Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 23 for “"lid-driven cavity"”.
-
Simulation of steady mixed convection in a lid-driven cavity filled with newtonian fluid by finite volume method
The steady mixed convection flow in a lid-driven cavity was simulated. The cavity was filled with a Newtonian fluid, both vertical walls are adiabatic, while the horizontal walls were either fixed cold and uniformly/oscillatory heated. Firstly, the effect of internal heat generation or absorption …
-
Nodal Methods for Problems in Fluid Mechanics and Neutron Transport (navier-Stokes Equation, Boussinesq, Lid-Driven Cavity, Natural Thermal Convection, Diffusion Synthetic Acceleration)
A new high-accuracy, coarse-mesh, nodal integral approach is developed for the efficient numerical solution of linear partial differential equations. It is shown that various special cases of this general nodal integral approach correspond to several high-efficiency nodal methods developed recently …
-
A Modified Nodal Integral Method for the Time -Dependent, Incompressible Navier -Stokes Equations and Its Parallel Implementation
… for up to four processors for the modified lid driven cavity problem with exact solution.
-
Multigrid solutions of elliptic fluid flow problems
… classical two-dimensional problem of flow in a lid-driven cavity is investigated in depth for flows at Reynolds numbers of 100,400 and 1000. This gives an extremely good indication of the power of a multigrid approach. Next, the solution methodology is applied to flow in a three-dimensional …
-
Topological Chaos and Mixing in Lid-Driven Cavities and Rectangular Channels
… is theoretically and numerically investigated in lid-driven cavities and rectangular channels without internal rods. When a two-dimensional incompressible Newtonian flow is in the Stokes flow regime, the stream function satisfies the two-dimensional biharmonic equation. When the flow occurs in a …
-
An Approximation for the Twenty-One-Moment Maximum-Entropy Model of Rarefied Gas Dynamics
… the Navier-Stokes equations lose physical validity due to the solution being too far from local equilibrium. Furthermore, its first-order hyperbolic nature offers the potential for improved numerical accuracy as well as a decreased sensitivity to mesh quality. Unfortunately, higher-order …
-
On the boundary conditions for dissipative particle dynamics (DPD)
… boundary. Two test cases of Couette flow and lid driven cavity have been done to show that DPD can be used successfully to validate the results. In order to simulate flows where periodic boundary condition cannot be applied, a source-sink method is employed in which the particles are injected …
-
Development of an efficient finite volume computational platform for the simulation of complex flows of complex fluids governed by the Rolie-Poly model
… presented in this thesis. The test cases of the lid-driven cavity flow and the planar 4:1 contraction flow were used to validate the solver which was used with the OpenFOAM CFD package. Discrete Elastic Viscous Stress Splitting (DEVSS) technique and the Log-conformation Reformulation (LCR) …
-
A finite volume discretization method for flow on structured and unstructured anisotropic meshes
… The 2D case involved incompressible ow in a lid-driven cavity. Anisotropic structured and unstructured meshes were employed. Significant improvements in accuracy were found with the ET schemes, with average reductions in error measuring up to a 50%. In comparison to existing methods, it is …
-
Vertex-based discretisation methods for thermo-fluid flow in a finite volume-unstructured mesh context
… a vertex-based discretisation technique for solid mechanics problems. The vertex-based discretisation approach is validated for a variety of heat transfer problems and comparisons are made with cell-centred solutions. A coupled thermo-mechanical problem, including solidification and radiation, …
-
Continuum Sensitivity Analysis using Boundary Velocity Formulation for Shape Derivatives
… code). Examples of a NACA0012 airfoil and a lid-driven cavity highlight the effect of the accuracy of the sensitivity boundary conditions on the flow derivatives. It is shown that the spatial gradients of flow velocities, calculated using SGR, contribute significantly to the sensitivity …
-
High performance simulations of yield stress fluids in a structured adaptive mesh refinement framework with embedded boundaries
… demonstrated by novel numerical experiments in a lid-driven cavity. In order to investigate flows in more interesting domain geometries and around objects, an embedded boundary algorithm has been developed which works alongside the viscoplastic flow solver. We show how this methodology can be …
-
High performance computing for multiphase fluid flows
… without an obstacle, rising of an air bubble and lid driven cavity flows. Speedup data from parallel programs implemented on these problems are generated.
-
Modified nodal integral method for Navier-Stokes equations incorporated with generic quadrilateral elements, and GPU-based parallel computing
… equations into a set of transformed equations valid over the transformed computational domain. Then the new nodal scheme is formulated for the transformed equations. The numerical scheme developed is applied to several test problems of increasing complexity. Results show that the scheme works …
-
Gravity-driven continuous thin film flow over topography
… systematic theoretical investigation of gravity-driven thin film flow over various topographical features, the effect of inertia being of particular interest. The problem is solved using a hierarchy of models based, in order of decreasing complexity, on (i) the full Navier-Stokes system of …
-
High order stochastic transport and Lagrangian data assimilation
… stochastic flow past a cylinder, and stochastic lid-driven cavity flow. We show that our schemes improve the consistency between reconstructed DO realizations and the corresponding MC realizations, and that we achieve the expected order of accuracy. In the second part of the work, we first …
-
Evaluating the OpenACC API for Parallelization of CFD Applications
… execution time for a standard benchmark case (lid-driven cavity) is used as a reference. The OpenACC version is compared against the identical Fortran code recompiled to use OpenMP on multicore CPUs, as well as a highly-optimized C++ version of the code that utilizes hardware aware programming …
-
Meshless Direct Numerical Simulation of Turbulent Incompressible Flows
… and all formulations use a reduced set, valid for parabolic flows only. For example, for segregated methods, boundary condition of normal derivative for pressure zero is valid only in parabolic flows. Additionally, the complete proposal for mass balance correction is right exclusively for …
-
Multi-level Parallelism with MPI and OpenACC for CFD Applications
… study, a CFD code that solves incompressible cavity flows is accelerated using OpenACC. Overlapping communication with computation improves performance for the multi-GPU implementation by up to 21%, achieving up to 400 times faster performance than a single CPU and 99% weak scalability …
-
Computations of bubble dynamics with heat transfer
… solar collectors to nuclear reactors. A bubble sliding over a heated obstacle increases heat transfer by displacing liquid, particularly in the wake region behind the bubble. This, in turn, increases heat transfer from the hot surface, by continuously bringing cooler liquid into contact with the …
Page 1 of 2