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Old   December 9, 2009, 11:27
Default Mechanisms of turbulence production
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Mike
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I'm doing tutorial 9 in cfx and I am trying to answer a question about the main mechanisms of turbulence production in the different principal regions of the flow, can anyone tell me what this means please? I have attached a plot of eddy viscosity along the pipe.

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Old   December 9, 2009, 16:35
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Sounds like you need to read a turbulence textbook. Have a look at "Turbulence Modelling for CFD" by Wilcox. It will explain turbulence generation mechanisms nicely.
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Old   December 9, 2009, 17:20
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Thanks very much, I'll give that a look.

I spoke to someone who said that it is generated due to the deep velocity gradients but I'm looking for a more detailed explanation so hopefully this textbook will give me that
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Old   December 10, 2009, 06:22
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If you want the one-sentence answer, then yes, shear layers are a common source of turbulence.
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Old   December 10, 2009, 13:28
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what exactly are shear layers?
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Old   December 10, 2009, 17:00
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Regions of high fluid shear, for example boundary layers or the edge of fluid jets. Again, refer to the textbook I mentioned above.
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