# Swirl und tumble number

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 November 11, 2009, 12:30 Swirl und tumble number #1 Member   Sven Degner Join Date: Mar 2009 Location: Zürich Posts: 54 Rep Power: 10 Hi Foamers, at the moment I will simulate a cylinder channel of a engine. The problem is that I will calculate the swirl and tumble number of rectangle space in the cylinder. in Cfx I try something like this switch = step( (0 [mm] - z ) / 1 [m] ) * step( ( 70 [mm] + z ) / 1[m] ) * step( ( 33 [mm] - y ) / 1[m]) * step( ( 33[mm] - x ) / 1[m]) Dy = switch * Density * ((z + 35 [mm])*Velocity u - x *Velocity w ) Jy = switch * Density * (x ^2 + (z+ 35 [mm])^2) omega_Y = volumeInt(DY)@A1/ volumeInt(JY)@A1 t = omega_Y*areaAve(Density)@O*Diam^3*pi^2/4/ph But I got no idea how this work in OpenFOAM, especially the "switch" area for the calculation to bound. i hope anyone got a idea for my proceed! thx Sven

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