Numerical study of ignition within hydrogen-air supersonic boundary layers

AIAA Journal ◽  
1993 ◽  
Vol 31 (5) ◽  
pp. 884-890 ◽  
Author(s):  
Luis Fernando Figueira da Silva ◽  
Bruno Deshaies ◽  
Michel Champion
Keyword(s):  
Boundary Layers ◽  
Numerical Study

scholarly journals Development of Depth-Limited Wave Boundary Layers over a Smooth Bottom

2020 ◽  
Vol 9 (1) ◽  
pp. 27
Author(s):  
Hitoshi Tanaka ◽  
Nguyen Xuan Tinh ◽  
Xiping Yu ◽  
Guangwei Liu
Keyword(s):  
Numerical Simulation ◽  
Boundary Layer ◽  
Boundary Layers ◽  
Wave Motion ◽  
Numerical Study ◽  
Experiment Data ◽  
Tidal Motion ◽  
Long Period ◽  
Simulation Results ◽  
Wave Boundary

A theoretical and numerical study is carried out to investigate the transformation of the wave boundary layer from non-depth-limited (wave-like boundary layer) to depth-limited one (current-like boundary layer) over a smooth bottom. A long period of wave motion is not sufficient to induce depth-limited properties, although it has simply been assumed in various situations under long waves, such as tsunami and tidal currents. Four criteria are obtained theoretically for recognizing the inception of the depth-limited condition under waves. To validate the theoretical criteria, numerical simulation results using a turbulence model as well as laboratory experiment data are employed. In addition, typical field situations induced by tidal motion and tsunami are discussed to show the usefulness of the proposed criteria.

A Multigrid Accelerated Code for Simulating Unsteady Conjugate Natural Convection Boundary Layers

2016 ◽  
Vol 846 ◽  
pp. 30-35
Author(s):  
Mehdi Khatamifar ◽  
Emma Lee Wood ◽  
Wen Xian Lin ◽  
David Holmes ◽  
Steven W. Armfield ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Boundary Layers ◽  
Numerical Study ◽  
Viscous Boundary Layer ◽  
Central Difference ◽  
Simulation Accuracy ◽  
Conjugate Natural Convection ◽  
Wide Range ◽  
Convection Boundary

This paper presents a numerical study on the flow dynamics and heat transfer behaviour of unsteady conjugate natural convection boundary layers (CNCBLs) in a partitioned, air filled square cavity. An unsteady two-dimensional multigrid-assisted solver is developed in the C#.NET programming language on stretched Cartesian meshes. The finite volume method is used to discretise the governing equations. To solve the coupled pressure and velocity, the SIMPLE algorithm is used, and to increase simulation accuracy the Adam-Bashforth, QUICK and central difference schemes are employed for time, convection, and diffusion terms respectively. The Poisson pressure equation is solved through the use of the multigrid method. The developed code is used to model CNCBLs which typically require a large amount of simulation time. The numerical results provide detailed descriptions of unsteady CNCBLs and associated heat transfer behaviour over a wide range of Ra, such as the thermal and viscous boundary layer thicknesses, temperature and velocity distributions, and maximum velocities within the CNCBLs.

Numerical study of separated laminar boundary layers over multiple sine-wave protuberances

1976 ◽  
Vol 13 (3) ◽  
pp. 168-173 ◽  
Author(s):  
A. Polak ◽  
M. J. Werle ◽  
V. N. Vatsa ◽  
S. D. Bertke
Keyword(s):  
Boundary Layers ◽  
Numerical Study ◽  
Sine Wave ◽  
Laminar Boundary Layers
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