Turbulence Compressibility Effects for Supersonic and Hypersonic Separated Flows

2017 ◽  
pp. 263-267 ◽  
Author(s):  
S. Seror ◽  
L. Kosarev
Keyword(s):  
Separated Flows ◽  
Compressibility Effects

Computing Separated Flows in MEMS Devices

2002 ◽  
Author(s):  
Oktay Baysal ◽  
Alim Rustem Aslan
Keyword(s):  
Temperature Jump ◽  
Slip Flow ◽  
Fluid Flows ◽  
Synthetic Jets ◽  
Separated Flows ◽  
Navier Stokes ◽  
Mems Devices ◽  
Micro Channels ◽  
Analytical Formulae ◽  
Compressibility Effects

Fluid flows in micro devices span the entire Knudsen (Kn) number regime. Depending on the Kn range, a full continuum or a full free-molecular analysis may be applicable. In the present study, flows in the Kn range of 10−3 to 10−1 are considered and they are modeled using a conventional Navier-Stokes solver. Its boundary conditions, however, have been modified to account for the slip velocity and the temperature jump conditions encountered in these micro-sized geometries. The computations have been performed for straight micro channels, a micro backward facing step, and a micro filter. The present results are then compared with analytical formulae and other computations available in the literature. The results indicate that the rarefaction and compressibility effects present in these micro devices have been accurately predicted. In the case of slip flow, the separation is found to occur at a higher Reynolds number compared to the corresponding no-slip flow case. As the next step of the study, micro synthetic jets will be computed and the optimal cavity actuator geometries will be sought for desired flow deflections.

Adaptive control of separated flows

2003 ◽  
Author(s):  
M. Garwon ◽  
L. H. Darmadi ◽  
F. Urzynicok ◽  
G. Barwolff ◽  
R. King
Keyword(s):  
Adaptive Control ◽  
Separated Flows

Closed-Loop Control of Vortex Formation in Separated Flows with Application to Micro Air Vehicles

2010 ◽  
Author(s):  
Tim Colonius ◽  
Morteza Gharib ◽  
Clarence W. Rowley ◽  
Gilead Tadmor ◽  
David R. Williams
Keyword(s):  
Closed Loop ◽  
Vortex Formation ◽  
Micro Air Vehicles ◽  
Separated Flows ◽  
Closed Loop Control ◽  
Loop Control ◽  
Air Vehicles

scholarly journals Assessing IDDES-Based Wall-Modeled Large-Eddy Simulation (WMLES) for Separated Flows with Heat Transfer

Fluids ◽  
2021 ◽  
Vol 6 (7) ◽  
pp. 246
Author(s):  
Rozie Zangeneh
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Large Eddy Simulation ◽  
Skin Friction ◽  
Heat Fluxes ◽  
Separated Flows ◽  
Detached Eddy Simulation ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Isothermal Wall

The Wall-modeled Large-eddy Simulation (WMLES) methods are commonly accompanied with an underprediction of the skin friction and a deviation of the velocity profile. The widely-used Improved Delayed Detached Eddy Simulation (IDDES) method is suggested to improve the prediction of the mean skin friction when it acts as WMLES, as claimed by the original authors. However, the model tested only on flow configurations with no heat transfer. This study takes a systematic approach to assess the performance of the IDDES model for separated flows with heat transfer. Separated flows on an isothermal wall and walls with mild and intense heat fluxes are considered. For the case of the wall with heat flux, the skin friction and Stanton number are underpredicted by the IDDES model however, the underprediction is less significant for the isothermal wall case. The simulations of the cases with intense wall heat transfer reveal an interesting dependence on the heat flux level supplied; as the heat flux increases, the IDDES model declines to predict the accurate skin friction.

scholarly journals Data-assimilated low-order vortex modeling of separated flows

2018 ◽  
Vol 3 (12) ◽  
Author(s):  
Darwin Darakananda ◽  
André Fernando de Castro da Silva ◽  
Tim Colonius ◽  
Jeff D. Eldredge
Keyword(s):  
Separated Flows ◽  
Low Order

Genuine compressibility effects in wall-bounded turbulence

2019 ◽  
Vol 4 (12) ◽  
Author(s):  
Ming Yu ◽  
Chun-Xiao Xu ◽  
Sergio Pirozzoli
Keyword(s):  
Compressibility Effects ◽  
Wall Bounded Turbulence
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