Prediction of Wing Flutter Boundary Using High Fidelity Delayed Detached Eddy Simulation

2015 ◽  
Author(s):  
Jiaye Gan ◽  
Hongsik Im ◽  
Xing-Ying Chen ◽  
Gecheng Zha ◽  
Crystal L. Pasiliao
Keyword(s):  
High Fidelity ◽  
Detached Eddy Simulation ◽  
Wing Flutter ◽  
Eddy Simulation ◽  
Delayed Detached Eddy Simulation ◽  
Flutter Boundary

scholarly journals Delayed detached Eddy simulation of wing flutter boundary using high order schemes

2017 ◽  
Vol 71 ◽  
pp. 199-216 ◽  
Author(s):  
Jia-ye Gan ◽  
Hong-Sik Im ◽  
Xiang-ying Chen ◽  
Ge-Cheng Zha ◽  
Crystal L. Pasiliao
Keyword(s):  
High Order ◽  
Detached Eddy Simulation ◽  
High Order Schemes ◽  
Wing Flutter ◽  
Eddy Simulation ◽  
Delayed Detached Eddy Simulation ◽  
Flutter Boundary

DDES Analysis of Wake Vortex Related Unsteadiness and Losses in the Environment of High-Pressure Turbine Stage

2017 ◽  
Author(s):  
Dun Lin ◽  
Xinrong Su ◽  
Xin Yuan
Keyword(s):  
High Pressure ◽  
Boundary Layer Transition ◽  
Wake Vortex ◽  
High Fidelity ◽  
Strong Impact ◽  
Detached Eddy Simulation ◽  
High Pressure Turbine ◽  
Layer Transition ◽  
Eddy Simulation ◽  
Delayed Detached Eddy Simulation

In this work, the flows inside the high pressure turbine (HPT) vane and stage are studied with the help of a high-fidelity delayed detached eddy simulation (DDES) code. This work intends to study the fundamental nozzle/blade interaction with special attention paid to the development and transportation of the vane wake vortex. There are two motivations for this work. On the one hand, the high pressure turbine operates at both transonic Mach numbers and high Reynolds numbers, which imposes a great challenge to modern computational fluid dynamics (CFD), especially for scale-resolved simulation methods. An accurate and efficient high-fidelity CFD solver is very important for a thorough understanding of the flow physics and the design of more efficient HPT. On the other hand, the periodic wake vortex shedding is an important origin of turbine losses and unsteadiness. The wake and vortex not only cause losses themselves, but also interact with the shock wave (under transonic working condition), pressure waves, and have a strong impact on the downstream blade surface (affecting boundary layer transition and heat transfer). Built on one of our previous DDES simulations of a HPT vane VKI LS89, this work further investigates the development and length characteristics of the wake vortex, provides explanations of the length characteristics and reveals the transportation of the wake vortex into the downstream rotor passage along with its impact on the downstream aero-thermal performance.

Delayed Detached Eddy Simulation of a Full 3-Dimensional High-Pressure Turbine Stage: Part I — Flow Topology

2018 ◽  
Author(s):  
Dun Lin ◽  
Xiutao Bian ◽  
Xin Yuan ◽  
Xinrong Su
Keyword(s):  
High Pressure ◽  
Horseshoe Vortex ◽  
Wake Vortex ◽  
High Fidelity ◽  
Detached Eddy Simulation ◽  
Tip Leakage Flow ◽  
High Pressure Turbine ◽  
Flow Topology ◽  
Eddy Simulation ◽  
Delayed Detached Eddy Simulation

In this work, the flow inside a high pressure turbine (HPT) stage is studied with the help of a high-fidelity delayed detached eddy simulation (DDES) code. This work intends to study the flow topology in the HPT stage. There are two motivations for this work: On the one hand, high pressure turbines operates at both transonic Mach numbers and high Reynolds numbers, which imposes a challenge to modern computational fluid dynamics (CFD), especially for scale-resolved simulation methods. An accurate and efficient high-fidelity CFD solver is very important for a thorough understanding of the flow physics and the design of higher-efficient HPT. On the other hand, the wake vortex shedding and tip-leakage flow are important origins of turbine losses and unsteadiness. Built on our previous DDES simulations of HPT vane and stage, this work further investigates the flow in a full 3-dimension HPT stage. The flow topology in the HPT stage is delineated by Q-criterion iso-surfaces. The development of the horseshoe vortex and its interaction with induced vortex and wake vortex is discussed. The wake vortex transportation especially its interaction with the rotor horseshoe vortex is investigated. The flow structures in the tip clearance region are also revealed.

High-fidelity fan-noise simulations based on improved delayed detached eddy simulation

2021 ◽  
Vol 150 (4) ◽  
pp. A131-A131
Author(s):  
Takao Suzuki ◽  
Michael L. Shur ◽  
Michael K. Strelets ◽  
Andrey K. Travin ◽  
Philippe R. Spalart
Keyword(s):  
High Fidelity ◽  
Detached Eddy Simulation ◽  
Fan Noise ◽  
Eddy Simulation ◽  
Delayed Detached Eddy Simulation

Numerical study of the flow over the modified simple frigate shape

2020 ◽  
pp. 095441002097775
Author(s):  
Tong Li ◽  
Yibin Wang ◽  
Ning Zhao
Keyword(s):  
Bluff Body ◽  
Recirculation Zone ◽  
Numerical Study ◽  
Reference Value ◽  
Flow Fields ◽  
Navier Stokes ◽  
Detached Eddy Simulation ◽  
Eddy Simulation ◽  
Delayed Detached Eddy Simulation ◽  
Simulation Results

The simple frigate shape (SFS) as defined by The Technical Co-operative Program (TTCP), is a simplified model of the frigate, which helps to investigate the basic flow fields of a frigate. In this paper, the flow fields of the different modified SFS models, consisting of a bluff body superstructure and the deck, were numerically studied. A parametric study was conducted by varying both the superstructure length L and width B to investigate the recirculation zone behind the hangar. The size and the position of the recirculation zones were compared between different models. The numerical simulation results show that the size and the location of the recirculation zone are significantly affected by the superstructure length and width. The results obtained by Reynolds-averaged Navier-Stokes method were also compared well with both the time averaged Improved Delayed Detached-Eddy Simulation results and the experimental data. In addition, by varying the model size and inflow velocity, various flow fields were numerically studied, which indicated that the changing of Reynolds number has tiny effect on the variation of the dimensionless size of the recirculation zone. The results in this study have certain reference value for the design of the frigate superstructure.

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