The coefficients , , , and , as well as and for the Roberts flow, calculated in the second-order correlation approximation, as functions of k ⊥ /kf, where is the effective wavenumber of the flow. Results obtained with kx = ky and or are represented by open squares and dotted lines or by open diamonds and dashed lines, respectively. Results with kx/ky = 0.75 [k ⊥ = (3,4,0)k1] or kx/ky = 5 [k ⊥ = (5,1,0)k1] and k∥/k ⊥ = 0.2 are indicated by open or filled circles, respectively. Orange and black symbols correspond to the first and second expressions for and in (21) or for in (26).
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