Abstract— Unsteady interaction phenomena created by the influence of the blade spacing have been reported in earlier experiments and CFD. However cyclic load changes in start-up and slow-down of the hydrodynamic torque converter operation have been beyond access to the current flow field calculation methods due to the extensive computer run time and memory requirements in the application of time dependent Navier-Stokes solvers to acceleration and deceleration. Therefore computations based on the use of 1D mean-line flow simulation supported by optimised flow correction coefficients tuned in rig-test experiments enable to obtain solutions for engineering-type technical problems.
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