A NUMERICAL-SOLUTION OF 3D INVISCID ROTATIONAL FLOW IN TURBINES AND DUCTS

The numerical solutions of inviscid rotational (Euler) hows were obtai ned using an explicit hexahedral unstructured cell vertex finite volum e method. A second-order-accurate, one-step Lax-Wendroff scheme was us ed to solve the unsteady governing equations discretized in conservati ve form. The transonic circular bump, in which the location and the st rength of the captured shock are well predicted, was used as the first test case. The nozzle guide vanes of the VKI low-speed turbine facili ty were used to validate the Euler code in highly 3D environment. Desp ite the high turning and the secondary flows which develop, close agre ements have been obtained with experimental and numerical results asso ciated with these test cases. (C) 1998 John Wiley & Sons, Ltd.