Three-Dimensional Time-Averaged Flow Fields in the Turbulent Wake of a Surface-Mounted Finite-Height Square Prism

2018 ◽  
pp. 149-154
Author(s):  
R. Chakravarty ◽  
N. Moazamigoodarzi ◽  
D. J. Bergstrom ◽  
D. Sumner
Keyword(s):  
Three Dimensional ◽  
Flow Fields ◽  
Turbulent Wake ◽  
Square Prism ◽  
Finite Height

Real gas flow fields about three dimensional configurations

1983 ◽  
Author(s):  
A. BALAKRISHNAN ◽  
C. LOMBARD ◽  
W.C. DAVY
Keyword(s):  
Gas Flow ◽  
Three Dimensional ◽  
Flow Fields ◽  
Real Gas

Manipulation of three-dimensional asymmetries of a turbulent wake for drag reduction

2021 ◽  
Vol 912 ◽  
Author(s):  
Yann Haffner ◽  
Thomas Castelain ◽  
Jacques Borée ◽  
Andreas Spohn
Keyword(s):  
Drag Reduction ◽  
Three Dimensional ◽  
Turbulent Wake

Abstract

scholarly journals Statistics of highly heterogeneous flow fields confined to three-dimensional random porous media

2016 ◽  
Vol 93 (1) ◽  
Author(s):  
C. Jin ◽  
P. A. Langston ◽  
G. E. Pavlovskaya ◽  
M. R. Hall ◽  
S. P. Rigby
Keyword(s):  
Porous Media ◽  
Three Dimensional ◽  
Flow Fields ◽  
Heterogeneous Flow ◽  
Random Porous Media

Dynamic flow structures in the wake of a surface-mounted finite-height square prism

2020 ◽  
Author(s):  
Bárbara Louize da Silva ◽  
David Sumner ◽  
Donald Bergstrom
Keyword(s):  
Flow Structures ◽  
Dynamic Flow ◽  
Square Prism ◽  
Finite Height

A Numerical Investigation of the Effect of Inlet Preswirl Ratio on Rotordynamic Characteristics of Labyrinth Seal

2017 ◽  
Author(s):  
Tomohiko Tsukuda ◽  
Toshio Hirano ◽  
Cori Watson ◽  
Neal R. Morgan ◽  
Brian K. Weaver ◽  
...  
Keyword(s):  
Flow Model ◽  
Three Dimensional ◽  
Axial Direction ◽  
Labyrinth Seal ◽  
Flow Fields ◽  
Bulk Flow ◽  
The Other ◽  
Circumferential Velocity ◽  
Stiffness Coefficients ◽  
Inlet Swirl

Full three-dimensional CFD simulations are carried out using ANSYS CFX to obtain the detailed flow field and to estimate the rotordynamic coefficients of a labyrinth seal for various inlet swirl ratios. Flow fields in the labyrinth seal with the eccentricity of the rotor are observed in detail and the detailed mechanisms that increase the destabilizing forces at high inlet swirl ratios are discussed based on the fluid governing equations associated with the flow fields. By evaluating the contributions from each term of the governing equation to cross coupled force, it is found that circumferential velocity and circumferential distribution of axial mass flow rate play key roles in generating cross coupled forces. In the case that circumferential velocity is high and decreases along the axial direction, all contributions from each term are positive cross coupled force. On the other hand, in the case that circumferential velocity is low and increases along the axial direction, one contribution is positive but the other is negative. Therefore, cross coupled force can be negative in the local chamber depending on the balance even if circumferential velocity is positive. CFD predictions of cross coupled stiffness coefficients and direct damping coefficients show better agreement with experimental results than a bulk flow model does by considering the force on the rotor in the inlet region. Cross coupled stiffness coefficients derived from the force on the rotor in the seal section agree well with those of the bulk flow model.

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