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Showing 1 to 20 of 30 for “"cavity flow"”.
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Unsteady Viscous Cavity Flow Using Computational Fluid Dynamics
<p>The problem of unsteady viscous incompressible flow in a two-dimensional cavity is treated using the unsteady incompressible Navier-Stokes equations with various initial and boundary conditions. First the case of a square cavity with one inlet and one outlet is treated in steady and unsteady …
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Cavity flow past an obstacle including gravity effects
… the relaxation method to find the solution of cavity flow past a two-dimensional roughness element in an open channel with gravity effect included. The method developed is based on an inviscid, irrotational and incompressible flowfield, using a finite-difference representation with stream …
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A numerical investigation of self-sustained cavity flow oscillations
Two-dimensional (2-D) cavity flow physics and oscillation control were investigated through solutions of the Reynolds-Averaged Navier-Stokes equations coupled with a two-equation k-? turbulence model. Effects of the leading edge modifications including compression ramps, expansion surfaces and mass …
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Effects of axial turbine tip shroud cavity flow on performance and durability
Flow through tip shroud cavity in a representative axial turbine vane-rotor stage environment is assessed for its role in loss generation and turbine durability. Steady and unsteady three-dimensional flow computations, complemented by control volume analyses, for varying shroud configurations …
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An Experimental Study of Formation of Circulation Patterns in Laminar Unsteady Driven Cavity Flows Using Particle Image Velocimeter (PIV) Techniques
… the high laminar to transitional range. Driven Cavity Flow is a classic fluid dynamics case often used for benchmarking of computational codes. Previous work has primarily focused on improving computational codes, experimental work is lacking and focused on obtaining steady state readings. The …
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The large-eddy simulation of incompressible flows in simple and complex geometries
… the turbulent physics of an incompressible flow in simple and complex geometries. The Cartesian form of the governing equations was first verified, and then later used to investigate a three-dimensional shear-driven cavity flow. The investigation involved Reynolds numbers of 2000, 3200, 5000 …
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Efficient solutions of 2-D incompressible steady laminar separated flows
… two-dimensional incompressible laminar steady flows at moderate-to-high Reynolds numbers. The method uses an incremental multigrid method and an extrapolation procedure based on minimum residual concepts to accelerate the convergence rate of a robust block-line-Gauss-Seidel solver for the …
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Numerical representations of fluid mixing
… of both laminar and thermally driven types of cavity flow, together with an analysis of their associated mixing processes which find applications to Industrial mixing and also to the environment. The mixing efficiency has been viewed from two perspectives namely the tracking of a selection of …
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Sensitivity analysis and simulations of surface heating for hypersonic cavity flows
Hypersonic flow over cavities results in instabilities and discontinuities that affect the surface properties, and potentially results in surface damage. Simulations were performed using semi-structured 2D meshes in FUN3D with the Spalart-Allmaras and Menter Shear Stress Transport turbulence models …
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A Perfectly Matched Layer Method for the Navier-Stokes equations
… performance is assessed when applied to complex flows; in particular, a viscous cavity flow is investigated. Stabilizing adjustments to the method are made, and future work is indicated for increased utility and flexibility of the method.
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Numerical Simulations of Viscoelastic Flows Using the Discontinuous Galerkin Method
… develop a method for solving viscoelastic fluid flows using the Navier-Stokes equations coupled with the Oldroyd-B model. We solve the Navier-Stokes equations in skew-symmetric form using the mixed finite element method, and we solve the Oldroyd-B model using the discontinuous Galerkin method. …
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Cavity Flows Control by High Frequency Forcing
… has been recently discovered that exciting the flow at high frequencies it is possible to suppress or weaken the undesired effects in a wide range of flow conditions. Additionally, this forcing can be generated by a simple Von Karman wake. In this way both advantages, simplicity and a wide …
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Development of an efficient finite volume computational platform for the simulation of complex flows of complex fluids governed by the Rolie-Poly model
The flow of non-Newtonian fluids, also known as complex fluids, is an important area of fluid mechanics due to their applications in industries such as food processing, mining, chemical and plastic industries. It is therefore essential to understand the flow and general behaviour of such fluids. …
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The Stability Properties of Some Rheological Flows
The stability of wall driven and thermally driven cavity flow is investigated for a wide range of viscous and viscoelastic fluids. The effect of inertia, elasticity, temperature gradients, viscous heating and Biot boundary conditions are of particular interest. Both destabilisation and bifurcation …
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ILU and Machine Learning Based Preconditioning For The Discretized Incompressible Navier-Stokes Equations.
… experiments for model problems of a driven cavity flow, and flow over a backward-facing step illustrate the performance of one-parameter and two-parameter ILU factorizations as preconditioners. We also introduce a Machine Learning (ML) based approach for building ILU factorizations for …
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Experimental and analytical assessment of cavity modes in a gas turbine wheelspace
… Hot Gas Ingestion Rig shows the existence of cavity modes in the rim-seal-wheelspace cavity for representative turbine engine operating conditions with purge flow. The experimental results and observations are complemented by computational assessments of cavity modes associated with flow in …
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Computational assessment of turbine rim seal system parametric variation on hot gas ingestion and flow pattern
… (DOE) is carried out to assess the turbine rim cavity system parametric variation on hot gas ingestion, flow pattern, and turbine stage efficiency. The parameters focused on are purge to main mass flow rate ratio, axial gap to rim radius ratio, radial gap to rim radius ratio, normalized axial …
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Characterization of turbine rim seal flow and its sealing effectiveness
… turbine engine, ingestion of hot gas from the flowpath into the gaps between the turbine rotor and stator can lead to elevated metal temperatures and a deterioration of component life. To prevent ingestion, bleed air from the compressor is used to "purge" the rim seal cavities. Establishing a …
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Feedback control of oscillations in combustion and cavity flows
… resonance is then considered: the compressible flow past a shallow cavity. We start by finding a linear model of the cavity flow's dynamics, or its `transfer function', which we identify from direct numerical simulations. We compare this measured transfer function to that given by a conceptual …
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Least squares finite element methods for the Stokes and Navier-Stokes equations
… we compare numerical results for the driven cavity flow problem with some benchmark results reported in the literature.
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