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Hussam March 7, 2009 00:41

Swirl and Tumble Ratios in IC Chamber - Turbulence
I am a novice who is contrasting the turbulence characteristics of the flow field inside a combustion chamber of a 4 stroke direction injection IC engine during the intake and compression stroke resulting from crankshaft RPM variation. (i.e. 2000 RPM vs 3000 RPM, for example) In order to analyse the turbulence intensity, I need to find out the swirl and tumble ratios in the control volumes. The experiment is performed in Fluent 6.3.26 2DDP on a single cylinder four stroke engine under unsteady turbulent conditions using the k-ε turbulence model.

Coming to the crux of my dilemma, I have been unable to find an option for calculating either tumble or swirl ratios in the Solve --> Monitors ---> Volume option boxes. Mathematically, the swirl and tumble ratios (in a non-dimensional form) are calculated by the effective angular speed of in-cylinder air motion divided by the engine speed and the effect angular speed is the ratio of the angular momentum to the angular inertia of moment. Is it possible to get Fluent to give me either the swirl/tumble ratios directly or the angular momentum/angular inertia in the x, y and z directions? I am at a complete loss as to which parameters to use.

Thank you for your help in advance!

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