scholarly journals Adaptive reduced-order modeling for non-linear fluid-structure interaction

2021 ◽  
pp. 105099
Author(s):  
Ali Thari ◽  
Vito Pasquariello ◽  
Niels Aage ◽  
Stefan Hickel
Keyword(s):  
Fluid Structure Interaction ◽  
Reduced Order Modeling ◽  
Fluid Structure ◽  
Reduced Order ◽  
Structure Interaction ◽  
Non Linear

scholarly journals Reduced order modeling of fluid/structure interaction.

2009 ◽  
Author(s):  
Matthew Franklin Barone ◽  
Irina Kalashnikova ◽  
Daniel Joseph Segalman ◽  
Matthew Robert Brake
Keyword(s):  
Fluid Structure Interaction ◽  
Reduced Order Modeling ◽  
Fluid Structure ◽  
Reduced Order ◽  
Structure Interaction

Extending a Van der Pol Based Reduced-Order Model for Fluid-Structure Interaction Applied to Non-Synchronous Vibrations in Turbomachinery

2021 ◽  
Author(s):  
Richard Hollenbach ◽  
Robert Kielb ◽  
Kenneth Hall
Keyword(s):  
Fluid Structure Interaction ◽  
Reduced Order Model ◽  
Van Der Pol Oscillator ◽  
Previous Model ◽  
Stable Limit ◽  
Order Model ◽  
Van Der Pol ◽  
Fluid Structure ◽  
Reduced Order ◽  
Structure Interaction

Abstract This paper expands upon a multi-degree-of-freedom, Van der Pol oscillator used to model buffet and Nonsynchronous Vibrations (NSV) in turbines. Two degrees-of-freedom are used, a fluid tracking variable incorporating a Van der Pol oscillator and a classic spring, mass, damper mounted cylinder variable; thus, this model is one of fluid-structure interaction. This model has been previously shown to exhibit the two main aspects of NSV. The first is the lock-in or entrainment phenomenon of the fluid shedding frequency jumping onto the natural frequency of the oscillator, while the second is a stable limit cycle oscillation (LCO) once the transient solution disappears. Improvements are made to the previous model to better understand this aeroelastic phenomenon. First, an error minimizing technique through a system identification method is used to tune the coefficients in the Reduced Order Model (ROM) to improve the accuracy in comparison to experimental data. Secondly, a cubic stiffness term is added to the fluid equation; this term is often seen in the Duffing Oscillator equation, which allows this ROM to capture the experimental behavior more accurately, seen in previous literature. The finalized model captures the experimental cylinder data found in literature much better than the previous model. These improvements also open the door for future models, such as that of a pitching airfoil or a turbomachinery blade, to create a preliminary design tool for studying NSV in turbomachinery.

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