Parallel Computation of Stator-Rotor Interaction in an Axial Turbine

The unsteady flow caused by the interaction of guide vanes and runner is investigated for an axial turbine. The calculation is performed in parallel. The solution algorithm and the parallelization procedures are described. The parallelization is obtained by domain decomposition with overlapping meshes. The interaction of rotor and stator is handled by a sliding interface where downstream the node values are interpolated and upstream the flux integrals are exchanged. The simulation results are compared with measurements. NOMENCLATURE G Production term in kand ε-equations P mean pressure Ui mean velocity components c1, c2, cμ coefficients in the kand ε-equations k turbulent kinetic energy t time xi cartesian coordinates Ωi rotation vector ε dissipation rate εijk coss-product tensor ν kinematic viscosity νt turbulent viscosity ρ density σk, σε Prandtl/Smith number for kand ε-equations