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Showing 1 to 20 of 57 for “"incompressible flow"”.
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Incompressible flow over a three-dimensional cavity
… fluid dynamics (CFD) method, the physics of incompressible flow passing over a three-dimensional cavity on a solid surface. This study has been divided into two parts: 1) incompressible laminar flow passing over a three-dimensional cavity; and 2) incompressible laminar-to-turbulent transition …
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Incompressible Flow Past Wedges at High Reynolds Numbers
Made available in DSpace on 2014-12-13T19:55:26Z (GMT). No. of bitstreams: 1 7726775.pdf: 3370976 bytes, checksum: 9309341f2aec6da3c58b32911182af2d (MD5) Previous issue date: 1977
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Continuum Sensitivity Analysis for Shape Optimization in Incompressible Flow Problems
… for shape optimization. The open-source Incompressible Flow Iterative Solution Software (IFISS) mixed finite element method toolbox for MATLAB developed by Silvester, Elman, and Ramage is used. Meshes are produced for a backward-facing step problem, using built-in tools from IFISS as well …
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A Continuous/Discontinuous FE Method for the 3D Incompressible Flow Equations
… scheme for the numerical solution of the incompressible Navier-Strokes equation is presented. Finite element discontinuous Galerkin (dG) discretization for the velocity in the momentum equations is employed. The incompressibility constraint is enforced by numerically solving the Poisson …
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A computational and experimental investigation of the propulsive and lifting characteristics of oscillating airfoils and airfoil combinations in incompressible flow
… gradient of a stationary airfoil. Finally, flow visualization experiments were conducted using a low smoke speed tunnel at the Naval Postgraduate School (NPS). This experiment demonstrated the effects of a thrust producing, oscillating airfoil on the formation of the wake vortices. …
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A new method for calculating the flow field in a dump combustor
An elliptic/parabolic procedure for solving the flow field in a dump combustor is described. The elliptic calculation is used at the dump combustor entrance and a parabolic calculation downstream. The calculations are restricted to steady axisymmetric nonreactive incompressible flow. A great …
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Theoretical Analysis of Transpiration Cooling of a Liquid Rocket Thrust Chamber Wall
… computer codes were developed for simulating the flow of a coolant and the transport phenomena in a transpiration cooled thrust chamber wall of a liquid rocket engine by treating the coolant in two ways: as an incompressible fluid and as a compressible fluid in local thermal equilibrium with the …
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The Tollmien-Schlichting instability of laminar viscous flows
… instability of laminar viscous flows is presented. For two-dimensional incompressible flow past a flat plate with porous suction strips, we use linear triple-deck, closed-form solutions for the mean flow to do a linear, parallel, spatial stability analysis. We develop a simple …
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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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A Study of the Volume of Fluid Method for Moving Boundary Problems
… the Continuum surface force model. The governing flow equations for Newtonian fluids in incompressible flow in two dimensions are solved using the pressure-based algorithm. A linear interface reconstruction algorithm is developed and improved by interpolations. In order to validate the code, the …
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Numerical method for solving fluid flow and heat transfer equations by design optimization
A numerical procedure for solving fluid flow and heat transfer equations by design optimization is presented. The procedure uses an optimization program based on an exterior penalty function method to solve the partial differential equations. The intent of the investigation is to show that the …
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Aerodynamic design of annular ducts
… having geometries capable of supporting fluid flows with prescribed performance characteristics. Three basic numerical methods of solution are given and are used to obtain results to the known exact solutions for a class of axisymmetric, irrotational incompressible flow regimes. Examination is …
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Nonlinear steady and unsteady aerodynamics of wings and wing-body-combinations
… for the nonlinear three-dimensional unsteady incompressible flow over delta wings. Symmetric motions (pitching, heaving) and asymmetric motions (roll, yaw) are considered. Then the method is generalized to treat the nonlinear three-dimensional steady flow for bodies and wing body combinations. …
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Actuator Disk Theory for Compressible Flow
… was established for compressible, subsonic flow using the three laws of conservation and isentropic thermodynamics. The compressible Actuator Disk Theory was established for the unducted (bare) and ducted cases in which the disk was treated as the only assembly within the flow stream in the …
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Smoothed particle hydrodynamics
… a null divergence velocity field using SPH for incompressible flow - a pure SPH solution of the Helmholtz-Hodge decomposition. Also, a new version of the Laplacian for SPH is proposed and the advantages and disadvantages of different gradient and Laplacian approximation formulas used in SPH are …
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Numeriese model van vloei deur 'n vastebedvergasser
… at its optimum and most stable condition. The flow of gas in the reactor has a direct influence on the stability of the gasifier. A technique to measure the flow in the reactor does not exist. In this study the cold, incompressible flow in the gasifier is studied. This was done by solving the …
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Study of flow past elliptic and circular cylinders using direct numerical simulation
Flow over elliptic cylinders can be considered prototypical of flow over a range of bluff bodies since the geometry allows one to study the effect of both thickness and angle-of-attack on the flow field. Therefore a careful study of this flow should provide valuable insight into the phenomenon of …
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A finite difference solution to the two-dimensional wall jet on a combustion turbine blade
… for steady, two-dimensional, homogeneous, incompressible flow are solved using an implicit finite difference technique. Calculations are performed for laminar and turbulent boundary layer flows with and without tangential jet injection. Results from the finite difference calculation for the …
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Adjoint-based optimization for inkjet printing
In this thesis the flow inside inkjet printhead microchannels is analysed using a two- parameter low Mach number expansion of the compressible Navier–Stokes equations and a reduced order model for the free surface flow inside the inkjet nozzle. The channel flow is separated into equations for an …
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