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Showing 1 to 20 of 139 for “"Upwind"”.
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Covolume-Upwind Finite Volume Approximations For Linear Elliptic Partial Differential Equations
<p>In this dissertation we study covolume-upwind finite volume methods on rectilinear grids for solving second-order linear elliptic partial differential equations with mixed boundary conditions. This class of problems has intensive applications in various fields of science and engineering, e.g., …
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Development of an improved multi-dimensional upwind scheme for Euler/Navier-Stokes computations
Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:55:07Z Item is restricted indefinitely.
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Multi-dimensional Upwind Fluctuation Splitting Scheme with Mesh Adaption for Hypersonic Viscous Flow
A multi-dimensional upwind fluctuation splitting scheme is developed and implemented for two-dimensional and axisymmetric formulations of the Navier-Stokes equations on unstructured meshes. Key features of the scheme are the compact stencil, full upwinding, and non-linear discretization which allow …
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Viscous solutions for the Navier Stokes equations using an upwind finite volume technique
The process of enhancing an upwind finite volume, two-dimensional, thin layer Navier Stokes solver to achieve complete Navier Stokes solutions is described. The shear stress and heat flux contributions are identified and transformed to a generalized coordinate system. The metrics which result from …
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Two-dimensional Euler computations on a triangular mesh using an upwind, finite-volume scheme
… triangular meshes using a flux-difference split, upwind method. The procedure uses a dual mesh system to implement the finite-volume scheme using conserved variables stored at the vertices of the triangles. The vertices of the triangles are located approximately in the center of the dual mesh …
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Boundary layer temporal evolution observed by doppler lidar upwind of a lake-effect snow event
… of the atmospheric boundary layer on the lake’s upwind shore, and investigate its influence on the larger lake-effect snow process. The analysis of the data retrieved by the LiDAR, in conjunction with supporting datasets, will be focused on 8 to 9 December 2016 at locations surrounding Lake …
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A Streamline Upwind/ Petrov-Galerkin FEM based time-accurate solution of 3D time-domain Maxwell's equations for dispersive materials
… for dispersive materials in a Streamline Upwind/Petrov-Galerkin framework is investigated. For this purpose the permittivity associated with a material is expressed as a matrix, enabling the solution of anisotropic material models with multiple poles. Here diagonally isotropic models with …
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Higher order numerical schemes for propagation of wind wave spectra
… used in these models, typically the 1st order upwind scheme, encounter difficulty arising from the poor directional resolution (typically 30 degrees) in regions of varying depth and current where wave energy is refracted and concentrated into a small number of directional bins. Since the widely …
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Multidimensional dynamic compression system modeling
… by modeling the governing equations with upwind differencing and use of implicit time integration. A special form of upwind flux, flux difference splitting with source term treatment, FDSS, was developed for the model. A two-dimensional axisymmetric model was developed to allow post-stall …
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DGM-FD: A Finite Difference Scheme Based on the Discontinuous Galerkin Method
… scheme has a shortened stencil. Fourth-order upwind and third order central schemes are presented as examples of the first grid structure. Fifth-order upwind schemes are derived for the second structure. For non-linear equations, flux finite difference formula are given where no explicit …
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The olfactory basis for attraction of the Bollworm helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae) to host-plant flowers
… and benzyl alcohol. Increases in upwind flight to air entrained extracts of floral odours indicated that these cues caused attraction when presented to female H. armigera. A synthetic T. erecta blend comprising benzaldehyde, (f)- linalool, phenylacetaldehyde and (+)-limonene gave …
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Outdoor wind speed enhancement in residential precincts in tropical cities
… void decks. The first precinct with smooth upwind areas shows significant wind speed enhancement up to 80% of the freestream wind speed (the wind speed above the roof level) with void decks. The second precinct with rough upwind areas shows wind speed enhancement up to 50% of the freestream …
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Some theoretical aspects of fibre suspension flows
… flows, with the use of the Streamline Upwind (SU) method, and the Streamline upwind Petrov/Galerkin (SUPG) method.
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Kinetic algorithms for non-equilibrium gas dynamics
New upwind kinetic-difference schemes have been developed for flows with nonequilibrium thermodynamics and chemistry. These schemes are derived from the Boltzmann equation with the resulting Euler schemes developed as moments of the discretized Boltzmann scheme with a locally Maxwellian velocity …
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Adjoint sensitivity analysis of the two-phase two-fluid model based on an approximate Riemann solver
A new shock-capturing upwind numerical solver (i.e. forward solver) and an adjoint sensitivity analysis framework for the two-phase two-fluid model are developed and verified. Both the numerical solver and the adjoint sensitivity analysis framework are based on an analytical analysis of the …
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Techniques for compressible flow calculations on multi-zone grids
… bodies, the combined use of an implicit, upwind biased real gas scheme with 3-D fully conservative patched grid techniques is discussed. An "equivalent" gamma formulation is implemented in order to model real gas effects in Van Leer's flux vector splitting (FVS) and Roe’s flux difference …
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Representations of Reward and Movement in Drosophila Dopaminergic Neurons
… with the extent to which an animal tracks upwind towards the fictive odor source. In different experimental contexts where distinct motor actions were required to track the odor, dopaminergic neurons become emergently linked to the behavioral metric most relevant for effective olfactory …
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Decomposition of Urban CO2 Fluxes into Fossil and Biogenic Components using a novel Relaxed Eddy Accumulation System
… based on a 20 Hz vertical wind signal into an upwind and a downwind sample, allowing for the first time 14CO2-based decomposition of CO2 fluxes into fossil and biogenic components. This is prerequisite for independent eddy covariance-based top-down assessment of urban fossil fuel CO2 (ffCO2) …
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