# turbulence intensity

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 December 26, 2003, 21:25 turbulence intensity #1 co2 Guest   Posts: n/a When at a velocity inlet I decide to use 'Intensity and Hydraulic Diameter' as the Turbulence Specification method ... What does the Intensity value mean ? If I change the intensity from 5% to 10% how is it going to affect my solution?

 December 27, 2003, 18:06 Re: turbulence intensity #2 ashu Guest   Posts: n/a Turbulent intensity is measure of fluctuation in average velocity due to tubulence in flow, and is written as: TI = sqrt((u'^2+ v'^2+w'^2)/3)/Uinf These are time averaged velocity . this value would have influence on boundary layer... This means that how much fluctuation you're assuming at the inlet/outlets.... If use high value then it would have effect of convergence, use it deligently to get converged solution.... solve at 5% and compare the results at 10%, check your output variable, how it changes.... this would depend on mesh density.... Get convergence with low disturbance and increase the disturbance if required....

 December 27, 2003, 18:41 Re: turbulence intensity #3 co2 Guest   Posts: n/a thank you ashu. that certainly helps