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  • 1
    Electronic Resource
    Electronic Resource
    Numerical simulation of turbulent flow over a moving wavy boundary: Norris and Reynolds extended (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 6 (1994), S. 924-943 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A numerical model of fully developed turbulent channel flow over a moving wavy boundary is presented. The model is of the linear-stability type, employs a transformed coordinate system, and uses the finite difference method for solution. Both the time-independent mean flow and the time-dependent perturbation to the mean flow caused by the traveling wavy boundary are computed. A low-turbulence-Reynolds-number form of the k-epsilon turbulence closure model is employed and three levels of sophistication in modeling the wave-induced Reynolds stresses (in the transformed coordinate system) are introduced. These models are the viscous quasilaminar (VQL) model, the mean eddy viscosity (EV) model, and the full perturbation (FP) model. The model is applied to simulate previous experimental investigations of the flow over wavy boundaries (including a water wave) under a variety of conditions. The solutions generated using both the EV and FP Reynolds stress closure models generally demonstrate very good agreement with the available pressure, stress, velocity, and Reynolds stress experimental data. In contrast, due to its neglect of the perturbation Reynolds stresses, the simple VQL closure model has limited predictive ability, especially for downstream running waves whose wave speed exceeds about half the channel centerline velocity and for cases with low inverse Reynolds numbers (based on the shear velocity and wavelength). For the water wave case, the component of the wave growth rate due to the pressure mechanism predicted by the EV and FP models can be up to three times those of the VQL model in the gravity wave growth range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.868326
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Flow visualization of a recirculating flow by rheoscopic liquid and liquid crystal techniques (1984)
    Springer
    Experiments in fluids 2 (1984), S. 57-64 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Experiments were conducted in a three-dimensional lid-driven cavity flow to study the behavior of longitudinal Taylor-Görtler-like vortices. Flow visualization was accomplished by use of a rheoscopic liquid and of liquid crystals, together with laser-light and white-light sheets, respectively. Photographs of the lighted planes in the flow confirmed the existence of the vortices for a wide range of Reynolds numbers and for stable, neutrally-buoyant and buoyant global flow conditions. As usual the flow visualization revealed flow patterns not deducible by in situ measurements; the liquid crystal photographs give both flow pathlines and temperature distribution on any lighted plane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00261322
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Tandem interference effects of supercavitating struts (1965)
    Springer
    Archive of applied mechanics 34 (1965), S. 216-227 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00534857
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A coupled multigrid-domain-splitting technique for simulating incompressible flows in geometrically complex domains (1991)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 13 (1991), S. 269-286 
    Details
    ISSN: 0271-2091
    Keywords: Unsteady ; Navier-Stokes ; Domain decomposition ; Schwarz ; QUICK ; Multigrid ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper describes a domain decomposition numerical procedure for solving the Navier-Stokes equations in regions with complex geometries. The numerical method includes a modified version of QUICK (quadratic upstream interpolation convective kinematics) for the formulation of convective terms and a central difference scheme for the diffusion terms. A second-order-accurate predictor-corrector scheme is employed for the explicit time stepping. Although the momentum equations are solved independently on each subdomain, the pressure field is computed simultaneously on the entire flow field. A multigrid technique coupled with a Schwarz-like iteration method is devised to solve the pressure equation over the composite domains. The success of this strategy depends crucially on appropriate methods for specifying intergrid pressure boundary conditions on subdomains. A proper method for exchanging information among subdomains during the Schwarz sweep is equally important to the success of the multigrid solution for the overall pressure field. These methods are described and subsequently applied to two forced convection flow problems involving complex geometries to demonstrate the power and versatility of the technique. The resulting pressure and velocity fields exhibit excellent global consistency. The ability to simulate complex flow fields with this method provides a powerful tool for analysis and prediction of mixing and transport phenomenon.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650130302
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    A composite multigrid method for calculating unsteady incompressible flows in geometrically complex domains (1995)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 20 (1995), S. 341-361 
    Details
    ISSN: 0271-2091
    Keywords: Navier-Stokes ; unsteady ; composite multigrid ; incompressible ; non-staggered grid ; semi-implicit ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A time-accurate, finite volume method for solving the three-dimensional, incompressible Navier-Stokes equations on a composite grid with arbitrary subgrid overlapping is presented. The governing equations are written in a non-orthogonal curvilinear co-ordinate system and are discretized on a non-staggered grid. A semi-implicit, fractional step method with approximate factorization is employed for time advancement. Multigrid combined with intergrid iteration is used to solve the pressure Poisson equation. Inter-grid communication is facilitated by an iterative boundary velocity scheme which ensures that the governing equations are well-posed on each subdomain. Mass conservation on each subdomain is preserved by using a mass imbalance correction scheme which is secondorder-accurate. Three test cases are used to demonstrate the method's consistency, accuracy and efficiency.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650200502
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    Paper (German National Licenses)
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