LIF Visualization of a Supersonic Deep-Cavity Flow

2015 ◽  
pp. 435-440
Author(s):  
T. Handa ◽  
D. Ono
Keyword(s):  
Cavity Flow ◽  
Deep Cavity

Deep cavity flow mechanism of pipe penetration in clay

2012 ◽  
Vol 49 (1) ◽  
pp. 59-69 ◽  
Author(s):  
Kee Kiat Tho ◽  
Chun Fai Leung ◽  
Yean Khow Chow ◽  
Andrew Clennel Palmer
Keyword(s):  
Failure Mechanism ◽  
Practical Importance ◽  
Data Interpretation ◽  
Cavity Flow ◽  
Flow Mechanism ◽  
Deep Cavity ◽  
Wide Range ◽  
Smooth Pipe ◽  
Bearing Capacity Factor ◽  
Combination Of Material

The evolution of penetration resistance as a function of penetration depth of a pipe into a cohesive seabed is of practical importance, particularly in the areas of pipeline on-bottom stability assessment and T-bar penetrometer data interpretation. In the past, this subject was addressed primarily in a discontinuous manner by separating the penetration response into two broad regimes of shallow and deep penetrations followed by deriving plasticity solutions assuming a simplified “wished-in-place” configuration. In this manner, the effects of evolving seabed topology and the progressive transition from a shallow failure mechanism to a deep failure mechanism are neglected. This paper aims to provide greater insights into the transition zone, which is especially important for the interpretation of T-bar test data at shallow depths. In this study, the penetration response of a smooth pipe over a wide range of normalized clay strengths is numerically simulated. A deep cavity flow mechanism where the bearing capacity factor is 12% less than the conventional full-flow mechanism is identified and found to be operative up to a depth of 10 pipe diameters under a certain combination of material properties. An analysis method is proposed to predict the load–penetration response for a given set of clay strengths and pipe diameters.

129 Incompressible numerical simulation of a deep cavity flow using an acoustic resonance model

2016 ◽  
Vol 2016.51 (0) ◽  
pp. 55-56
Author(s):  
Shiku HIRAI ◽  
Yu NISHIO ◽  
Seiichiro IZAWA ◽  
Yu FUKUNISHI
Keyword(s):  
Numerical Simulation ◽  
Acoustic Resonance ◽  
Cavity Flow ◽  
Resonance Model ◽  
Deep Cavity

Numerical Simulation of Incompressible Laminar Flow over Three-Dimensional Rectangular Cavities

2004 ◽  
Vol 126 (6) ◽  
pp. 919-927 ◽  
Author(s):  
H. Yao ◽  
R. K. Cooper ◽  
S. Raghunathan
Keyword(s):  
Reynolds Number ◽  
Incompressible Flow ◽  
Three Dimensional ◽  
Reynolds Numbers ◽  
Cavity Flow ◽  
External Flow ◽  
Cavity Flows ◽  
Recirculating Flow ◽  
Deep Cavity ◽  
Shallow Cavity

This paper presents results of investigations of unsteady incompressible flow past three-dimensional cavities, where there is a complex interaction between the external flow and the recirculating flow inside the cavity. A computational fluid dynamics approach is used in the study. The simulation is based on the solution of the unsteady Navier-Stokes equations for three-dimensional incompressible flow by using finite difference schemes. The cavity is assumed to be rectangular in geometry, and the flow is assumed to be laminar. Typical results of computation are presented, showing the effects of the Reynolds number, cavity geometry, and inflow condition on the cavity flow fields. The results show that high Reynolds numbers, with deep cavity and shallow cavity flows can become unsteady with Kelvin-Helmholtz instability oscillations and exhibiting a three-dimensional nature, with Taylor-Go¨rtler longitudinal vortices on the floor and longitudinal vortex structures on the shear layer. At moderate Reynolds numbers the shallow cavity flow is more stable than deep cavity flows. For a given Reynolds number the flow structure is affected by the thickness of the inflow boundary layer with a significant interaction between the external flow and the recirculating flow inside the cavity.

Experimental study of shear-layer/acoustics coupling in Mach 5 cavity flow

AIAA Journal ◽  
2001 ◽  
Vol 39 ◽  
pp. 242-252
Author(s):  
O. H. Unalmis ◽  
N. T. Clemens ◽  
D. S. Dolling
Keyword(s):  
Experimental Study ◽  
Shear Layer ◽  
Cavity Flow

scholarly journals Large-eddy simulation of wall-bounded turbulent flow with high-order discrete unified gas-kinetic scheme

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
Rui Zhang ◽  
Chengwen Zhong ◽  
Sha Liu ◽  
Congshan Zhuo
Keyword(s):  
Turbulent Flow ◽  
Turbulent Flows ◽  
Parallel Implementation ◽  
Kinetic Scheme ◽  
Cavity Flow ◽  
Equilibrium Distribution Function ◽  
Third Order ◽  
Two Stage ◽  
Large Eddy ◽  
Unified Gas Kinetic Scheme

AbstractIn this paper, we introduce the discrete Maxwellian equilibrium distribution function for incompressible flow and force term into the two-stage third-order Discrete Unified Gas-Kinetic Scheme (DUGKS) for simulating low-speed turbulent flows. The Wall-Adapting Local Eddy-viscosity (WALE) and Vreman sub-grid models for Large-Eddy Simulations (LES) of turbulent flows are coupled within the present framework. Meanwhile, the implicit LES are also presented to verify the effect of LES models. A parallel implementation strategy for the present framework is developed, and three canonical wall-bounded turbulent flow cases are investigated, including the fully developed turbulent channel flow at a friction Reynolds number (Re) about 180, the turbulent plane Couette flow at a friction Re number about 93 and lid-driven cubical cavity flow at a Re number of 12000. The turbulence statistics, including mean velocity, the r.m.s. fluctuations velocity, Reynolds stress, etc. are computed by the present approach. Their predictions match precisely with each other, and they are both in reasonable agreement with the benchmark data of DNS. Especially, the predicted flow physics of three-dimensional lid-driven cavity flow are consistent with the description from abundant literature. The present numerical results verify that the present two-stage third-order DUGKS-based LES method is capable for simulating inhomogeneous wall-bounded turbulent flows and getting reliable results with relatively coarse grids.

Compressible subsonic cavity flow in a nozzle

2021 ◽  
Vol 62 (1) ◽  
pp. 011505
Author(s):  
Xiaohui Wang
Keyword(s):  
Cavity Flow
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