Numerical Simulation of the Flow in a Turbopump Inducer in Non-Cavitating and Cavitating Conditions
A numerical methodology for the simulation of cavitating flows in real complex geometries is presented. A homogeneous-flow cavitation model, accounting for thermal effects and active nuclei concentration, which leads to a barotropic state law is adopted. The continuity and momentum equations are discretized through a mixed finite-element/finite-volume approach, applicable to unstructured grids. A robust preconditioned low-diffusive HLL scheme is used to deal with all speed barotropic flows. Second-order accuracy in space is obtained through MUSCL reconstruction. Time advancing is carried out by a second-order implicit linearized formulation together with the Defect Correction technique. The flow in a real 3D inducer for rockets turbopumps is simulated for a wide range of conditions: different flow rates and rotating speeds as well as non-cavitating and cavitating flows are considered. The results obtained with this numerical approach are compared with experimental data.
Keywordscavitating flows homogeneous flow model low diffusive HLL scheme linearized implicit time advancing
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The support of the European Space Agency under Contract number 20081/06/NL/IA is gratefully acknowledged. The authors also wish to thank the Italian Computer Center CASPUR for having provided computational resources and support.
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