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40 5. RESULTS Figure 5.3. Result from RANS and LES computations. Streamwise component half a diameter downstream of the bend. Table 1. RMS value of ∂U/∂ζ at the exit of the bend. Inlet profile Eccentric 1 Eccentric 2 Eccentric 3 Swirl RMS (∂U/∂ε) 0.093 0.046 0.16 0.55 5.1.3. Pulsatile flow in a double bent pipe The pulsatile flow in the double bent pipe has been computed with both the RANS and the LES approach. In this section, the results from the LES com- putations are presented. During the acceleration phase of the inlet velocity, the Dean vortices are created in the first bend. At the outer part of the entrance to the first bend a recirculation zone is located during the whole pulse period, except when flow reversal occurs. The recirculation is an effect of the adverse pressure gradient in the streamwise direction at the outer wall. At the entrance to the second bend, the maximum velocity region is located at the inner wall, which means that the region of maximum velocity is rotated 90◦ from the exit of the first bend. The secondary flow downstream of the second bend is dominated by a swirling motion and the Dean vortices formed in the second bend. One of the DeanPDF Image | Numerical computations of the unsteady flow in a radial turbine
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