Type: png SST Transition.png (13.2 KB, 8 views)
File Type: png LDA Data.png (12.8 KB, 9 views)
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Old   April 16, 2014, 12:23
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without details about the LDA measurement is not possible to give insight...especially the values measured around r->0 are suitable?
furthermore, you should put together the different solutions on the same figure for several r/D values.
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