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angular momentum in swirling flows

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Old   October 20, 2007, 11:21
Default angular momentum in swirling flows
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Roberto
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Hi, I am working with CFD to analyze a swirling burner with a square section combustor. When I calculate the angular and the axial momentum inside the combustor, it decreases the more I check downstream to the burner exit. Do you know what would create a decrease in the angular and axial momentum inside a square section combustor? Should the swirl number variate inside the combustor?

Thank you very much for your help.
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Old   October 21, 2007, 22:06
Default Re: angular momentum in swirling flows
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Glenn Horrocks
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Hi,

Some possible causes: Viscous drag at the walls, turbulence generation, separations causing losses, inaccurate simulation.

Glenn Horrocks
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Old   October 22, 2007, 04:22
Default Re: angular momentum in swirling flows
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Roberto
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Thanks for your answer. Do you know some references about it or how they are modifing the momentum?

Thanks again for your help.
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Old   October 22, 2007, 07:05
Default Re: angular momentum in swirling flows
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Glenn Horrocks
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Hi,

Look in the literature for swirling flows, such as cyclone separators. For modelling accuracy issues read the documentation or for more detail see Roache's book "Computational Fluid Dynamics".

Glenn Horrocks
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