in turbomachines, a large number of numerical approaches have been proposed, which have become
more and more accurate, as computing power has increased.
The first methods, developed at the beginning of the 1970s, were based on linear approaches where
every equation is linearized [1] [2]. Since the 1990s, new time-linearized methods have been widely
developed. According to these approaches, the flow is decomposed into a non-linear steady flow plus
a small-perturbation harmonic unsteady flow [3] [4] [5] [6] [7]. In recent years, non-linear methods
have become a viable alternative and several non-linear (uncoupled and coupled with structural
solver) approaches have been implemented [8] [9] [10] [5] [11] [12] [13]. Although computationally
expensive, these methods are able to include non-linear effects into aeroelastic analysis.
The aim of this paper is to present the application of two numerical methods (a time-linearized
method and a non-linear one) to the flutter analysis of a turbine test rig measured by the EPFL (Ecole
Polytechnique Fédérale de Lausanne, Switzerland), within the European research project FUTURE.
The numerical results are compared with each other and with the experimental data.
in turbomachines, a large number of numerical approaches have been proposed, which have becomemore and more accurate, as computing power has increased.The first methods, developed at the beginning of the 1970s, were based on linear approaches whereevery equation is linearized [1] [2]. Since the 1990s, new time-linearized methods have been widelydeveloped. According to these approaches, the flow is decomposed into a non-linear steady flow plusa small-perturbation harmonic unsteady flow [3] [4] [5] [6] [7]. In recent years, non-linear methodshave become a viable alternative and several non-linear (uncoupled and coupled with structuralsolver) approaches have been implemented [8] [9] [10] [5] [11] [12] [13]. Although computationallyexpensive, these methods are able to include non-linear effects into aeroelastic analysis.The aim of this paper is to present the application of two numerical methods (a time-linearizedmethod and a non-linear one) to the flutter analysis of a turbine test rig measured by the EPFL (EcolePolytechnique Fédérale de Lausanne, Switzerland), within the European research project FUTURE.The numerical results are compared with each other and with the experimental data.
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